ednisley wrote:dramsey wrote:NOTHING ELSE HAS CHANGED and SUDDENLY YOU CAN'T PRINT
Have you successfully printed
the same model sliced with
the same parameters?
Yes. Aside from removing the nozzle, clearing the clog, reinstalling the nozzle, and re-gapping and leveling, nothing has changed-- that is, none of the profile parameters used successfully before (well, until I noticed things weren't printing and starting playing with stuff. This is all PLA, by the way. And the same spools from the same vendor that printed well before.)
I have printed hundreds of these little fobs for organizations and friends. This current contretemps occurred when I tried to knock out a quick HP logo fob for the calculator conference I'm attending next week.
I think this is the most intractable problem I've had since beginning to use the M2 about a year ago. The only thing I'm reasonably sure of at this point is that it's not a head spacing / bed leveling issue. The symptoms are identical regardless of where on the bed I print (center, corners, etc.) and seem relatively insensitive to Z gap-- even when the gap is so tight the first layer prints with a trough-shaped bead, the results are pretty much the same as printing high enough to get a "correct" bead.
I initially disregarded the possibility of extrusion problems since the filament
appears to be flowing straight and freely from the nozzle at the standard profile settings of 0.35mm nozzle width (although it's really 0.4mm, right?) and an extrusion factor of 0.90. Perhaps someone can tell me if this is the correct appearance of the filament for the first solid layer over a 15% infill:
Maybe it's the filament! No...
Other things I've tried:
-- Bed leveling (many times) and calibration cubes to set Z offset
-- Bed temps between 60 and 70 degrees
-- Extruder temps between 205 and 215 degrees
-- Extrusion factors 0.90 and 1.00
-- Nozzle width settings 0.35mm and 0.40mm
At this point I'm giving up for the nonce-- I've got to get ready for the conference and frankly I need the break for my mental health. But I'll be ready to try any suggestions when I return.
P.S. One other symptom, which I don't have a picture of but happens almost every print: when the head moves to first start printing a line on the bed-- like the first part of the fob after printing the skirt-- the first few mm of filament almost always pull up off the bed as the head moves. Imagine a "tail" 2-6mm long curling back up over the rest of the line, as though the initial bit of extruded filament stuck to the nozzle and was pulled as it moved.
