Oh and when you're printing a test holder for cupped magnets and it's a great super tight fit first go - make sure you can get the bloody thing out again ;-)
Currently dismantling the holder with a knife. MKII with hole in the base to push the magnet out, is printing lol

had to melt the bugger out. Second one works perfectly, pushes out easily.

Just need wheels and threaded ball bearings and I can start on the shafts and carriages.
Dab of glue and those suckers are never coming out :-)