Print settings for 0.25mm nozzle and PLA
Hey all,
So my Prusa is rocking along with no trouble with it's 0.40mm nozzle. I installed a 0.25mm nozzle, but I am getting skips when printing the second or later solid layers.
I spent all day tuning the Slic3r PE 0.25mm nozzle settings. I have tried the following variables:
- Heat (195 to 230)
- Print speed (35mm/s to 110mm/s)
- Flow rate (23% to 95%)
- Layer Height (0.05 to 0.20)
- Default and 0 retraction.
And I am sure a number of options.
I seemed to get best results at 195c at 110mm/s with 75% flow rate, 0.15mm layer height. I suspect some of the problem has to do with heat creep up the nozzle since there is less volume of filament being used. I believe this is why faster print speeds caused less skipping.
Eventually the skipping causes the filament to erode and it has to be removed.
The problem begins between layers so I suspected that retraction might be a problem, so I disabled it for the print. It didn't and I gave up after trying.
It's a low-poly vase from Thingiverse.
RE: Print settings for 0.25mm nozzle and PLA
I have the same problem with the 0.25 nozzle. Did you solved it? Or anyone knows which is the best way to print propperly witht 0.25? In my case the problem starts even in the first layer...
RE: Print settings for 0.25mm nozzle and PLA
Same thing here. Just started a week or so ago, and my initial prints with the .4 nozzle have been very successful. But with a .25 nozzle, I succeed about one time in six. The typical result is that part way through the print (often, but not always, near the beginning), I'll start hearing the extruder clicking and filament stops flowing. If I am nearby, I can immediately unload the filament, clip the end, and reload it but the print is ruined. If I'm not nearby, it keeps trying to print and seems to make the problem much worse. The clog gets larger and I may not be able to unload the filament, and need to remove the nozzle and use a brass rod to push up the heat break to force the clog upwards until I can pull the filament out.
I am not certain yet, but I think the problem is the Prusa custom heat break. There are a number of current threads about how the Prusa heat break isn't the standard e3d 2 mm tube, but has a custome designed 2.2 mm "funnel" at the top of the heat break before narrowing down to the standard 2 mm tube. With the .25mm nozzle, it seems like the flow is slow enough that heat leaking up it can make the filament in that region soften and spread out to fill the 2.2 mm funnel, and then can't fit down the rest of the tube when it narrows down to 2 mm.
I'm trying to lower the print temperature to 205, and I'll see if that helps. And I'm coming here to review those threads about the 2.2 mm heat break and see what other solutions people are suggesting (other than replacing it with a standard e3d version). If I find a consistent solution, I'll try to remember to come back to this thread too and post what I found.
Good luck!
RE: Print settings for 0.25mm nozzle and PLA
[...] So my Prusa is rocking along with no trouble with it's 0.40mm nozzle. I installed a 0.25mm nozzle, but I am getting skips when printing the second or later solid layers.
Looking at your gcode, I see some immediate oddities:
- You are using 0.06mm infill extrusion widths. That's... a bit narrow. The printer is going to have a hard time printing extrusions narrower than the nozzle. Try 0.25mm or larger.
- You are using a 1st layer extrusion width 0f 0.35mm. This is a bit outside the general guideline of 120% of nozzle width. You might try 0.3mm.
Things falling apart on layer 2 makes perfect sense if that's where your infill starts. I suspect you've got a few of the extrusion widths wrong. I've got my notes on using different nozzles with the Mk3 & PrusaSlicer here. Tip: If you enter an extrusion width of 0, PrusaSlicer will calculate reasonable widths based on your set nozzle size.
I'd also work with something smaller than a 9 hour print until you get the basics working!
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RE: Print settings for 0.25mm nozzle and PLA
We have the following parameters with Cura 4.0.0 ( unable to get great quality with PrusaSlicer) to print our fiNe-scale (1/160) locomotives and wagons :
with a 0.20 nozzle ( our standard nozzle) : layer height : 0.08 (initial : 0.2 ) (*) , line width : 0.19
with a 0.25 nozzle : layer height : 0.08 (initial : 0.2) (*) , line width : 0.23
for both : with PLA EVO 3DONLINE : T° 206°c (initial : 210°c), 100% infill density ( small wall thickness), fan speed : 80% (regular fan speed at layer : 10), linear advance factor : 30, flow rate : 100%, speed : 15mm/s (first layer : 10mm/s, support speed : 15mm/s), print acceleration : 500 mm/s2 print jerk : 8mm/s, experimental tree support activated with default parameters, retractation : retract at layer change, distance : 0.8mm, speed : 0.35mm/s, limit support retractations, z hop 0.6mm when retracted.
We have 100% print success.
(*) if required, the layer height is managed with the experimental adaptive layer Cura process :
for the 0.20 nozzel : layer height : 0.10, adaptive layer maximum variation : 0.05, adaptive layer variation step size : 0.01, adaptive layer treshold : between 200 and 700 .
for the 0.25 nozzel : layer height : 0.12, adaptive layer maximum variation : 0.06, adaptive layer variation step size : 0.01, adaptive layer treshold : between 200 and 700 .
RE: Print settings for 0.25mm nozzle and PLA
Thank you for your help. I will try this, soon.
RE: Print settings for 0.25mm nozzle and PLA
E3d extruder is made for a max temperature of 40, if you are printing with higher temps , install a extra cooling fan, from a computer cooling fan, to blow in the printer or enclosure. If you have a enclosure, a temp controlled fan wood be the best. A computer fan to test this with hot weather is also a possibility, on thingiverse you can find cases for fans.
On thingiverse you can also find a cooling fan for on top of the extruder, this will cool it very good, let the fan blow upwards, then the heat cannot go to the filament and soften the filament. This update I wood always install, is better for every filament.