After nozzle change MK3 keeps jamming
Hi!
I decided to print some miniatures so I put my 0.25mm nozzle on my MK3.
Unfortunately after some time during the print the filament jammed. I tried some stuff but it kept jamming and jamming. I then removed the 0.25mm nozzle and put in the 0.4mm again...Not it also keeps jamming with the standard nozzle. What did I do wrong?
I fastened the nozzle while it was hot and I used a big spanner to hold the block so I would not damage it.
After a jam when I remove the filament I see a big blob at the end of the filament. I thought "Okay, probably the PTFE tube is not all the way to the end". So I removed the hotend entirely and made sure the PTFE tube is all the way in. I put it back and tried it again with the 0.25mm tube. It went all the way to 20% of the print (more than ever before) until it jammed again. 👿
Anybody got an idea what the problem might be?
Thanks!
Re: After nozzle change MK3 keeps jamming
Possibly a clogged channel somewhere above the heat break. I'd remove both the filament and the nozzle and try and clean out as much from above & below. If you're seeing a big blob at the end of the filament, there may also be some melted good ness further down the extrusion path. It sounds like once you jammed it with the small nozzle, the blockage was there and moving back to the larger size did not allow that to pass by itself either.
As for the root cause? extrusion rate too high and temp too low would of allowed the molten filament to start backing up. I'm keenly interested in seeing what happens when we start to adjust these two.
P.S. , what type of filament are you using?
Re: After nozzle change MK3 keeps jamming
It maybe time for a "cold pull". Please google the technique. This is intended to grab any loose bits in the nozzle track and help you pull it out. You need to get your nozzle to mostly hot temperature, and you let your filament be getting ready to melt and you start pulling it up through the extruder.
Good luck, but definitely, check out youtube videos on this so you don't hurt yourself, or your printer.
Nick-