File preparation guide
How to Prepare a 3D Printing File
A short checklist for sending a useful file—plus what to do when all you have is a photo, sketch, or broken object.
Short answer
The practical answer
Send the model in STL, 3MF, OBJ, or STEP format when possible, confirm the intended units and finished size, identify critical dimensions, and explain what the part must do. The model should be closed and printable, but you can still request a review when you are unsure.
Before uploading
A few details prevent avoidable scale and version mistakes.
- Use a clear file name and version
- State whether dimensions are inches or millimeters
- Include the finished size
- Call out fit-critical measurements
- Explain quantity, use, and deadline
- Include assembly notes for multi-part models
File types we accept
STL, 3MF, OBJ, and STEP are common 3D formats. ZIP can group related files. PNG, JPG, JPEG, and PDF are accepted as references for modeling requests.
No printable file yet
Send clear photos from several angles, a ruler or known object for scale, a sketch, and the most important dimensions. We will tell you whether custom modeling is practical.
Reviewed by Brandon, Founder, First Matter LLC · Operated by First Matter LLC · Published · Updated