Multi Pressure Advance (Nozzle relation) #2326

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MrUnknownDE · 2026-04-06T04:09:29+02:00

MrUnknownDE commented

2026-04-06 04:09:29 +02:00

Originally created by @ianalexis on 8/31/2025

Multi PA

Enable the possibility of loading more than one PA according to the nozzle, as it has a direct relationship.

Useful for avoiding multiple profiles just for nozzle changes, but also for new machines with tool changes that allow for nozzle changes while maintaining the material.

"Legacy” value with a single value and no nozzle, take that value as before.
Single value (e.g., 0.4,0.2), it is taken as legacy.
If there is a value without a incomplete value ("0.5," || ",0.2") is ignored.
If nozzle does not match the listed values:
- 1 PA value = using that value
- Multi PA values = ~~linear~~ PChip interpolation like Adaptive Pressure Advance (IF WE WANT TO GO BACK TO LINEAR WE MUST REVERT THE LAST COMMIT).
"Smart" Order, if the user set pa/nozzle the algorithm will swap the values
- If 1 column only contain multiples of 0.05 and:
  - 2 column only contain multiples of 0.05 = No Swap
  - 2 column contain any non-multiple of 0.05 = No Swap
    - Nozzle is the one with more 0.05 multiple values.
- If 1 column contain any non-multiple of 0.05 and:
  - 2 column only contain multiples of 0.05 = Swap
  - 2 column contain non-multiple of 0.05:
    - Nozzle is the one with more 0.05 multiple values.

Nowdays Prusa do this by:

    "filament_start_gcode": [
        "M572 S{if nozzle_diameter[filament_extruder_id]==0.4}0.02
			{elsif nozzle_diameter[filament_extruder_id]==0.5}0.018
			{elsif nozzle_diameter[filament_extruder_id]==0.6}0.015
			{elsif nozzle_diameter[filament_extruder_id]==0.8}0.01
			{elsif nozzle_diameter[filament_extruder_id]==0.25}0.09
			{elsif nozzle_diameter[filament_extruder_id]==0.3}0.065
			{else}0{endif} ; Filament gcode\nM142 S40 ; set heatbreak target temp"
    ],

+240 Prusa profiles that could be converted into 41 profiles analyzed in a logarithmic table.

Adaptive Pressure Advance:

I just adapt when it takes the PA value but maybe we have to:

add the nozzle size to it as a value = Nozzle, PA, flow, acceleration
- Using multiple APA models.
- interpolate it's resulting values with a potential curve based in the PA.
use it as it is and do not adapt it

TODO after Merge

Prusa profiles could be readapted to use this structure and no longer have the values in filament_start_gcode.

*Originally created by @ianalexis on 8/31/2025* # Multi PA Enable the possibility of loading more than one PA according to the nozzle, as it has a direct relationship. <img width="707" height="241" alt="imagen" src="https://github.com/user-attachments/assets/20597fd8-11ed-4756-a2a0-7dc67c469284" /> Useful for avoiding multiple profiles just for nozzle changes, but also for new machines with tool changes that allow for nozzle changes while maintaining the material. - "Legacy” value with a single value and no nozzle, take that value as before. - Single value (e.g., 0.4,0.2), it is taken as legacy. - If there is a value without a incomplete value ("0.5," || ",0.2") is ignored. - If nozzle does not match the listed values: - 1 PA value = using that value - Multi PA values = ~~linear~~ PChip interpolation like Adaptive Pressure Advance (IF WE WANT TO GO BACK TO LINEAR WE MUST REVERT THE LAST COMMIT). - "Smart" Order, if the user set pa/nozzle the algorithm will swap the values - If 1 column only contain multiples of 0.05 and: - 2 column only contain multiples of 0.05 = No Swap - 2 column contain any non-multiple of 0.05 = No Swap - Nozzle is the one with more 0.05 multiple values. - If 1 column contain any non-multiple of 0.05 and: - 2 column only contain multiples of 0.05 = Swap - 2 column contain non-multiple of 0.05: - Nozzle is the one with more 0.05 multiple values. Nowdays Prusa do this by: ```json "filament_start_gcode": [ "M572 S{if nozzle_diameter[filament_extruder_id]==0.4}0.02 {elsif nozzle_diameter[filament_extruder_id]==0.5}0.018 {elsif nozzle_diameter[filament_extruder_id]==0.6}0.015 {elsif nozzle_diameter[filament_extruder_id]==0.8}0.01 {elsif nozzle_diameter[filament_extruder_id]==0.25}0.09 {elsif nozzle_diameter[filament_extruder_id]==0.3}0.065 {else}0{endif} ; Filament gcode\nM142 S40 ; set heatbreak target temp" ], ``` +240 Prusa profiles that could be converted into 41 profiles analyzed in a logarithmic table. <img width="1284" height="1006" alt="imagen" src="https://github.com/user-attachments/assets/f755fffc-4c1f-4411-bfbc-1263cf680d26" /> ## Adaptive Pressure Advance: I just adapt when it takes the PA value but maybe we have to: - add the nozzle size to it as a value = Nozzle, PA, flow, acceleration - Using multiple APA models. - interpolate it's resulting values with a potential curve based in the PA. - use it as it is and do not adapt it ## TODO after Merge - Prusa profiles could be readapted to use this structure and no longer have the values in filament_start_gcode.

MrUnknownDE added the 2.4.0 2.4.0 labels 2026-04-06 04:09:29 +02:00

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Reference: github/OrcaSlicer#2326