Nothing is more discouraging than waiting over an hour for your beloved part to print and at the last minute… it FAILS!  I haven’t been able to figure out what is happening, but it appears to be consistent… the layers become misaligned and ruin the part.  Some of these are usable, but who wants to build a less than perfect Prusa remix Mendel RepRap?!

UPDATE: this apparently was caused by a misaligned Z platform and a steep temperature drop in Northern California (my un-heated garage)… both added up to failures.