Impossibile to use the PA Plate
I'm trying to use the nylon bed, but it's practically impossible to get past the probing stage. The printer feels like the nozzle is constantly dirty.
I also tried to get help from customer service, and as a last resort, they sent me a replacement load cell, but it didn't help.
This problem ONLY occurs with the nylon plate. If I use the smooth PEI plate, the textured plate, or the satin plate, I have NO problems.
Has anyone encountered similar problems?
RE:
I'm trying to use the nylon bed, but it's practically impossible to get past the probing stage. The printer feels like the nozzle is constantly dirty.
I also tried to get help from customer service, and as a last resort, they sent me a replacement load cell, but it didn't help.
This problem ONLY occurs with the nylon plate. If I use the smooth PEI plate, the textured plate, or the satin plate, I have NO problems.
Has anyone encountered similar problems?
I've used the PA plate quite a bit recently and haven't had any issues. By probing, are you talking about the nozzle cleaning stage or the bed leveling? What is it doing? Is it displaying an error that nozzle cleaning has failed? If this is the case, this is a known problem for some with this printer. If you turn off the heat block heater before doing the probe it should get past this. The reason Prusa support didn't tell you about this is they are not allowed to discuss g-code changes. Also you can disable the nozzle cleaning by commenting out the G29 P9 line which is doing a mini bed probe. Another option is installing the alpha firmware where (apparently) they've patched this. I've been running it for a few days and haven't had any issues so far.
M104 S0 ; Turn off heater G29 P9 X208 Y-2.5 W32 H4
RE: Impossibile to use the PA Plate
Also, I don't think it's the plate that is causing this, since you are using Nylon/PA the nozzle temp in much higher than other types of filaments. As an experiment, try to do a print with PEI plate and Nylon/PA. Does it do the same "Nozzle Cleaning Failure"? The problem identified by members of this forum is that the PWM signal to the heater element causes interference with the load cell and that is why the failure occurs. With the g-code I posted above, it turns off the heater before doing the nozzle cleaning step.
RE:
First of all, thank you so much for your reply.
I'll try your code, but I don't think it will work. As a test, I've already tried running the EXACT SAME nylon print program on all my other build plates (smooth, textured, satin) and everything runs smoothly, from nozzle cleaning to build plate leveling.The leveling issue occurs both with the nozzle cleaning and with the random build plate probing, and REALLY the only difference in all of this is the PA build plate. I don't know...
RE: Impossibile to use the PA Plate
Ok, if I turn off heater the problem solved... what the hell...? but I have the problem only if I use the PA plate...
RE: Impossibile to use the PA Plate
Ok, if I turn off heater the problem solved... what the hell...? but I have the problem only if I use the PA plate...
Not sure why it's worse with the PA plate (I don't have one to try), but there seems to be an issue where the loadcell -- which outputs a very low voltage signal and requires a special amplifier/digitiser chip that's on the loveboard -- provides false and inconsistent readings because of the high voltage pulsed power going to the heater. This will potentially affect homing, cleaning, and leveling/probing. See https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/z-axis-trouble-but-only-when-printing/ for example.
RE: Impossibile to use the PA Plate
If its the amount of current drawn that is interfering with the load cell sensing then you could try to preheat the bed to the slightly higher than the desired temp for 10-20minutes before hand. That way when you start a print the bed wont be drawing any power during probing. Worth a try to see if it makes any difference.
RE: Impossibile to use the PA Plate
Can confirm though that this seems to be fixed in 6.4.0-alpha. I've switched back to the stock g-code and haven't seen any of these issues pop up... yet.
RE: Impossibile to use the PA Plate
unfortunally not for me. With the 6.4.0-alpha I've the same problem and I need to use the new g-code
Can confirm though that this seems to be fixed in 6.4.0-alpha. I've switched back to the stock g-code and haven't seen any of these issues pop up... yet.
RE: Impossibile to use the PA Plate
I think the problem is linked about the nylon coating in the plate. but good to know.
Ok, if I turn off heater the problem solved... what the hell...? but I have the problem only if I use the PA plate...
Not sure why it's worse with the PA plate (I don't have one to try), but there seems to be an issue where the loadcell -- which outputs a very low voltage signal and requires a special amplifier/digitiser chip that's on the loveboard -- provides false and inconsistent readings because of the high voltage pulsed power going to the heater. This will potentially affect homing, cleaning, and leveling/probing. See https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/z-axis-trouble-but-only-when-printing/ for example.
RE: Impossibile to use the PA Plate
if I know the problem, it's by the current in the head, not in the plate.
If its the amount of current drawn that is interfering with the load cell sensing then you could try to preheat the bed to the slightly higher than the desired temp for 10-20minutes before hand. That way when you start a print the bed wont be drawing any power during probing. Worth a try to see if it makes any difference.