I needed a new fish feeder after my last homemade (extremely rigged) one broke. This particular wheel has 16 holes to drop food into and I will be adding more inner wheel types soon.Print and put together. Any motor can be used but I used a stolen Lego motor from my sis (she won't notice) out of her eggbot. There is a cross shape for the axel hole so you can use a square axel or grind one down into a cross, no set screw needed. I also recommend using some sandpaper and acetone to smooth out the working surfaces since with my parameters it was still a tight fit.