Modular planetary gearbox where each segment makes x10, so 1 segment makes 10:1, 2 segments 100:1 and three segments 1000:1. Among the images is an exploded view showing an example of a 1000:1 assembly. The cover picture shows the 10:1 assembly without the cover. The holes on the case are made for M5 screws, but it can also be attached in other ways.

recommended print settings:

-wall loops = 5

-top shell layers = 5

-bottom shell layers = 5

-infill density = 15

-infill pattern = Gyroid

-support = on