Extruder Skipping - Failed Prints

[Jakx12321]

Hello everyone,

My romax v2 keeps failing prints at random locations. Sometimes it gets further than other times, either way, it always fails. I've only gotten one successful print out of it since I bought it and that was the peek fan shroud (very frustrating).

Anyways, I can hear and see the extruder skipping when trying to extrude the filament. It even happens when manually extruding within mattercontrol. I've taken apart the hot end, the ezstruder, shortened the bowden tube but to no avail.

If I let it extrude long enough during skipping it literally digs out a chunk of my filament.

I'm printing in abs bought from seemecnc, using .5mm nozzle, all stock parts, and lowered retraction speed and print speed dramatically to see if it will make a difference.

My guess is that it's binding somewhere but I have no clue where! Any help/insight would be greatly appreciated!

Thanks,
JakX

[Tincho85]

Hi, what temperature for ABS are you using? Can you feed it by hand without applying too much force?

[Jakx12321]

I'm running at 235c. Is that too hot?

It takes a decent amount of effort, not impossible but semi difficult.

[Tincho85]

My guess is that you are printing too cold and that's why it's skipping.
235ºc should be ok, but your thermistor could be reading wrong temps.

Check if it's in place and it would be great if you measure the temperature with a thermocouple.


Also, when you took apart the hotend, did you check for clogs?

[Jakx12321]

Like I said, it prints partially, and the partial print looks great so idk.

I thought that maybe, but I'm a little scared to go over 235c cause the PEEK breaks at 245c right? Although I understand that if it's reading the temp wrong it won't hurt it, but how do I find out for sure? I have no idea what a thermocouple is nor how to use one. Any other way to test it?

It did have a bad clog of abs the other day and I cleaned everything out with acetone and a blow torch, so it's clean.

[IMBoring25]

If you watch the readout, is it staying at 235? With the stock power supply, high power on the bed can make the extruder struggle, especially if you didn't get it insulated well.

If you're at full temperature and it's not driving pretty easily, something is amiss. I was having a similar symptom and disassembled my hot end, only to discover it was still resistant to having the filament passed through it without the nozzle on it. I ran a 2mm drill through the PEEK section (taking several bites at it and always running the drill forward), pushed some filament through it again several times to knock out any residual swarf, and reassembled it and haven't had an issue since.

[Jakx12321]

Pretty rock solid at 235c and rock solid at 90c on the bed at the same time. Drives pretty easy, doesn't seem to be struggling.