Printing with 0.25 nozzle turn into despair
I have got problems with my brand new MK3S since I have tried to print with a 0.25 nozzle :
LCD display :
I followed the video recommendations "how to replace the extruder nozzle" : Settings > temperature > 285°: When I did this operation, foolish symbols and squares were displayed first before what looked like a system crash happened. Since this moment, the display never came to normal : the upper left quater of the display screen displays black pixels.
Using a 0.25 nozzle :
I first try printing small part in PETG. I think the GCode parameters were ok. The first one was fine. When printing the second part, nothing was extruded from the nozzle. Until the moment I realized what happened, a lot of matter from the filament was stuck inside the PTFE tube making the tube out of order. The (heavy) repair is in progress: I have just ordered replacement PTFE tubes to fix it. I'm pretty disgusted and I'm just wondering if this is a good idea to carry on printing with a 0.25 nozzle if such problems are frequent... except if you have a particular recomendation related to printing with 0.25 nozzle. For instance, I think it may have been a good idea to unload the filament after the first print... Please let me benefit from your experience.
RE: Printing with 0.25 nozzle turn into despair
I routinely print with a 0.25mm including PETG prints. You do need to figure out the appropriate settings. If the extruder or nozzle are plugging up, a bit more temperature may be required, although this will contribute to stringing. Generally, start at slow speeds until you get that working, then increase speeds. Be aware that PETG is more viscous and will require slower speeds than PLA.
If you're new to a 0.25mm nozzle, starting with PLA might be a good idea until you get a feel for the implications of the smaller nozzle.
As for the display, log into the estore and contact support via chat directly. Send them that picture. It may just be a loose cable. Was your printer a kit or pre-built?
Next time you have a PTFE tube jam, try this:
- Raise Z to max.
- Open the idler door on the extruder.
- Remove whatever filament you can reach inside with needle nose pliers or tweezers.
- Heat up to 265C.
- Use a 1.5mmx15cm rod (available at hobby stores) to poke down through the filament path, down past the Bondtech extruder gears and into the PTFE tubing.
- Press gently down, being sure not to twist the extruder. Brace it with your free hand.
- Try to force the filament down through the tube into the hotend where it will extrude out.
If the PTFE tube is still blocked, try this:
- Heat up to 285C.
- Remove the nozzle.
- Using pliers to hold the brass rod, insert it from below until you meet resistance.
- Continue to apply upwards pressure and allow the brass rod to heat up.
With any luck, the plug will loosen and pop up. You can alternate pushing down as well.
Be sure to reinstall the nozzle correctly using the E3D instructions.
If you'd care to save your part and settings off in a project 3MF file, zip it and upload it here, we can make further suggestions.
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RE: Printing with 0.25 nozzle turn into despair
@bobstro
Many thanks for your answer. My printer is a kit version. Everything worked pretty well until I changed the 0.4 nozzle for a 0.25 nozzle. Warming up the nozzle to 285° manually(as shown in Prusa's video) seems to provoke a bug. I will check the cables and, if nothing is changing, I will contact the support.
Please find hereunder the 3mf file. Let me know if something seems incorrect. I think your recommendation of training with PLA before trying with other material is a good advise. The final version of my parts has to be mechanically resistant. I can print with PETG or ASA, but I'm afraid ASA will be more tricky, isn't it?
I did everything you recommended to unblock the PTFE tube. In my situation the filament was broken to the end of the tube without a grip. It was so strongly jammed that I had no other possibility than cutting one part of the tube to unblock the filament. The consequence is that I'm looking forward to receiving a new PTFE tube from Prusa's shop now.
Kind regards