Is it likely that the power resistor in a J-Head might just burn up and die?
I had a print fail last night but it just looked like a typical “lack-of-adhesion” issue; here’s a time-lapse of the failure:
I noticed last night when I was trying to print something else later that when I turned on the heat, it would turn off a few seconds later and the temp reading wouldn’t move much if at all (small enough to be normal ambient variation).
I got a few minutes to look closer at it tonight and then noticed that there is a blob of filament coming out above the head. I’m starting to suspect that maybe the power resistor failed late in my last print causing the filament to freeze in the nozzle and back-up over the top?
I don’t have time tonight to pull it apart but I plan to check the resistance of the resistor to see if it’s functioning as expected (and of course I have to figure out how to get the backed-up filament out of the rest of the head as well), but I’m wondering if it’s typical for resistors like this to fail, or if there is an expected “duty life” in hours that I should be keeping track of and replacing the resistor before something like this happens again?