The Taz 5 is in the shop for repair.  It seems to have some mechanical resistance in Z about an inch above the build plate.  I moved it back and forth a few times and added some grease to the threaded rods and it seems to move smoothly again.  I was able to auto-home 15 times without it stalling like it did on my first few tries.  I also updated the firmware in the Taz 5 with the latest code from Lulzbot for the Taz 5.  It is now possible to move negative amounts through the control panel and connect via USB.  I have more testing to do before I bring it back but I have my fingers crossed that all will be fine.

The Taz 3 has filament stuck in the hot end.  There is not enough hanging out to pull it out from the top (let alone let the hobbed bolt move it) and heat cycles do not let it drip out.  I need to take the hot end apart to get it cleared out.  I hope to work on this Wednesday.