Terms of Service

Effective Date: August 27, 2026

Website: www.stlplayground.com

Welcome to STL Playground. These Terms of Service (“Terms”) govern your access to and use of
www.stlplayground.com and the STL Playground platform, including our parametric 3D model
builders, design tools, saved and shared designs, digital credit system, subscriptions, generated
3D files, and related services (collectively, the “Services”).

STL Playground is otherwise known as (“STL Playground,” “we,”
“us,” or “our”).

By creating an account, accessing or using the Services, purchasing credits, purchasing or
maintaining a subscription, or downloading generated files, you agree to be bound by these Terms
and our Privacy Policy. If you do not agree to these Terms, do not use the Services.

1. Eligibility and Acceptance of Terms

You must be at least 18 years old or the age of legal majority in your jurisdiction to enter into
these Terms on your own behalf. If you are under 18, you may use the Services only with the
permission and supervision of a parent or legal guardian who agrees to these Terms on your behalf.
The Services are not intended for children under 13 years of age.

If you use the Services on behalf of a company, organization, or other legal entity, you represent
that you have authority to bind that entity to these Terms.

2. Accounts and Account Security

Certain features of STL Playground, including purchasing credits, maintaining subscriptions,
saving designs, sharing designs, and downloading certain generated files, may require an account.

You agree to:

Provide accurate and current account information.
Maintain the security of your login credentials.
Not share account credentials in a manner intended to avoid licensing, subscription, or credit requirements.
Promptly notify us if you believe your account has been accessed without authorization.

You are responsible for activity occurring through your account except to the extent caused by
STL Playground or otherwise prohibited by applicable law.

3. STL Playground Services

STL Playground provides browser-based parametric design tools that allow users to customize,
generate, preview, save, share, and export 3D-printable models and related digital files. Available
export formats may include STL, 3MF, OBJ, SVG, ZIP archives, or other formats made available from
time to time.

Some builders or features may be available without charge, while others may require credits,
a particular subscription plan, or other payment.

The availability and performance of individual builders may depend on browser capabilities,
device performance, network conditions, server availability, uploaded content, model complexity,
and other technical factors.

We may improve, modify, replace, suspend, or discontinue individual builders, controls, export
formats, or features as the Platform evolves. When reasonably practical, we will attempt to avoid
changes that unnecessarily interfere with paid Services already purchased by users.

4. Digital Credits

4.1 General

STL Playground may use digital credits (“Credits”) to provide access to certain exports, downloads,
features, or other paid actions. The number of Credits required for a transaction will be displayed
within the Platform before the applicable transaction is completed.

Credits are contractual units for use within STL Playground. Credits are not currency, do not
represent stored cash value, cannot be redeemed for cash, and are not transferable between users
or accounts except where STL Playground expressly provides otherwise.

4.2 Purchased Credits

Credits purchased separately from a subscription (“Purchased Credits”) do not expire while your
account remains active and the STL Playground credit system remains operational, except as otherwise
required by law or permitted under these Terms in cases involving fraud, abuse, chargebacks, or
material violations of these Terms.

Canceling a subscription does not, by itself, cause separately Purchased Credits to expire.

4.3 Subscription Credits

Credits included as part of a paid subscription (“Subscription Credits”) are issued according to
the applicable subscription plan. Subscription Credit allowances, renewal frequency, rollover
limits, maximum accumulated balances, and other plan-specific rules are displayed on the applicable
subscription or pricing page and are incorporated into these Terms.

Subscription Credits may roll over only up to the rollover or accumulation limit applicable to
your subscription plan. Credits exceeding an applicable plan limit may not carry forward.

The treatment of unused Subscription Credits following cancellation, expiration, or downgrade of
a subscription will be governed by the plan terms disclosed for the applicable subscription.
Separately Purchased Credits are not converted into Subscription Credits solely because you
maintain a subscription.

4.4 Promotional Credits

Credits provided without payment, including promotional, trial, bonus, support, or complimentary
Credits, may be subject to separate expiration dates, usage restrictions, or other limitations.
Any such conditions will be disclosed when reasonably applicable.

4.5 Credit Usage and Export Failures

Credits may be deducted when a paid export, download, or other credit-based transaction is
successfully processed.

If STL Playground determines that Credits were deducted but the requested file was not successfully
generated because of a verified Platform error, we may automatically restore the applicable Credits
or restore them following review by our support team.

Credit restoration generally does not apply to failed physical prints, incorrect slicer settings,
printer calibration problems, material failures, user-selected dimensions or settings, unsupported
software, or other circumstances occurring after STL Playground successfully generates the
requested digital file.

