Bambu lab release new the A1 mini, using hotend pressure.
I think this is light enough on the MCU
bambulab a1 mini measure Inductance for pressure advanced auto calibration
Prusa mk4‘s hardware can do same thing.
I’m interested in how they do auto Pressure Advanced
without computer vision
Best posts made by penguinya
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Auto pressure advance turning by hotend pressure
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High speed ADC for string gauge z probe
Using string gauge and AD620 for z probe. I think RP2040 has enough sram to do it
More details for auto pa, still need more data from hotend pressure.
https://forum.duet3d.com/topic/33667/auto-pressure-advance-turning-by-hotend-pressure -
RE: Auto pressure advance turning by hotend pressure
@nikscha Here is a post about sampling speed
https://forum.duet3d.com/post/251488
Latest posts made by penguinya
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RE: Auto pressure advance turning by hotend pressure
@penguinya Just early version, I think it is ok.
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RE: Auto pressure advance turning by hotend pressure
@Charlie According to the simulation results, the impact on printing is unobservable.
Aluminum 6061, 100N force
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RE: Auto pressure advance turning by hotend pressure
@Charlie Yes prusa has implemented it
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RE: Auto pressure advance turning by hotend pressure
@penguinya The introduction of bambulab confirmed my guess.
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RE: Auto pressure advance turning by hotend pressure
@nikscha Here is a post about sampling speed
https://forum.duet3d.com/post/251488 -
RE: Auto pressure advance turning by hotend pressure
find a better chip for load cell.
CS1237 http://www.asidesigner.com/Files/PartFiles/15315/222/cs1237_datasheet.pdf
spi bus 1.28kHz ADC and PGA -
RE: Auto pressure advance turning by hotend pressure
@nikscha Bambu Lab tests pa every print, and 50ms really slow, HX711 can reach 80HZ, Prusa using HX717 320HZ, higher the sampling frequency, the more beneficial for auto PA testing.