Globbing
I... don't know what else to call this, except "globbing". It produces globs like those pictured (see attached image), seemingly at random, and I'm not quite sure what the cause might be, since I can't seem to catch one forming.
This is more than a little irritating, since it basically makes babysitting the printer necessary - more than slightly inconvenient on a 10+ hour print, as the globs are big and adhered well enough that they are more than capable of knocking the print loose from the bed, or otherwise ruining the print unless cleaned away with my flush cutters. Any idea where to start with resolving this? Thanks.
EDIT: If it helps, the problem started after a blob o'doom nearly got my hot end. Thanks again for any advice.
Best Answer by bobstro:
Did you by any chance remove the nozzle or other parts during cleanup? Check the gap between your heater block and heatsink to see if any filament is oozing out the top of the block. If so, it will ooze out and eventually drop off into your prints, possibly causing those goobers.
If so, this indicates the nozzle is not properly tightened up against the heatbreak. Also verify there is a small gap between the nozzle hex and heater block after tightening the nozzle at 285C.
RE: Globbing
Did you by any chance remove the nozzle or other parts during cleanup? Check the gap between your heater block and heatsink to see if any filament is oozing out the top of the block. If so, it will ooze out and eventually drop off into your prints, possibly causing those goobers.
If so, this indicates the nozzle is not properly tightened up against the heatbreak. Also verify there is a small gap between the nozzle hex and heater block after tightening the nozzle at 285C.
RE: Globbing
Yes, I basically had to remove the nozzle during cleanup. I'll check that. Thank you.
RE: Globbing
@daniel-9
If you have plastic residue in the threads of your heat block you need to be careful since that can cause a false seal until you start to print.
Phil
Stay safe and healthy, Phil
RE: Globbing
@pcweber
So let it sit hot for a bit, let the plastic in the threads drip out?
RE: Globbing
As opposed to screwing the nozzle in with the heat block being cold just kick it up to 285° turn off the power and screw in the new nozzle loosely. Then bring the temperature up to 285° once again turn off the power and tighten the nozzle to the specified torque. Remember that there must be a 0,5 mm between the nozzle and the heat block when tightened. Without the space one could be tightening the nozzle to the heat block as opposed to the heat break resulting in a real monster blob issue.
Regards,
Phil
Stay safe and healthy, Phil
RE: Globbing
I heated the block up and ran the heatbreak through it a few times to clear filament remnants out. Requires a teardown unfortunately.
RE: Globbing
Thanks! Just finished reinstalling the nozzle after letting it soak in acetone overnight to get rid of some crap stuck to the threads (since I had to take it out anyhow. Looks like a .5mm gap
Here's hoping today's test print works out better.
RE: Globbing
@bobstro
Judging by the amount of crap in the acetone rinse, I'm going to guess the acetone took care of matters. Or not, and I'll do a complete teardown tomorrow.