He was being praised as a good boy at the time of the photo.
8bittech
Kinda like chocolate for me.
I know this is an older post, but for anyone else reading. This is solder slag from the selective solder process (and very poor QA). It really should be removed to avoid becoming dislodged in the future and causing a short somewhere on the board. Use a wood or plastic item and some denatured alcohol to carefully remove.
Just my 2 cents, but don't waste your time. Just get a good sealable tote and pull out the roll to print then put it back. I printed spacers to fit each roll to fit on a 1.5 pvc. Moisture would still wick up the filament and get brittle and break. So I'd have to take it apart to feed the filament and every time a roll ran out, I'd have to take it all apart again. It just all became more work than it was worth. I now use a sealable tote or when I can find them cheap enough Tupperware cake holders.
Dude looks like Hitler
Find a tree branch, varnish, add boards, and wrap with twine. My two demons have never scratched anything else.
That's my neighbors cat, baby aptly named. I'm not sure the squirrel isn't stalking her.