knurled nuts Z coupler 8 - 5 mm
cults3d
https://www.thingiverse.com/thing:602481 Took this great design and altered the 5 and 8 mm nuts to a knurled versio, which I find works a bit easier and you're able to tighten them more then suffucuent without a spanner. The original design works great for my I3 spinoff, much better alignment then the alu couplers commercially available ! Use the v2.5 5-8mm coupler from the original design https://www.thingiverse.com/download:2463007
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