4.6 Discontinuation of the Credit System

If STL Playground permanently discontinues its paid Credit system as a whole, we will make
reasonable efforts to provide affected users with advance notice and a reasonable opportunity to
use remaining Purchased Credits, or another remedy where required by applicable law.

5. Subscriptions and Automatic Renewal

5.1 Recurring Subscriptions

Certain STL Playground features may be offered through recurring paid subscriptions. The price,
billing interval, included Credits, features, storage allowances, licensing benefits, and other
material terms of a subscription will be displayed before you subscribe.

UNLESS OTHERWISE STATED AT THE TIME OF PURCHASE, PAID SUBSCRIPTIONS AUTOMATICALLY RENEW AT THE
APPLICABLE BILLING INTERVAL UNTIL CANCELED.

By purchasing an automatically renewing subscription, you authorize STL Playground and its payment
processor to charge the payment method associated with your account for recurring subscription fees,
applicable taxes, and other amounts disclosed at checkout until you cancel the subscription.

5.2 Cancellation

You may cancel an automatically renewing subscription using the cancellation method provided
through your STL Playground account or another cancellation method identified during checkout or
within your account.

Unless otherwise required by law or expressly stated for a particular plan, cancellation takes
effect at the end of the then-current paid billing period. You will generally retain access to the
subscription benefits associated with your paid period until that period ends.

We do not impose an additional cancellation fee solely for canceling a subscription.

5.3 Renewal Notices

Where required by applicable law, STL Playground will provide advance notice of an upcoming
automatic renewal, including applicable information regarding the renewal date, price changes,
and how to cancel.

5.4 Subscription Price Changes

We may change subscription pricing or plan features from time to time. Price changes will not
retroactively increase the price of a billing period that has already been paid.

When required by law, or when a change materially affects an automatically renewing subscription,
we will provide advance notice before the changed price or material term applies to a future renewal.
You may cancel your subscription before the new terms take effect.

5.5 Failed Payments

If a recurring payment cannot be completed, we may retry the payment, request an updated payment
method, temporarily restrict subscription benefits, or allow the subscription to expire or be
canceled.

6. Payments, Refunds, and Taxes

Payments may be processed by third-party payment processors. Your use of those payment services
may also be subject to the processor’s applicable terms and privacy practices.

Except where required by law or expressly stated otherwise, purchases of Credits, subscriptions,
and successfully delivered digital products are non-refundable.

We may provide a refund, account adjustment, or Credit restoration when appropriate for circumstances
such as duplicate billing, unauthorized transactions, verified Platform errors, or other situations
we determine warrant correction.

Credits consumed for a successfully generated digital file are generally not refundable merely
because a user’s subsequent physical print fails or does not produce the desired result.

You are responsible for applicable sales, use, value-added, or similar taxes associated with your
purchase unless those taxes are collected and remitted by STL Playground or its payment processor.

7. Saved Designs, Shared Designs, Storage, and Retention

STL Playground may allow users to save design configurations, preview images, uploaded assets,
design parameters, generated metadata, and other information associated with a design.

Storage quotas, maximum numbers of saved designs, retention periods, sharing features, and related
limits may vary based on account type or subscription plan. Applicable limits may be displayed on
our pricing pages, within your account, or elsewhere in the Platform.

If you cancel or downgrade a subscription, your new plan may provide less storage or shorter
retention than your previous plan. In such circumstances, STL Playground may restrict creation of
additional saved designs, place certain stored content into a limited-access state, or remove
content after the applicable retention period.

Where reasonably practical, we may provide notice or an opportunity to retrieve affected content
before deletion when stored content is being removed because of a plan downgrade, cancellation,
storage limit, or material change in retention policy.

Saved Designs are provided as a convenience and should not be treated as a permanent backup
service. You are responsible for maintaining copies of exported files that are important to you.

Shared design links may stop functioning if the underlying design is deleted, the applicable
retention period ends, the user’s account is terminated, sharing is disabled, or the associated
builder is no longer available.

Anyone who receives a share link may be able to access the content associated with that link.
Do not use shared links for information or content that you consider confidential or sensitive.

8. User Content and Uploaded Assets

8.1 Ownership

You retain ownership of original artwork, SVG files, images, logos, text, graphics, design inputs,
and other content that you upload or submit to STL Playground (“User Content”), subject to any
rights owned by third parties.

