I wanted to get at least one satisfying output out of this thing before I tear it down and figure out what’s not rigid enough for routing in the middle-Z territory. So I added a little more squash and finally got the PLA to make a nice stick to the PrintinZ build board, and now it’s happily printing off a little drag-chain mount I drew. Whee! And it looks like it’s doing a decent job.
Tomorrow, surgery to go looking for the loose fit. Thanks vicious1 for the pointer.