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What I write now
apsoluut is not meant negatively !!!
(I'm afraid that it gets misunderstood) therefore.....
It looks really good!!!

but wonder if this design perhaps what could be more universal?
the circle around the motor A bit wider,
Screw houses as a trench so your engine can go Slightly back and forth
so that he be able to slide back and forth (for example if you have a larger or smaller gear)

Also, the space between the gear and the holes is large.(where the filament passing through it)
maybe is it possible to have less room there?

not right now but I will also try to print this design.
maybe there are still come some adjustments? ;-)

myself I am still a beginner I have two printers self-made.
the software and my English are the biggest problem! step-by-step......... you know how it goes :-)

I wish you all the best!
Regards from the Netherlands.