Bondtech BMG owners what are your accel and jerk settings?
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Hello @Gear , on my Kossel mini BMG bowden I am using accel 3000, max speed 1800, jerk 1200, current 1400. and in the slicer for PLA I am using 4mm of retraction at 30mm/S retract/prime speed. I get excellent quality retractions.
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Mines is as follows. Direct drive. 1.1mm retraction
M566 X800 Y800 Z300 E2000 U400 V2000 W2000 ; Set maximum instantaneous speed changes (mm/min)
M203 X9000 Y9000 Z1800 E5000 V5000 V10000 W20000 ; Set maximum speeds (mm/min)
M201 X1500 Y1500 Z1000 E5000 U500 V2000 W2000 ; Set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E700 U1000 V2000 W2000 I30 ; Set motor currents (mA) and motor idle factor in per cent -
@gear said in Bondtech BMG owners what are your accel and jerk settings?:
E120.
be aware that if you use pressure advance such a low e jerk value will slow down your printing speed
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@burtoogle
how long is your bowden tube? -
@veti said in Bondtech BMG owners what are your accel and jerk settings?:
@burtoogle
how long is your bowden tube?Approx 500mm (printer's currently printing so not exact measurement)
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Oh, and I use 0.5mm of z-hop.
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@gear I agree that your extruder acceleration and instantaneous speed settings look low.
Here are the relevant values from my configuration but bear in mind that I use 5 Bondtech BMGs with a Diamond 5 colour hot end and my Bowden tubes are only about 150mm long.
M92 X80 Y80 U80 V80 Z3200 E409:403:407:405:403 ; Set steps per mm
M566 X1200 Y1200 U1200 V1200 Z100 E3600:3600:3600:3600:3600 ; Set maximum instantaneous speed changes (mm/min)
M203 X50000 Y35000 U50000 V35000 Z450 E3600:3600:3600:3600:3600 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 U1000 V1000 Z100 E3000:3000:3000:3000:3000 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 U1800 V1800 Z1800 E600:600:600:600:600 I20 ; Set motor currents (mA) and motor idle factor in per centM207 S3.5 R0 F1800 T1800 ;set firmware retraction
M572 D0 S0.40 ; set pressure advance coefficient
M572 D1 S0.40
M572 D2 S0.40
M572 D3 S0.40
M572 D4 S0.40 -
@deckingman @burtoogle which such high jerk values don't you find your extruder to make a louder sound, this might have put my off at first.
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@gear said in Bondtech BMG owners what are your accel and jerk settings?:
@deckingman @burtoogle which such high jerk values don't you find your extruder to make a louder sound, this might have put my off at first.
I don't think it is very noisy. The Titan I had before was much noisier, it went clack, clack all the time but the BMG is quiet.
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@burtoogle said in Bondtech BMG owners what are your accel and jerk settings?:
I don't think it is very noisy. The Titan I had before was much noisier, it went clack, clack all the time but the BMG is quiet.
That's exactly what I found too.
