cannot get past the nozzle cleaning process
I'm having a very frustrating time trying to print. Each time I try a print the machine does a nozzle cleaning process that produces a rectangular dot pattern in the front right corner of the printing plate and almost always aborts the print at this stage. Very occasionally a print happens but it's rare, and yet the nozzle is not blocked or dirty. Is there a way to turn off this dot pattern cleaning process?
If you are getting a rectangular array of dots your filament is damp.
Cheerio,
RE: cannot get past the nozzle cleaning process
If you are getting a rectangular array of dots your filament is damp.
That's intriguing. Is it known what causes the dot pattern? Can the printer somehow sense an effect of the damp filament and drives that particular nozzle cleaning pattern in response, in an attempt to resolve the problem? Or is it a "passive" effect where the wet filament causes individual bursts or dots to be deposited?
RE: cannot get past the nozzle cleaning process
Thanks for the suggestion @DIEM, although the PCblend has been stored with silica gel I've put it in the drier for a few hours and will try again later.
Like @JURGEN, I'm curious to know how the CoreOne knows the filament is damp. Do you have any pointers in the documentation because I couldn't find anything with the normal searches.
The extruder is not pushing filament out mechanically but moisture boiling inside the hot end messes with the internal pressure and causes oozing. If the volume of ooze is enough it leaves a dot, if not it remains on the nozzle tip.
The slowly changing thickness of ooze at the nozzle tip interferes with the pressure sensor causing the bed to appear uneven, unstable or perhaps, as far as the printer can tell, the previous print has not been completely removed; so again, as far as the printer can tell, it is unsafe to proceed.
Cheerio,
RE: cannot get past the nozzle cleaning process
I'm having a very frustrating time trying to print. Each time I try a print the machine does a nozzle cleaning process that produces a rectangular dot pattern in the front right corner of the printing plate and almost always aborts the print at this stage. Very occasionally a print happens but it's rare, and yet the nozzle is not blocked or dirty. Is there a way to turn off this dot pattern cleaning process?
what filament type are you using?
RE: cannot get past the nozzle cleaning process
Hello @EvoDesigns, I’m using PC Blend. A previous response to my message (thanks @Diem) seems to have correctly identified my problem as damp filament - 6 hours in my filament dryer has the Core One working perfectly. The Core One seems a lot more sensitive to dampness than my Mk3S but now that I’m scrupulous about drying filament the Core One is producing great prints. I hope Prusa releases the filament box for Core One soon!
RE: cannot get past the nozzle cleaning process
I had issues with PCCF last week and I could not get it to pass even after I dried the filament twice. Glad you got it working, but if you ever run into the issue again you can reduce the nozzle temperature before it probes. Please take a look a the code before for the Start G-Code. This helped out and I haven't had any issues, I can start the print remotely and not have to worry about the nozzle cleaning.
M109 R{((filament_notes[0]=~/.*HT_MBL10.*/) ? (first_layer_temperature[0] -10) : (filamnet_type[0]0 == "PC" or filament_type[0] == "PA") ? (first_layer_temperature[0] - 55) : (filament_type[0] == "FLEX") ? 170 : 170)} ; wait for temp.
RE: cannot get past the nozzle cleaning process
Thanks for that tip @evodesigns. I did wonder about a gcode fix but I’m not very familiar and would prefer not to go up that learning curve right now. I will keep your solution as Plan B in case I get further problems!
RE: cannot get past the nozzle cleaning process
Have a look at this thread:
There may be a solution on page 4
Normal people believe that if it is not broke, do not fix it. Engineers believe that if it is not broke, it does not have enough features yet.