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Small and Simple M3 tolerance tester
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Very simple print for checking tolerances on M3 hardware
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- Source
- Printables
- Category
- Test Models
- License
- Creative Commons — Attribution
I made this to check tolerances on M3 hardware on a prusa mk4, but will work with anything. The initial dimensions are:
Nut, 5.95mm (measured corner to corner)
Bolt head, 5.30mm
Shaft, 2.95mm
Each dimension increases by 0.05mm as you move to the right. Just print one and poke around and see what fits best. The ideal fit for a bolt head might not be on the same slot as the best fit for threads, etc so play around with it. Here is an image with all the dimensions

The inner circle diameter of each hexagon is the same as the inner circle below it
