Speed Increase Gear Box 3D print model

I want to see how gear ratios affect the speed of an object, so I created a gearbox with a 2.5:1 gear ratio per stage in this model. In my model, I have 4 stages pairing a 25-tooth spur gear with a 10-tooth spur gear per stage, making the speed go faster each stage. This file will also include a BOM to know the quantity of the parts, and also an assembly file in pdf format with exploded view as well.