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Thread: FIlament jam/grind at height.
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09-21-2015, 08:48 PM #4
- Join Date
- May 2015
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- 3
I can't tell you how many times I ran into this problem in the first two months of printing...hundreds would be my guess. In the end I traced my fundimental problem down to a dirty nozzle. That doesn't mean I didn't address other issues along the way like the hob-bolt and extruder block being designed for 3mm and not 1.75. I redesigned both, printed a new extruder block with the right size hole and made a new hob-bolt to fit the smaller filament. One day while I was cleaning the extruder I found a small hang-up between the nozzle and filament guide right where they meet in the heater block, chamfering the leading edge of the nozzle fixed that one.
But like I said I eventually tracked down the real culprit and that was a few very small bits of PLA that I had used on my initial test run before switching to ABS. The higher heats needed for ABS carmelized (for lack of a better word) that PLA against the inside of the nozzle causing the majority of my air prints. It took a lot of soaking and cleaning to remove those little bits of burnt plastic, but I was rewarded with weeks and months of flawless printing afterwards. Now I periodically test my nozzle by pushing a piece of filament through by hand...anything other then a smooth easy extrusion means it's time to clean. Oh and I'll never run PLA and ABS through the same nozzle again!
Mike
Holes and pockmarks in print walls
06-04-2024, 09:14 AM in General 3D Printing Discussion