I’m still playing with the Natural ABS Filament (and having fun), but now I think I have a problem with the extrusion.
I printed one plate of six small crossed 3D pieces with success without encountering any problem (see fist image). But when I started the second plate, 25 minutes late or so, I had problem with extrusion. Often the filament was not coming out, which for some of the piece cause adhesion problem, for the other, the piece looks OK, but while printing I notice that plastic would sometime stop coming out. (see second image)
The problem is not only after retraction, it also started (or stopped…) while already laying down a line of the cross. What make me think it’s is more a hardware problem that a software (not that it could not be worked around with software), it is that the first plate printed OK, but not the second.
I had printed about 16cm^3 of plastic before starting those print. Always at 230C and (exactly the same config than this post except for less retraction length) printed. I had a bad feeling that I had the same problem I was having with cheap filament bought from an other source (The Natural ABS Filament is from LulzBot). So I disassembled the head and you can see that the filament filled the head up to the peek, even between the peek and the PTFE tube tube. (see third image) This must be because the filament does not goes out has fast has I want it to go and just accumulates in. Then I assume this made more resistance because the filament up there is colder.
Should I not use 3mm filament with a 0.35 nozzle ?
Should I increase temperature ?
Should I go slower (when apparently a solution for other problem would be to go faster) ?
I’m starting to think that I will drill my 0.35mm nozzle to 0.5mm and I’m here in hope that you can talk me out of it.