XYZ

Installed the Y axis assembly. The cobbled-together Y motor coupling fits, provided I put the drive pulley on backwards (collar away from motor).

Ran into a problem with the Z belt. It ended up a bit loose. Rather than take it apart and redo the whole thing, I built a tension idler out of spare parts (scrap studding, washers, nuts, diagonal tie brackets, compression spring, pulley). Seems to keep things from slipping.