Purge blobs in the middle of a print
Hi, I have a RRVC4 300 hybrid with the stock rapido UHF and diamondback 0.4 nozzle and an orbiter Filament Sensor (without macros only as a Sensor).
I am trying to print with creality high speed PLA.
In the middle of a print, the print head would stop, purge some material and unload then reload that continue printing.
This leaves purge blobs all over the print and I can't figure out what's going on.
I'm using a quite conservative 30mm/s flow rate (in the flow rate test I got to 45 mm no problem) 210 C nozzle temp and 60 C bed.
At first I thought it was due to the enclosure so I left about 2in of the front door open and it didn't help.
Does anyone else have this problem? Would appreciate all the help I can get, it's driving me nuts 😅
15 Replies
Double check your slicer that you aren't trying to do color changes?
I thought that might be the case but no, single color and no color swaps in the slicer
It looks to me like your tangle detection is reacting. That's what it looks like when I try to print with some really rough material that has a lot of friction in the PTFE tube.
That would also explain the partially stalling travel moves... it looks exactly like it does on my setup when that happens
If you're not using any abrasive material, it's probably due to a kink in the PTFE tube or because the cardboard spool doesn't unwind easily.
ooh, good call Dizzy
Yeah that sounds about right, I tried to move the spool off the spool holder under the bed and I tested it now and there are still blobs, I even replaced the PTFE tube with a larger diameter one.
I thought that maybe I could just up the temps as well
Any idea where the clog macro is located? I also thought that I might move it to the filament change position so it doesn't ruin the print every time
[gcode_macro T0]
variable_enable_insert_detection: True # enables the insert detection
variable_enable_runout_detection: True # enables the runout detection
variable_enable_clog_detection: True # enables the clog detection
variable_unload_after_runout: True # unload filament after runout has been detected
variable_resume_after_insert: True # resumes the print after inserting new filament
Here it is
I also recommend this mod:
https://www.printables.com/model/1080617-rat-rig-v-core-4-ptfe-tube-support-for-smart-senso
Printables.com
Rat Rig V-Core 4 PTFE tube support for Smart Sensor for Orbiter v2 ...
A way to keep the PTFE tube straighter and reduce false positives tangle detections. | Download free 3D printable STL models
It solves most of my fail tangle/clog detections with non abrasives/rough materials
My guess is bump up the hot end temp a bit. It looks like the material may not be fusing and therefore building up on the nozzle.
I tried it but it didn't work, I think it might be the filament sensor itself, once I unplugged it completely the prints are working flawlessly with the same gcode.
Did this as well, thanks
Solution
Then you 100% got friction problems with your PTFE ...
Or that's why I need to use some filaments like this
Any recommendations on a good PTFE tube? I guess AliExpress isn't good enough
I've also tried a few, actually ... but the best results so far come from a Bambu Lab PTFE tube, 2.5–4 mm
I'll give it a shot, thanks
BTW beautiful printer 😍