made a complete redesign with this Remix. Goal was to excange the printed and fast breaking clips with a (metric) Screw to fix the wheels to the base. You Need one M3x8mm Screw for every gear.

gear design is "very close" to metric gears with modul 1.

i´ve printed the first ones with 0.5mm nozzle, should better be done with a 0.25mm nozzle...

will upload a few more bases soon... :)

Thanks to Umake for the Inspiration!

UPDATE

added a upside-down Version of the gears to get the glossy side up when printing abs directly on glass. this ones have the hole closed with a 0.5mm thin wall to make em printable without support. the wall needs to get drilled after printing...
added:
base for Z20-Z40
two Z40 gears with one or two grooves
Z20, Z30 and Z40 gears with a knob (thanks to Bobovich)
‘halter_five_4xZ14_1xZ20.stl’

added:
triple_opend_Z20-30-40_complete
duo_opend_Z20-40_complete.stl
duo_opend_Z14-20_complete.stl
five_opend_4xZ14_1xZ20.stl

PLZ add pics if you made one. :)