Summary

These finger knob use an inserted M3 nut to replace the supplied wing nut on many 3d printers. Having had issues with fit before, i generally print a sample in a small flat square to test the size of the hole before proceeding with the final print. I have made a sample block with 4 sizes, 5.5, 5,55, 5.6 and 5.65 mm. Print the sample card to determine which knob to print.