Here are some gearboxes I made as a proof of concept.
The first one is a 10:1 (ie 10 turns of the crank = 1 turn of the arrow).
The output turns in the opposite direction of the input.
This one is a single stage... the crank turns an eccentric, which rolls the gear around the pins
(semi circular teeth machined into the gear case).
The output is then transmitted via holes in the gear to a disc with pins that sit in these holes.
If you tick the 'Output layer' option in the plugin and animate hopefully that makes sense.
The second one is a 100:1 (ie 100 turns of the crank = 1 turn of the arrow).
The output turns in the same direction of the input.
This one is 2 stage... A 10 tooth gear rolls around 11 pins like the 10 turn gear.
A second 9 tooth gear is fixed to the first. This one rolls around 10 pins machined into a disk which forms the output.
I find it quite amazing how compact the 100:1 gearbox is.
I always thought these would make a good winch (you can't backdrive hypocycloidal gearboxes).
I have attached the CamBam file used to machine both of these gearboxes... it's a bit of a mess though!

Both gearboxes were made from 4mm (clear) and 5mm (orange) acrylic.