8.2 Limited License to STL Playground

By uploading or submitting User Content, you grant STL Playground a non-exclusive, worldwide,
royalty-free license to host, store, copy, process, convert, render, display, and otherwise use
that User Content only as reasonably necessary to:

Provide the Services you request.
Generate previews and 3D models.
Save your design configurations and assets.
Provide sharing features that you choose to use.
Maintain, secure, troubleshoot, and improve operation of the Platform.
Comply with legal obligations and enforce these Terms.

This license does not transfer ownership of your User Content to STL Playground.

8.3 Your Responsibility for Uploaded Content

You represent and warrant that you own or otherwise have sufficient rights and permissions to
upload, process, reproduce, and use the User Content you submit through STL Playground.

You may not knowingly upload or use User Content in a manner that infringes another person’s
copyright, trademark, privacy, publicity, contractual, or other legal rights.

STL Playground’s ability to technically process an image, logo, character, trademark, graphic,
or other asset does not mean that you have legal permission to use that material.

9. STL Playground Intellectual Property

Except for User Content and third-party materials, STL Playground and its licensors retain all
rights, title, and interest in the original content and technology comprising the Platform,
including our original source code, builder implementations, user interfaces, designs, graphics,
documentation, branding, databases, workflows, and copyrightable software expression.

The Platform may incorporate open-source software, third-party libraries, fonts, graphics,
frameworks, APIs, and other materials that remain subject to their respective licenses and
ownership rights.

Nothing in these Terms transfers ownership of STL Playground’s software, Platform technology,
branding, or other intellectual property to you.

10. Generated 3D Models and Licensing

10.1 License Associated With an Export

A generated 3D file may be subject to a Personal License, Commercial License, or another license
identified by STL Playground at the time the file is generated or downloaded.

The license applicable to a successfully acquired file is determined by the license status shown
for that transaction at the time of acquisition.

Subject to your continued compliance with these Terms, canceling or changing a subscription does
not retroactively revoke a valid license previously granted for a file that was legitimately
acquired while the applicable license was active.

Upgrading to a Commercial subscription does not automatically convert previously acquired
Personal License files into Commercial License files unless STL Playground expressly provides
such an upgrade or the file is subsequently acquired under the Commercial License.

10.2 Personal License

Unless otherwise stated for a particular model, a Personal License grants you a non-exclusive,
non-transferable license to:

Use the generated digital file for your own personal, non-commercial purposes.
Modify the generated file for your own personal, non-commercial purposes.
Produce physical 3D prints for your own use.
Give physical prints as personal gifts, provided you do not receive payment or other commercial compensation.
Display photographs, screenshots, renders, or videos of your physical prints or designs.

Under a Personal License, you may not:

Sell physical products produced from the generated file.
Use the generated model as part of a commercial product or paid service.
Sell, distribute, sublicense, or otherwise provide the generated digital file to another person.
Upload the generated digital file to a model-sharing website, repository, marketplace, file-sharing service, or similar platform.

10.3 Commercial License

Unless otherwise stated for a particular model, a Commercial License grants you a non-exclusive
license to:

Use the generated file for personal or commercial purposes.
Modify the generated file for purposes permitted by the Commercial License.
Produce physical 3D prints from the generated design.
Sell physical 3D prints and physical products produced from the generated design.
Display photographs, renders, videos, and other visual representations of those physical products for marketing and sales purposes.

A Commercial License does not permit you to sell, redistribute, sublicense,
share, publish, or upload the underlying digital model file.

This restriction applies to STL, 3MF, OBJ, STEP, SVG, and other generated digital geometry files,
as applicable, as well as modified, converted, remeshed, or derivative digital files whose primary
purpose is to reproduce substantially the same STL Playground-generated geometry.

10.4 No Digital File Redistribution

Unless STL Playground expressly provides a separate license authorizing redistribution, generated
digital files may not be uploaded, shared, distributed, or sold through third-party repositories,
marketplaces, file-sharing services, model-sharing platforms, or similar services.

Examples include, without limitation, selling or distributing generated model files through
digital marketplaces or uploading them for public download through 3D model repositories.

10.5 Third-Party Intellectual Property Is Not Licensed

A Personal License or Commercial License from STL Playground applies only to rights that STL
Playground is legally able to grant.

STL Playground does not grant you any license to third-party copyrights, trademarks, characters,
logos, artwork, brands, fonts, or other intellectual property that you choose to incorporate into
a design.

For example, generating a model containing a third-party company logo does not give you permission
to sell products bearing that logo merely because the model was generated while you held a
Commercial License.

