Summary I was in need to create a planetary gears box with 5mm shaft. All the scripts I've found here, were broken someway, so I devided to take a look at the code and fix the problems for the 5mm shaft version. I used a 625ZZ ball bearing. As you can see in other photos I posted, I've used this thing to make a reduction for my Bowden MK8 Extruder, because I recently build a Rostock and it needs a lot of torque while printing fast. It works like a charm ^^.