@Lu_Zhang
When printing long prints (4/5 hours) I sometimes get a blob which is soul destroying. I am positive this is caused my the firmware as opposed to the CP6. We print the same item 4 times a day and it happens 1 in 10 pieces approximately.
We print using the external reel only
If you switch the machine off and back on again the printer will still NOT let you extract of retract so something is static in the catch error firmware.
When it happens You cannot extract or retract the filament from the screen and the machine will not allow a factory reset due to filament being inserted. Therefore a manual cut has to take place.
Could the extruder motor be overheating and powering off? Only a power cycle would turn it back on. Seen others route a plastic tube to the extruder and force in cool air - they say this helps. After 5+ hours, the extruder motor is going to be very hot.
That was my first thought but there have been instances where the extruder stops extruding and I have stopped the print and manually extracted filament immediately.
I have also printed same with top off and chamber never goes over 31 degrees. It still happens
Nevertheless, its worth a try as you suggest.
If it is overheating then its a bad design. I do have a spare extruder motor but would like to find root cause.
My “blob of death” issues all went away when I switched out the included PEI plate with a new one from Amazon (under $20). It seemed that the original PEI wasn’t anchoring the object properly, Once it moved even a bit, the nozzle caught and started the blob.
I went thru that stage but it was caused by the software infill / wall overlap defaulting to 30 by Creality design even though their own highlight notes 15 should be the default. (Bambu has 15)
At 30 it caused the nozzle to bulldoze the filament thereby pushing the item over.
Changed to 15 and it never happened again.
AND they still have not changed it to default to 15 @Lu_Zhang
I have printed about 600 hours of Petg transparent (creality/Sunlu/Bambu/Elegoo) all without problems.
I amended the infill at the start of original printing all my Perg as I was lucky to reference my settings from the X1C. I don’t use the System presets unless I am positive they work as expected. When the software upgraded it would lose user process and user filament settings. Quite often had to import user settings from file system. All crazy.
Software is more resilient now but I still check the detail.
