NEMA17 5x8 Oldham coupler

thingiverse

5x8 Oldham coupler for NEMA17 steppers on 8mm lead screws. Length 35mm, diameter 20mm (commercially available ones are 33x20mm). There is surprisingly very little play, and the assembly slides smoothly. Some action : https://www.youtube.com/watch?v=nWa5ihTXM7E Print at 0.2mm with no additional brim or supports (required supports are part of the STL) : https://youtu.be/RKpWhwiRadc ** NEW : a short 26mm version.** But it hasn't been tested. ** NEW : a 10mm rod version.** Not tested either *BOM :* - 4 M3x12mm bolts and assorted nuts - Lithium grease, or any kind of fluid but thick grease *Post print :* - Grind the parts by sliding them against one an other. And as the assembly will take an affinity in a specific layout, trace a mounting mark with a soft-tip pen. - Top/bottom orientation of the central part can be identfied by the direction of the surface lines inside de slits : oblique on the top side, straight under the *bridge* . - Cut the 8mm clamp(s) away from its(their) support grid, don't bother removing the grid as it helps keeping the collet straight against the assembly. - Apply a generous amount of grease on the sufaces and slits before use. - Leave a slight play (less than 1mm). Adjustment can be made by sliding either side. **As a matter of fact, it won't be able to hold any weight and has to be used with bearings / thrust bearings** **For the Tevo Tarantula see this for the Z axis** : https://www.thingiverse.com/thing:2379659 as well as this spacer printed with a 10mm thickness : https://www.thingiverse.com/thing:26126