Prusa Core One with 0.25mm nozzle
Hi,
I have a MK3S=>MK4S=>CoreOne upgrade which is now running fine after lots of trouble with the coreXY system to adjust and passing successfully the Y-fine calibration as discussed elswhere...hope this is now stable.
I am using a 0.25mm nozzle in my CoreOne and i experience a lot of problems while loading the filament. It loads and then rams it into the nozzle makes weired noises and then cloggs all the time leading to a complete blockage of the nozzle at the end. It "sounds" a bit to me that the filament loading routine is doing the same at the same speed as when you have a 0.4mm nozzle, but this is just a feeling.
Has someone else this problem, is this a known issue, is there a workaround?
And yes:
I choose the 0.25mm nozzle coreOne model
I adjusted the nozzle diameter and the highflow (to off) in the hardware menu.
Thanks a lot for your help
Torsten
RE: Prusa Core One with 0.25mm nozzle
I've used a .25mm nozzle on my Core One without issues... BUT... I did have issues with specific filaments. Specifically, it did not like, AT ALL, Overture Silk PLA... it broke two times in the extruder head.
I've tried drying it, but haven't tried again.
Sorta of unimpressed with the Overture Silk PLA. Now, the Elegoo Gold Silk PLA worked without an issue.... and it printed REALLY nice at .10 settings.
RE: Prusa Core One with 0.25mm nozzle
I'm using the official Prusa 0.25 nozzle a lot and frequently, swapping between a phaetus 0.6 SiC and the standard 0.4 HF nozzle.
All without any issues, but only with standard and matte PLA & PETG.
Two things to make sure: insert the nozzle all the way against the end-stop, but don't press it against the end-stop, while tightening the thumbscrews. Only very gently lift the nozzle to barely tough the end.
Also, don't apply rotational force to the nozzle. For me, the hotend and thermistor cables kinda force it to rotate a bit while inserting the nozzle all the way in.
And don't tighten the thumbscrews too much. They just need to hold the nozzle in place without being loose.
The issue behind these things, is that you pre-load the loadcell, if the nozzle is strained or pressed against something and calibration/nozzle cleaning/probing can fail.
Did you pinch the thermistor cable between the print head and the thumbscrews? Happened to me.. So maybe your temperature reading is off?
And lastly and the most important: did you change the printer menu and the Slicer to the 0.25 mm nozzle size and unchecked "high flow"?
Otherwise the printer will indeed try to push the filament into the small nozzle the same way it does for the standard nozzle.
RE: Prusa Core One with 0.25mm nozzle
Hi Raaz,
will check these....thank you
And yes set the 0.25mm and unchecked the high flow.
RE: Prusa Core One with 0.25mm nozzle
Okay,
i think i found the issue....the two screws which adjust the pressure of the pulley which presses the filament on the "big wheel" where far to tight screwed in (pressure on the filament was far too high, nearly sqeezing it)
@GBMaryland: Perhaps it is your issue, "pressing" your PLA filament too much that it broke...
Rest i checked was okay...
Again thank you
RE: Prusa Core One with 0.25mm nozzle
Turned out the overture PLA was in fact, wet, and after drying it for five hours or so it seems to print fundamentally OK. But it had to be pretty darn wet for that to be a problem….
RE: Prusa Core One with 0.25mm nozzle
Day 2 with my Core One. Have been using MK3S+ and XL for years. Printing Prusament PLA Simply Green with a .25 nozzle and keep getting jams. Really getting frustrated. I'm used to keeping my filament dry to prevent stringing on the XL. Printing directly from a dryer next to the Core One with a short PTFE tube joining them to reduce tension and sharp curves. Hardware settings are correct. Top vent is open.
Frustrated because out-of-the-box the Core 1 was magnificent. My first few print jobs were flawless - including a relatively big job with PC. I had to change the nozzle, and now I'm having trouble with PLA. I don't know if I've ever had PLA jam in a printer before!
Seems to be a nozzle clog. I unload the filament, heat the nozzle to 235 or so, then reload the PLA and it runs fine, at least for an hour or so.
My next clog will get me reinstalling the nozzle. Other than thumb screws snug but not too tight and the nozzle in place but not jammed too tight, what other advice does anyone have to offer? Does anyone use the nozzle tool available on Printables that allows you to change the nozzle without disassembling the wires or using a wrench on the hot end (only on the nozzle)?
RE: Prusa Core One with 0.25mm nozzle
Seems to be a nozzle clog. I unload the filament, heat the nozzle to 235 or so, then reload the PLA and it runs fine, at least for an hour or so.
Been there too..
Does anyone use the nozzle tool available on Printables that allows you to change the nozzle without disassembling the wires or using a wrench on the hot end (only on the nozzle)?
I simply don't tighten the nozzle that much. I hold the hotend with my left hand in place and use just a naked socket with my right hand.
I tried to use the nozzle changing tool, but my cable routing (kit) is too tight to use it.
You're not "clogging the nozzle", you're getting heat creep. The filament in the extruder gears gets too soft and can't be pushed through the tiny nozzle.
Solutions:
- Reduce chamber temp. -> open the door or increase chamber fans
- Increase heatbreak fan -> Prusa Slicer in Expert Mode - filament settings - custom G-code: "M142 S36 ; set heatbreak target temp" set this to S30
- Print slower, so the extruder will need less force to push the filament through the nozzle
RE: Prusa Core One with 0.25mm nozzle
Thank you - you're right. Reading the Core One manual, I thought opening the door would stop printing. Ambient temperature here has been over 28C, and cabinet temps were climbing to 36. Since opening the door, temps have stabilized around 30 and the printer is working correctly again.
I should have known better. I always leave the door open on other systems when printing PLA. I assumed the Core One would be able to manage the temperature better. Glad this is an easy fix.
RE: Prusa Core One with 0.25mm nozzle
Happy to hear it's working better now!
I assumed the Core One would be able to manage the temperature better.
Yeah.. The whole "printing with the door closed" is more of a thing for rooms that won't go above 23°C. Or if the room is hotter, either use the 0.4 HF nozzle but slow down the speeds a bit or use a bigger nozzle.
Of course we can't always schedule the prints depending on the weather though..
The 0.25 nozzle is quite a princess in this regard too, when printing PLA. PETG would probably still be fine.
Here in Northern Germany, I only had 3 days above 24°C room temperature yet, so I could print PLA with the 0.25 nozzle and the door closed. The chamber helps a lot with warping! But at 28°C room temperature, you probably don't have much warping anyway, if you can block wind.
RE: Prusa Core One with 0.25mm nozzle
And here I was, wondering why my €1000+ Prusa can't deal with printing a mini that my €250 Chinese bedslinger managed to print no problem. Thanks guys!
I opened the door and set a colder filament profile, let's hope it works.