86 Tooth GT2 pulley knob
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86T pulley for GT2 belt is a snug fit over the knob on one specific 4" rotary table (ebay item 170729688086). This particular table boasts a robust 72:1 reduction worm drive. It might be advantageous to have designed this with an 85-tooth configuration, paired with a 17-tooth driver on the stepper shaft pulley. That would yield a 5:1 reduction or an overall 5*72 = 360, making one full turn of the stepper shaft precisely 1 degree on the rotary table. This pulley body is hollow to accommodate the handle, so flip the .STL file by 180 degrees before printing to circumvent an overhang issue. The source OpenSCAD file is included (though note, this one takes a considerable amount of time to render, 8 minutes on my PC). It is derived from "drofarts" parametric pulley file, thing:16627 UPDATE: An 85-tooth version has been added (that is the "bronze" color version in photos). The wall thickness ranges from 1.0 to 1.8 mm across the toothed part, and it appears to work so far. It's in motion here:
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