Mini: Unclogged head with some heat plus extrude/retract cycles.  Tossed the crappy pink filament and it printed a test print fine using new filament.  

Mini #2:  Printed a test print fine.

Prusa:   Printed test print fine.  Found a blob of white filament stuck to the print head.  Lucky for me, I added the blue rubber hat to the head so it came off pretty easily so it looks like new again.  I rebuilt this head a few weeks ago.  

Taz 3:   Broken.

Bed leveling is very flakey resulting in some prints working and some failing.  Noticed the threaded rods are dirty and need fresh grease.  Also, the linear bearings for the bed seem to be shot as they have a great deal of play.  I brought the machine home, cleaned the threaded rods and regreased.  Seems better but still crappy.  I ordered new bearings now that I figured out how to remove them.  

Taz 5:   Printed a test print fine.