knurled nuts Z coupler 8 - 5 mm
thingiverse
I altered a fantastic design by changing the 5 and 8 millimeter nuts to knurled versions, which I find easier to use and tighten firmly without needing an Allen wrench. The original design works perfectly for my i3 spinoff, providing better alignment than commercially available aluminum couplers. Use the v2.5 5-8mm coupler from the original design at https://www.thingiverse.com/download:2463007
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