01Terms of Service
These terms govern your use of 3D Channel Letters (the “Software”), a desktop application for macOS and Windows that generates 3D-printable STL files from DXF vector input for the production of illuminated channel letters. By downloading, installing, or using the Software, you agree to these terms.
Provider
The Software is developed and provided by Miloš Kráľ, an individual sole developer based in the Slovak Republic, European Union.
What the Software does
The Software imports a DXF vector file, generates a 3D model of an illuminated channel letter according to the parameters you set (wall thickness, box depth, acrylic rebate or solid front, back type, colours) and exports STL files — Wall, Back (optional) and STL per object — that are ready to slice and print on a standard FDM 3D printer.
Free of charge
The Software is free of charge. All features, including STL export, are available to everyone — no license key, trial period or subscription.
Voluntary donations
You can support development with a voluntary donation of any amount via PayPal (@miloskral1) or Revolut (@milosl11f). Donations are gifts: they are not a purchase, do not create a subscription and do not unlock any additional features.
No hidden costs
Nothing to pay, nothing to cancel. There is no recurring charge, no stored payment method and no premium tier. Using the Software never requires a payment.
Acceptable use
You may use the Software for personal or commercial work, including producing STL files for client projects and selling the printed letters. You may not:
- Sell, rent, redistribute or sublicense the Software itself
- Distribute modified or tampered copies of the Software
- Use the Software to produce content that is illegal in your jurisdiction
Ownership of STL output
All STL files generated by the Software belong to you. You may use, print, sell, and distribute the resulting letters and signage without any royalty, attribution, or further permission from the developer.
Warranty & liability
The Software is provided “as is”, free of charge and without warranty of any kind, express or implied. You are responsible for verifying STL output before printing or production. To the maximum extent permitted by law, the developer is not liable for material costs, printer wear, lost production time, lost client work, or any indirect, incidental, or consequential damages arising from the use of the Software.
Changes to these terms
These terms may be updated to reflect changes to the Software or applicable law. The current version is always published on this page with the “Last updated” date shown above. Continued use of the Software after a change takes effect means you accept the revised terms.
Governing law & jurisdiction
These terms are governed by the laws of the Slovak Republic. Any disputes arising from or related to the Software will be resolved by the competent courts of the Slovak Republic, without prejudice to mandatory consumer protection rights you may have under the law of your country of residence within the European Union.
02Donations
Everything is free. Donations are optional and simply help keep development going.
How donations work
Any amount, any time. Use the PayPal or Revolut button in the
Support section. There is no minimum and no recurring charge, and you don't need to send a Hardware ID, a screenshot or an email.
What a donation is — and isn't
A donation is a voluntary gift to the developer. It is not a purchase of goods or services and does not create a subscription, a license or any entitlement to support, features or updates beyond what every user gets.
Every feature of the Software and the LumiSign3D web apps stays free whether you donate or not.
Refunds
Donations are non-refundable, with one exception: if you donated by mistake or paid twice, email kralmilos@gmail.com within 30 days with the transaction details and the amount will be returned in full.
03License Terms
What you may do with the Software — free of charge.
Grant of license
You are granted a free, non-exclusive, non-transferable, revocable license to install and use the Software for personal or commercial purposes.
No license key
The Software needs no license key, Hardware ID or activation. Install it on as many of your own computers as you need.
Works offline
The Software:
- Does not require an account, login, or registration
- Does not “phone home” or contact any server
- Works fully offline, including on air-gapped production computers
- Does not transmit any data anywhere
Restrictions
You may not:
- Sell, lease, or redistribute the Software, or present it as your own
- Distribute modified or tampered copies
- Modify, reverse-engineer, decompile, or disassemble the Software
- Remove or alter any copyright or trademark notices
Termination
The license terminates automatically if you breach these terms. On termination you must stop using the Software and delete it from your machine.
Updates
Updates are free. The developer may change, extend or discontinue the Software or any web app at any time; any change to the free model will be announced on this page in advance.
App signing & integrity
The macOS build is Apple-signed and notarized. Always download the Software from www.lumisign3d.com — versions distributed elsewhere are unauthorized and may be tampered with.
LumiSign3D web apps
The same terms apply to LumiSign NEON and all other LumiSign3D web apps — all free of charge.
04Privacy Policy
The shortest privacy policy you’ll read this year, because almost nothing is collected.
What the Software collects
Nothing. The desktop Software does not collect, transmit, or store any personal data, telemetry, usage analytics, or crash reports. It runs entirely on your machine and does not make any network requests.
What this website collects
This website (www.lumisign3d.com) is a static page. It does not use cookies, analytics scripts, tracking pixels, or third-party advertising networks. Standard server access logs (IP address, user-agent, page requested, timestamp) may be kept by the hosting provider for a short period for security and abuse prevention purposes — these are not used for tracking or profiling.
What I receive when you donate or email me
If you donate or contact me, I may receive the following — used only to reply to you and keep basic records:
- Your email address — if you write to me, to respond to your message
- Donation details — the information PayPal or Revolut shows me (sender name, amount, message)
This information is stored in a private spreadsheet and email inbox. It is never shared, sold, or transferred to any third party, except where strictly required by law.
Payment data
Donations are processed by PayPal and Revolut as independent payment providers. I receive only the information they choose to display about the transaction (sender name, amount, transaction ID, message). I do not see or store your card number, bank account details, or any other financial credentials. Their respective privacy policies apply to the payment itself.
Your rights (GDPR)
If you are in the European Union, you have the right under the General Data Protection Regulation (GDPR) to:
- Request a copy of the personal data I hold about you
- Request correction of inaccurate data
- Request deletion of your data (right to be forgotten)
- Object to processing or request restriction
- Lodge a complaint with your national data protection authority — in Slovakia, that is the Úrad na ochranu osobných údajov SR
To exercise any of these rights, email kralmilos@gmail.com. Requests are answered within 30 days.
Data retention
Emails are kept only as long as needed to handle your request. Donation records are kept for the period required by Slovak accounting and tax law. After that, the data is deleted.
Changes to this policy
If this privacy policy changes, the “Last updated” date at the top of this section will reflect the new version.
