Pressure nozzle problem?
Hello,
I got stuck with a problem for a long period that begins to frustrate. It started with the replacement of 0.25 nozzle due to clogging, this time I ordered 0.4mm and after calibration there was no problem, I spent almost 5kg filament.
Then it began to make a problem as if there was no pressure in the tube, still on the first step (charging tube) after checking the 9 points there is a thin line, not like a previously full thick line. The same can be seen with the printing itself, there is a too thin line and at times a dashed line, while in those moments we hear a knock in the extruder.
I tried several settings, the height of the lаѕер (Z axis), the print speed, the new nozzles of 0.25 and 0.4 but the same situation.
If I try to release only the extruder at 215 degrees, I hear a knocking, while on 260 degrees there is no knocking, but there are bits in the filament that climbed. The 260 degree first layer setup has no problem, ie significantly better (photo in attachment).
Please for advice what to chack, or how to troubleshooting this problem.
215degree results:
Tube pressure step:
260 degree results:
RE: Pressure nozzle problem?
Pictures to small.
Pictures can put in the forum in a different way, and then we can see the pictures big.
try a different way.
RE: Pressure nozzle problem?
- Bed contamination leading to poor adhesion.
- Live-Z calibration issues.
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A dirty PEI print surface. Even if you don't think this is the cause, it's always a good idea to make sure your PEI surface is clean before trying any other fixes. If it's a smooth PEI sheet, take it to the kitchen sink and give it a good dunk with Dawn (original formula, no vinegar or hand softener variants) dishwashing soap or your local equivalent (e.g. Fairy in UK). Use a clean paper towel to clean it off, and another to dry it. Avoid using any sponge or cloth that has been in contact with grease. Above all else, avoid touching the PEI print surface. Once it's good and clean, you should be able to use 91%+ isopropyl alcohol between prints, 100% acetone when that fails , and another dunk when acetone fails. Worst-case, use a 3M 7445 ScotchBrite pad or equivalent on smooth PEI to give it a very light buff, but only infrequently. If you've got a textured powder-coated PEI print surface, the official instructions are to use 91%+ isopropyl alcohol on it only.
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If you have not already done so, try using Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine. It's much easier to make mid-print adjustments accurately with. In general, start high (less negative) and work lower (more negative) in large increments (e.g. 0.1mm) until the filament starts to stick on its own. When you've got your Live-Z setting adjusted properly, you should be able to gently rub the extruded lines on the PEI surface without dislodging them. Then start lowering (more negative) the level until there are no gaps between layers.
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Pressure nozzle problem?
Hi,
i try several times with cold pulls, there no was any filament trush in the nozzle, i try to calibrate with live z, but i still have a problem. Now the first leer is great without any mistakes, but when it comes to a second leer it makes a problem, too thin a filament is released (see picture).
I do not understand the first step - Bed contamination leading to poor adhesion. ?
When I try to stretch the filament with my arm through the nozzle, it flows most normally ...
Idea how to solve the problem, I changed a few nozzles of different size, but without success.
RE: Pressure nozzle problem?
Pictures to small.
Pictures can put in the forum in a different way, and then we can see the pictures big.
try a different way.
Here is the picture with bether quality...
https://ibb.co/BVqKMcC
https://ibb.co/SRKmm89
https://ibb.co/L6L9z7z
https://ibb.co/kSGXvJw
https://ibb.co/PjMqFNh
https://ibb.co/XyLzWjZ
https://ibb.co/DWb2Msd
RE: Pressure nozzle problem?
There needs to be a FQ of using the forum that explains the simple task of attaching photos using drag and drop. No one seems willing or able to drag images and set simple things like link method. I give up.
As Bob has suggested: a cold pull will clean the nozzle of old filament and over cooked by products that are jamming the orifice.
Once you can print a clean line, then concentrate on cleaning the bed surface. Your print bed is fouled with finger prints and finger prints keep PLA from adhering. Wash the bed in soap and hot water, scrubbing with a fresh paper towel. Then handling the bed by the edges, dry it with afresh paper towel, and keep hands and finger away. You will be happy with the results.
After the bed is clean, now you can calibrate Live-Z accurately.
RE: Pressure nozzle problem?
There needs to be a FQ of using the forum that explains the simple task of attaching photos using drag and drop. No one seems willing or able to drag images and set simple things like link method. I give up.
As Bob has suggested: a cold pull will clean the nozzle of old filament and over cooked by products that are jamming the orifice.
Once you can print a clean line, then concentrate on cleaning the bed surface. Your print bed is fouled with finger prints and finger prints keep PLA from adhering. Wash the bed in soap and hot water, scrubbing with a fresh paper towel. Then handling the bed by the edges, dry it with afresh paper towel, and keep hands and finger away. You will be happy with the results.
After the bed is clean, now you can calibrate Live-Z accurately.
Guys thanks for the help, we have made progress, but only on the first layer, the second-third or any one is problematic, ie it does not fill nicely but leaves thin lines (Figure 1)
.
The first layer is quite good, as can be seen in the calibration of the first layer (Figure 2), but each one is as in Figure 1, a thin line. I think it's still a problem with the nozzle pressure, because if you look at Figure 2 there is no filament before printing, after checking the 9 points. When it was all right, before each printout there was a thick line of printed filament after checking the 9 points, before printing any pattern, now it is gone.
I've tried a million live-z variants, the bed is clean, the nozzle temperature is 215 on a bed of 60 ...
I don't know where I'm wrong.
Made all the suggestions from the above of you guys
The bed clean
Nozzle clean
First Layer Calibration is OK, gives great results (Figure 2)
Could it be related to slicing software? I use PrusaSlicer 2.0.0 with profile-settings from the software itself.
https://ibb.co/7rs40cW
https://ibb.co/8N5mVy4
RE: Pressure nozzle problem?
Your Layer 1 is still much too high (or you have a clog, or both). A proper layer one will look something like this:
Cal Circles <-- STL files
CalCircle_gcode <-- MK3/S gcode
A nozzle clog limiting flow would explain the bad layer 2. Consider doing a COLD PULL:
https://help.prusa3d.com/article/lnbcnhg76k-cold-pull