Summary

Just some quick pullies I threw together to take up the slack in my Maslow (the sprockets kept jamming for me)

Press in a 608 bearing into the runner (made a larger diameter so the chain is less likely to bind) and insert the shaft and make a filament codder pin and you're good to go.

prints with no supports and things are oriented for max strength.
If you want to put an infill modifier on the pin and set it to 90% for extra confidence. but since these parts aren't load-bearing no point in using hardware.