M4 Thumb Nut (with through hole) - Ender 3 Bed Levelling
thingiverse
Who doesn't love a great Thumb Nut? 20mm total height with through hole, ensuring it never bottoms out. Ready to glue in a standard M4 nut. Check your print widths if you don't want too tight a fitting. I print thread ends up, in PLA, with 20% infill. These also work as excellent bed levelling nuts for the Ender 3. Combined with upgraded springs, you'll never have to worry about knocking those massive wheels again! Be aware that these only leave 14mm of usable space between the electronics cover below. My Thingiverse laser cut fan duct fits perfectly, but you may need to modify your duct height... or more easily still, use your slicer software to lower the thumb nut a few millimeters below the on-screen bed level and reduce the part height.
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