My dad got himself a Snapmaker 2.0 for an early Christmas present and as hard as I’ve tried to troubleshoot online to help him fix it, there seems to be too many problems that are perhaps related. For one we cannot remove the official printer filament from the nozzle. Even at high temperatures the filament will not budge. I started with the filament that came with the printer and the prints were fine other than the filament sticking to the mat regardless of temperature. With great effort I’ve managed to scrape it off. My dad found a heat gun was very effective, but he just about melted the magnetic mat. When he went to replace the filament it sooner broke in the extruder module than came loose, even at high temperatures. He completely disassembled the extruding nozzle and managed to clear out the stuck filament then swapped out for a different color of official filament. This filament printed well enough for the first few prints, aside from the crusty residue of course, but now it only prints the very first layer then stops. I’ve tried time and time again to recalibrate and adjust temperature settings but nothing seems to work. Just a few minutes ago I recalibrated the printer and the filament managed to break and I could not remove it. I opened it to find that the gear had ground down the filament to a fine dust. I’ve just about given up. Any help at all would be greatly appreciated. Sorry if this is the wrong place to post this.
If the filament is sticking too well to the bed, try raising the nozzle a little using the adjustment while its running. If the nozzle is too low, the filament can’t extrude and this will cause a backup/blockage.
I’ve had the drive gear chew out filament (mainly cheap stuff)
Using the unload feature I found that using a scriber to scrape out the bottom of the tooth as it indexes and then blowing the dust out helps.
As to why you keep getting jams and breaking filament I’m not sure? With the extruder at temperature I don’t even use the unload feature just open the latch and pull it out. I do use the load feature as it assists to guide the filament into the extruder before closing the latch.
It sounds like you might be to low and that is what is causing the blockage and chewing out of the filament.
Pug
Check your retraction settings and temp. I got my SM a couple of weeks ago and saw that Luban defaulted to 5mm retraction, which seems way to high for a direct drive print head and more appropriate for a bowden setup. I set mine down to 1mm before I even ran a test print. I also started at 205 for temp. For my other 3d printers, I typically start a new filament at 5 degrees below it’s suggested max temp to start, then run a temp tower if that doesn’t look good to me. If you are running on the cold side and also have too much retraction, it could be solidifying in the heat break and clogging the nozzle not long after the print starts. These are hard to clear because the clog is above the melt zone but below the drive gears.
Might just be bad filament. The spool that I received as a pack-in turned brittle after a couple of months (both the unused remainder and objects that had already been printed). I couldn’t load it without it snapping off. Prior to that, it printed OK. Note, however, that I was one of the Kickstarter backers, and Snapmaker is supposed to have switched to another manufacturer for their branded filament. Still, it can’t hurt to buy a different brand and try it, if nothing else helps.