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Impossibile to use the PA Plate  

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Silver_173
(@silver_173)
Member
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?

Posted : 13/09/2025 9:53 am
hyiger
(@hyiger)
Reputable Member
RE:

 

Posted by: @silver_173

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
This post was modified 20 hours ago by hyiger
Posted : 13/09/2025 2:40 pm
hyiger
(@hyiger)
Reputable Member
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. 

Posted : 13/09/2025 2:51 pm
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