You are solely responsible for determining whether additional licenses, permissions, or approvals
are required for third-party content incorporated into your designs.

11. Prohibited Activities

You agree not to:

Use the Platform for unlawful, fraudulent, deceptive, or abusive activity.
Attempt to bypass, manipulate, or defeat Credit requirements, subscription restrictions, licensing controls, download controls, or other access restrictions.
Exploit bugs, vulnerabilities, or unintended Platform behavior to obtain unauthorized Credits, exports, downloads, access, or other benefits.
Use automated scripts, bots, scrapers, crawlers, or similar systems to harvest models, systematically extract Platform content, or place unreasonable load on the Services.
Reverse engineer, decompile, disassemble, or attempt to derive non-public source code or proprietary implementation details from the Services, except to the extent such restrictions are prohibited by applicable law.
Interfere with the security, integrity, operation, or availability of the Platform.
Attempt to access another user’s account without authorization.
Upload malware, malicious scripts, or other harmful code.
Use the Services to knowingly infringe copyrights, trademarks, privacy rights, publicity rights, or other third-party rights.
Misrepresent the source, ownership, or licensing status of generated STL Playground files.
Resell or redistribute generated digital files except where a separate written license from STL Playground expressly permits it.

12. Account Suspension and Termination

We may suspend, restrict, or terminate access to the Services when we reasonably believe an account
has engaged in fraud, payment abuse, unauthorized chargebacks, security attacks, automated abuse,
Credit exploitation, intellectual property infringement, prohibited redistribution, or other
material violations of these Terms.

Where appropriate and reasonably practical, we may provide notice and an opportunity to correct
a violation before permanent termination. We may act immediately when necessary to protect users,
STL Playground, payment systems, third parties, or the security and operation of the Platform.

If an account is terminated because of fraud, abuse, or a material violation of these Terms, access
to unused Credits or stored content may be restricted or forfeited to the extent permitted by
applicable law.

Termination does not eliminate obligations or liabilities that arose before termination.
Provisions concerning intellectual property, licensing restrictions, disclaimers, limitations of
liability, indemnification, and dispute provisions survive termination where applicable.

13. Copyright and Intellectual Property Complaints

STL Playground respects the intellectual property rights of others. If you believe content available
through STL Playground infringes your copyright or other intellectual property rights, please
contact us at support@stlplayground.com with sufficient information to identify:

The copyrighted or protected work you believe has been infringed.
The allegedly infringing material.
Where the material appears on STL Playground.
Your contact information.
The basis for your claim.

We may remove or restrict access to allegedly infringing content and may suspend or terminate
accounts associated with repeated or serious infringement where appropriate.

14. Platform Changes and Availability

STL Playground is an evolving software platform. We may add, remove, modify, redesign, or replace
builders, controls, algorithms, user interfaces, file formats, features, Credit costs, storage
limits, subscription plans, and other aspects of the Services.

We do not guarantee that every builder, feature, or file format will remain available indefinitely.

Changes to Credit prices or subscription terms do not retroactively alter completed transactions
or revoke valid licenses already granted for legitimately acquired generated files.

We may temporarily suspend access to some or all Services for maintenance, security, upgrades,
technical failures, or circumstances outside our reasonable control.

15. 3D Printing and Manufacturing Disclaimer

STL Playground generates digital geometry based on user-selected inputs and is not a professional
engineering, manufacturing, product-certification, or safety-testing service.

Generated files may require adjustment based on your printer, slicer, filament or resin, material
properties, calibration, orientation, supports, tolerances, environmental conditions, and intended
use.

You are responsible for evaluating whether a generated design is appropriate and safe for your
intended application.

STL Playground does not certify generated models for structural, load-bearing, medical, food-contact,
electrical, automotive, aerospace, child-safety, life-safety, heat-resistant, pressure-containing,
or other safety-critical applications.

You assume responsibility for material selection, printer operation, slicer configuration,
dimensional tolerances, physical testing, regulatory compliance, and the safety of objects you
manufacture using generated files.

16. Disclaimer of Warranties

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE SERVICES, BUILDERS, GENERATED FILES, SAVED
DESIGNS, SHARED DESIGNS, AND OTHER PLATFORM CONTENT ARE PROVIDED ON AN “AS IS” AND “AS AVAILABLE”
BASIS WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR STATUTORY.

TO THE MAXIMUM EXTENT PERMITTED BY LAW, STL PLAYGROUND DISCLAIMS IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT.

