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This is a hardware bug but I could not find any repo for the MK4 hardware so I post it here.
Printer model
MK4 (pre-assembled) with original Prusa enclosure
Firmware version
6.0.0+14794
Upgrades and modifications
removed plastic cover from the LoveBoard
using original Prusa 0.6 mm brass nozzle
filament spool is held outside enclosure – issue is even worse with filament on original spool holder inside enclosure
Printing from...
PrusaLink
Describe the bug
Observations
After printing one piece, the nextruder gets significantly warm. Using my thermal imaging camera, I was able to identify 51 °C roughly one minute after the print finished inside the print head close to the big gear wheel. The temperature in there seems to be more or less homogeneous so it is fair to assume that the big gear wheel pushing the filament is roughly 51 °C, too.
When printing several parts directly after each other, the printer will eventually struggle to push the filament through the nozzle.
The gear wheel grinds the filament and thus looses traction.
The nozzle does not clog.
For a couple layers, one can visually see how extrusion rates go down, then at some point the filament stops moving completely and the gear wheel grinds a chunk out of it.
How to reproduce
print some ColorFabb HT @ 270 °C with any nozzle (0.4 mm / 0.6 mm original Prusa brass nozzle)
use the original Prusa enclosure
use Input Shaper "Structural" mode
print for at least 3 h without cooling down in between
Conditions
These are my specific conditions. You might be able to reproduce the issue with slightly different settings, too. Especially if your ambient temperature is higher than 21 °C.
This is a hardware bug but I could not find any repo for the MK4 hardware so I post it here.
Printer model
MK4 (pre-assembled) with original Prusa enclosure
Firmware version
6.0.0+14794
Upgrades and modifications
Printing from...
PrusaLink
Describe the bug
Observations
How to reproduce
Conditions
These are my specific conditions. You might be able to reproduce the issue with slightly different settings, too. Especially if your ambient temperature is higher than 21 °C.
Expected behavior
Files
No response
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