ABS and extruder throat coggled
Hi all,
I come from a custom Anet A8 which I put aside for a Prusa original MK3S... mainly because of some challenges with ABS.
So.. I received the printer few days ago and, after assembling the kit and going through calibration, I switched the factory PLA to ABS.
I used PrusaSlicer last version (default ABS settings) to slice the model, and loaded the gcode into the SD.
After few minutes of printing I realized the filament didn't come out the nozzle.
So...
- unloading the filament didn't work
- pushing the filament by hand to extrude the node didn't work
- using the needle to check the nozzle didn't work.
- I tried also a procedure documented in the website to heat to 270 degrees and do some operations.. didn't work.
I had to disassemble the extruder: I discovered a big block of unextruded ABS between the end of the PFTE and the throat.
Have you ever had this issue with ABS?
I got suggestions to replace the stock throat with a full metal one. Does it work?
How do you print ABS, with which settings?
Apart of this hiccup, the MK3S is really a great printer!
Cheers
Marco
RE: ABS and extruder throat coggled
May as well just throw the printer away. Coggling cannot be reversed. We're so sorry.
RE: ABS and extruder throat coggled
Ignoring the Bear Bait - take the time to learn the Prusa.
It is a very good printer - but it is different than you are used to.
Maybe spend some time with PETG before moving on to ABS. At least the fumes won't poison you.
RE: ABS and extruder throat coggled
Apart of kidding, have you ever experienced this issue? May it depend by the filament? To print abs I have to go up with temperatures: this should cause issues, I guess.
cheers
RE: ABS and extruder throat coggled
Unless you are running a steel nozzle, it is also possible that the Prusa nozzle temp for ABS (255C) may be too high for your particular ABS filament. That would be an odd circumstance, but could expand the melt zone enough to create a jam in Prusa's expanded throat heat break. What is your ABS filament manufacturer's recommended temp range?
If you are on a steel nozzle, then the concern is in the opposite direction - nozzle temperature being too low. In this case, the jam is a clog in the nozzle rather than up above the heat break's thin neck.