We do not warrant that the Services will be uninterrupted, error-free, permanently available, or
compatible with every device, browser, printer, slicer, material, or manufacturing process.

We do not guarantee that a generated model will print successfully, meet a particular tolerance,
perform a particular function, or be suitable for a particular application.

17. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, STL PLAYGROUND AND ITS OWNERS, OFFICERS,
EMPLOYEES, CONTRACTORS, AFFILIATES, LICENSORS, AND SERVICE PROVIDERS WILL NOT BE LIABLE FOR ANY
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF
PROFITS, REVENUE, DATA, BUSINESS OPPORTUNITY, GOODWILL, OR USE, ARISING FROM OR RELATED TO YOUR
USE OF OR INABILITY TO USE THE SERVICES.

This includes, without limitation, losses associated with failed prints, wasted materials,
printer damage, manufacturing problems, use of generated designs, inaccessible saved content,
service interruptions, or third-party intellectual property claims arising from User Content.

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, STL PLAYGROUND’S TOTAL AGGREGATE LIABILITY
ARISING OUT OF OR RELATING TO THE SERVICES OR THESE TERMS WILL NOT EXCEED THE GREATER OF
US $100 OR THE TOTAL AMOUNT YOU PAID TO STL PLAYGROUND DURING THE 12 MONTHS IMMEDIATELY PRECEDING
THE EVENT GIVING RISE TO THE CLAIM.

Some jurisdictions do not permit certain warranty exclusions or liability limitations. In those
jurisdictions, these provisions apply only to the maximum extent permitted by law.

18. Indemnification

To the extent permitted by applicable law, you agree to defend, indemnify, and hold harmless
STL Playground and its owners, officers, employees, contractors, and affiliates from claims,
damages, liabilities, losses, and reasonable costs arising from or related to:

Your material violation of these Terms.
Your unlawful use of the Services.
User Content that you upload or submit.
Your infringement or alleged infringement of third-party intellectual property or other legal rights.
Your sale, distribution, manufacture, or use of physical products produced from generated files.

This provision does not require you to indemnify STL Playground for claims caused solely by
STL Playground’s own unlawful conduct where such indemnification would be prohibited by law.

19. Privacy

Our collection, use, storage, and disclosure of personal information is governed by the
STL Playground Privacy Policy, which is incorporated into these Terms by reference.

Payment card information may be collected and processed directly by third-party payment processors
rather than stored directly by STL Playground.

20. Governing Law and Venue

These Terms and any dispute arising from or relating to these Terms or the Services will be governed
by the laws of the State of North Carolina, United States, without regard to conflict-of-law
principles, except where applicable law requires otherwise.

Subject to any rights that cannot legally be waived, you agree that disputes arising from or
relating to these Terms or the Services will be brought in the applicable state or federal courts
located in Mecklenburg County, North Carolina, and you consent to the personal jurisdiction
of those courts.

21. Changes to These Terms

We may update these Terms as the Services, laws, or business practices change.

When we make material changes, we may provide notice through the Platform, by email, during account
login, or through another reasonable method. When legally required or otherwise appropriate, we
may ask you to affirmatively accept revised Terms before continuing to use affected paid Services.

The Effective Date at the top of these Terms identifies the date of the current version.

Changes to these Terms will not retroactively revoke a valid Personal or Commercial License
previously granted for a generated file that was legitimately acquired under the Terms in effect
at the time of acquisition, except where necessary to address fraud, infringement, illegality,
or other circumstances where continued licensing would violate applicable law.

22. Miscellaneous

22.1 Entire Agreement

These Terms, together with the Privacy Policy, applicable plan terms, checkout disclosures, and
any additional terms expressly presented for a particular Service, constitute the agreement between
you and STL Playground regarding your use of the Services.

22.2 Severability

If any provision of these Terms is found to be invalid or unenforceable, the remaining provisions
will remain in effect to the fullest extent permitted by law.

22.3 No Waiver

Our failure to enforce a provision of these Terms does not waive our right to enforce that provision
or any other provision in the future.

22.4 Assignment

You may not assign or transfer your rights under these Terms without our prior written consent.
We may assign these Terms in connection with a merger, acquisition, corporate reorganization,
sale of assets, or transfer of the STL Playground business, subject to applicable law.

22.5 Section Headings

Section headings are provided for convenience and do not affect the interpretation of these Terms.

23. Contact Us

If you have questions regarding these Terms, billing, Credits, subscriptions, generated-model
licensing, or other STL Playground policies, please contact:

STL Playground
Email: support@stlplayground.com
Website: www.stlplayground.com