Recently on my Creality Hi Combo, on long printings (1 hour or more) after 30 minutes of printing when changing the color.
When the printer retract the current filament an error «FR2849,retract issue, filament cannot be returned to CFS hub, extruder may be clogged» is shown, but the filament is full retracted to the spool on the CFS.
After check all the path of filament I removed the PTFE tube from extruder and I found this:
Removing the piece of filament becomes IS ALL THE FILAMENT ON THE NOZZLE, like if I did a cold retract!!
The bad thing is happen several times on a 7 hour printing.
On short printings whit several filament change do not happen!!!
any ideas about how avoid it?
Seems like you are printing in some kind of chamber? What is the ambient temperature in the chamber when the issue occures? What type of filament are you using?
Hello there, I am using Creality Hyper PLA and the «chamber» is a generic one Amazon.com: 3D Printer Enclosure, Printer Cover with 72mm Exhaust Fan Port, Fireproof, Dustproof, Noise Reduction, for Ender 3/Pro/V2/S1/Anycubic Elegoo, Maintains Constant Temperature, 25.59"x21.65"x29.53" : Industrial & Scientific but I always print PLA with the door and top open, I have it for kept the printer out of dust when not in use or to control the temp when printing ABS.
It is a good place to start, but the thing bothering me is only occurs once each hour and do not occur on small prints!
I am thinking about to change the cutter. will let you to know.
Hello there, An update:
This is the state of my cutter blade:
Seems the tip of the blade has become dull so the filament is not full cut. I will print a long printing next week and let you to know.
As side quest I buy a pack of 10 new blades, but they do not work on neither of my extruders, THE MAGNETS ARE INVERTED so the blade is not kept in place but is pressed all time, so I had to sand my extruder (to the remove the glue of magnet) and change the polarity of the magnet!!!
My printer just completed 800 hours of printing so I will make a full maintenance tomorrow.
1 Like
