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Pulleys....
Lars,
Thingiverse has several different parametric pulley designs into which you enter the desired properties (teeth, teeth profile GT2 etc, centre hole size etc) and out will pop a pretty good file which can be directly imported into a slicer for printing. This allows very large teeth count pulleys to be made, if your printer is large enough.
I have been experimenting with such things to motorise an alt-az mount but have to divide them up into multiple segments as my printer isn't too big. To save plastic, I use a very large centre hole and pin the segments to MDF for actual use.
Good luck.
Nick
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