M3x4 thread insert calibration
thingiverse
Use this to check what size you should make your holes when using 4mm thread inserts. Just print it, place an insert in each hole and see which one you like the most, for my type of insert it was 3.75 mm.
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With this file you will be able to print M3x4 thread insert calibration with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on M3x4 thread insert calibration.