Print head under extruding/clogging
My BoXZY recently acquired the problem that the first 20mm or so of a print work great, then over the next 100mm the extrusion rate fades off to 0. When I open the extruder to look I have a giant candle like plug filling the entire extruder from the washer down (smaller if I kill the print right away, but still a glob of plastic right up against the extruder.
I am working with Hatchbox PLA and this started happening with settings that had been working fine before. When it started it also usually took a few hours of print time before jamming. Now its about 45 seconds, usually within the first layer. I have tried temperatures from 170C-130C with no change. Testing manually, if I keep extruding constantly at max speed it doesn't jam, but every time there is a change in direction or any other pause it starts to jam.
While I'm at it, I have also had trouble since starting months ago with my corners over extruding and my straightaways under extruding, any thoughts on either problem?
Is this a good question?