Mini Blob Of Doom ...
Here's a stumper, most definitely from the WTF Department.
This weekend I've been working on an electromechanical project for the model railroad, using two printers, the Ultimaker for black and the Prusa for gray. I've been doing smaller parts all evening, and all have been printing flawlessly as expected.
When a gray piece on the Prusa finished, I cleaned off the plate, brushed off the nozzle area, and started a small cable guide clip for a flat cable on the accessory I am modifying. As I usually do I watched as the priming strip and skirt were laid down and watched as it started the first layer of a 29 minute print.
Then I came back about 10 minutes later to check on the print and found this (below) or rather it was stuck to the nozzle area.
I aborted the print, raised the Z, and went in the other room for a camera. When I got back the residual heat had caused to (fortunately) drop from the nozzle area and onto the build plate. Obviously something caused it to break away from the build plate.
I cleaned off the plate again, brushed off the nozzle area, restarted the print, and watched the first layer go down. It's still running, but I've been checking it regularly.
If you look at the photo, there's an obvious black 'booger' in the blob. (I was previously, as in a few days ago, printing on this machine with black PETg. The current gray is PLA.) I'm thinking that the black booger has been there for some time, and I somehow missed it when giving the nozzle area a quick visual and brush-off between most prints.
Anyway, I just checked on the new print, it's progressing as expected.
