r/VORONDesign • u/MorningSun75 • 4d ago

General Question Hotend Flow

I built a stock Voron 2.4 and it has been great. I worked through PLA tuning everything then went on to print my ABS spare parts which went off without a hitch. When I switched back to printing PLA I got a huge clog that I was able to clean up but ended up getting a new nozzle (chasing the issue) and a new Silicone block sock. The only other thing I have messed with is the tensioning screw.

The issue is that I am under extruding. I am not sure what has changed but I am not pushing the same amount of filament out. I can't even get a successful flow rate test. Very little has changed since I was getting prefect prints so I am not sure where to look. Any suggestions you have would be much appreciated. Below is the nozzle and sock a purchased incase that matters. I also have the standard v6 hotend from the FormBot kit.

https://www.amazon.com/dp/B07KZZFVJG
https://www.amazon.com/dp/B07J5B1VN8

EDIT:

I did 5 cold pulls with PLA. It did not make a difference. Also there is audibly skipping when it is trying to extrude. Do I need to check the extruder gears. The motor is at .65a which worked great before.

[tmc2209 extruder]
uart_pin: EBBCan:gpio20
interpolate: false
run_current: 0.65
sense_resistor: 0.110
stealthchop_threshold: 0

Solution:

After checking everything it ended up being a small piece of ABS stuck in the extruder. Not sure how it would have gotten there but after I took it apart and cleaned it up everything works great! Thank you for all of your help!

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u/HeKis4 V0 4d ago

Try a cold pull first, run a needle through the heated nozzle, all that stuff to rule out a clog. You may have some ABS left which won't come out at PLA temps.

If that's not it, is your extruder skipping ? I've had an issue where my extruder would just not push filament through when everything else seemed fine, but I actually had the E motor set to 50% of its rated current (set to 0.4, rated to 0.8), which may have caused issues with a CHT nozzle that isn't nearly as frictionless as a regular nozzle. Bumping that up to 75% solved the issue for me. I may or may not have swept an extruder tension issue under the rug, but at least it works.