Functional Differential Gear System
by RonG, published
I was having trouble getting the smaller gears to print because of the overhang. I used OpenSCAD to fill in the bottom of the hole on each gear so that there was a clean bridge. I left enough of the hole to act as a guide for the drill. The scad files are created demonstrating how to do this.
The import feature in OpenSCAD provides a convenient way to make simple additions and deletions to an existing part if the only thing you have is the STL file.
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Print the v2 versions of the gears, then use a 3mm drill (ideally held in a pin vice) to clean out the hole.