Prints well with my i3mk3s, but be prepared to do a few attempts at the gears to get a perfect fit. I will post the BOM later, but it's included as the names of parts in the .stp. Prices of the parts will vary a lot, denpending where you buy. The places I was buying from are all in Polnad so won't probably be relevant for most of You.
I'm pretty sure you'll need to modify the way it's mounted for you won design. I just left some 'suggestions' for hole placements, feel free to delete these. I'm uploading a .stp and an .f3d.
I've developed this reducer to be used in my Atlas robot arm.