Peristaltic pump 15 sun gears 3 planets, 10 gears, 70mm diameter

So, the good news is that I can now get the pumps to print reliably. Complex parts of the print kept jamming my extruder. Printing at dead slow speed for the shells (13mm/s or less) finally resolved this. To prevent slumping, the openSCAD code had to be set to prevent overhangs, and despite the resulting layer of phantom mesh which others have already remarked on, it still prints. However even with larger teeth and cogs, it still tends to make a meal of actually turning with the tygon in place a