- Free for personal use.
- Free for educators to print as many as needed for their class.
- Uploading our STL download files labeled PREMIUM to any site is PROHIBITED. We will have regular updates for these, and need to maintain dimension control for compatibility.
- Uploading our STL download files labeled FREE is ok. Removing the Cattern.com name from our .stl files is not allowed.
- 50 cent royalty for every PREMIUM file printed for commercial use or resale, unless for an educational institution.
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