Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
@fcwilt the standard 8mm from open builds.
I had a stepper motor with gearbox never thought to use that.
@fcwilt I have the flexible z couplers.