Hello,
Sorry for my bad English
I have two printers vertex k8400, I have no particular problems when printing with ABS. But when I try to print with PLA, the extruder continues to block and not be extruded filament.
As photos, seems to clog the level of pipe fittings push. Trying temperatures I realized that at that point there are 66 ° and softens the plastic and locks in fittings push.
Has anyone else had the same problem?
How can I fix?
I have also verified that the temperature does not match the reality. In fact, if imposed at the level of 210 ° hot-end I have about 230-233 °.
The printer is mounted cortrettamente following the instructions.
Could you please check the positioning of the thermistor and if that is not your problem carefully disassemble the hotend to check the length of the PTFE tube.
the length of the PTFE tube is as instructed, the filament locks higher in pipe fittings push. I tested the temperature with an external thermocouple.
the NTC is properly inserted into the hole in the assigned block of brass.
The problem seems to overheat (66 °) of the metal support of the extruder.
I tried to cool the support of the hot-end with a third fan and the mold to a temperature of 175-180 ° and 210 ° with PLA with ABS. So even if the printer stops and remains in temperature, the filament does not expand when heated and it stops.
But it is not normal to have 20 degrees of difference! 4 hot-end mounted by two different people, all have the same defect.
I’ve same kind of issue. This week-end, I’ve tried to print a two colors stuff (blue ABS vs Yellow PLA), but after a while visibly PLA stops extruding while ABS continue alone.
PLA setup for this print was 192°c and 80% flow.
I’ve the same problem last week, but it was with natural PLA on the second extruder. I belive it’s because it’s one of the first print with this extruder. This time PLA was on the first extruder and I’ve good result with yellow PLA.
[quote=“gjoliet”]How do you manage to mesure hot end temperature??[/quote]Best way is to use a thermocouple. IR thermometers are not accurate with small surfaces.
Yesterday night, it was at the point, when trying to print PLA, it stop extruding after fee layers (I’ve the support, 2 or 3 layers and that’s all). I do many try. The filament wasn’t stuck in/before the nozzle. In fact I discover, It didn’t pas thru the pfte tube. I was also unable to unload the filament. I finally get it out, manually. I found he have a very strange shape: it was in accordion : WWWWWWWWWWWWW … and the extruder was unable to push it thru the PFTE tubing. I clean-up the extruder (many PLA residue and dust in it) and cut first 50 cm of filament. No more problem.
My interpretation is, this conjunction of multiple factor: there was many dust and PLA residue in the extruder wheel, this 50 cm was loaded and unloaded multiple times and never consumed, the stuff I try to print need many retraction with very fee filament move forward, with such retraction pattern default 9mm retraction is too much. Therefore damaged filament become twisted and unable to move … PLA is more sensible to this problem than ABS.
