Very snug fit on the parts - I found a rubber mallet handy for getting the bearings in and the feet attached. I used the slicer to extend the rail to 25 cm long, and the feet to 2.5 cm high, and converted a kitty litter tub into a filament-feeding dry box. If it wasn't for the humps in the bottom of the tub (the reason for the extended feet), I could get three spools in, but I guess we must make sacrifices when we go cheap.