Trying to calibrate Bambu Lab’s TPU95A pressure advance with Orca Slicer like I’ve done for other filament types in the past but this time every line looks the same.
Is my range wrong? What’s your PA setting for this filament?
Note: printed with Flow Calibration checkbox unchecked.
Humidity inside dryer box is 29%. Ambient is 38%.
For TPU95a depending on the brand Im at .110 -.190, when I use TPU in my Bambu printers I dry it for 12 hours before I print, then I print from the dryer to the machine with the dryer still on…this summer my basment has been very humid even with a dehumidifier on around the clock I can barely keep it under 40%.
Did you enable Pressure Advance in the profile before running the test?
Yes, and I can see the instructions in the Gcode viewer.
I’ve now repeated the test with a new range, from 0 to 0.2 and still got the same identical lines.
I’ll try next with the latest Bambu Studio beta instead of Orca Slicer.
Tried with Bambu Studio manual calibration and all lines looked the same again.
Tried an ABS calibration and it worked as expected.
Is it possible my extruder can’t handle TPU? I have a spare one, might give it a try.
Same results if you print the PA tower instead of the lines?
Do you have to un select calibration? I only have p1ps, but my father has a X1C and I belive when was tuning a filament he was having issues with I un-checked calibration in the menu in Bambu Studio (send print job to) where you can choose AMS, Bed leveling, I’m on the Bambu Studio Beta 2 1.7.0.65, there is a calibration tab now you can choose auto/manual cali for Flow dynamics ¶ Flow rate. I have been using Beta 1/2 for 2 weeks or so, I was usng Orca but ended back to Bambu Studio
Tried the tower with a range of 0 to 0.2 and hardly saw any change from top to bottom.
With Orca Slicer, the calibration checkbox needs to get unchecked. With Bambu Studio beta, running the calibration skips the usual screen with the 3 checkboxes so it’s all taken care of by the software.
So I tried something that I thought was extreme. With Orca Slicer, I ran a Pressure Advance line calibration with a range of 0 to 1 and I finally see a progression in the lines.
The sweet spot is around 0.50.
Wasn’t expecting that but I never printed TPU before so what do I know?
I never tried Bambu’s TPU, from what I have read people arent getting great results with it, but maybe this is why? IDK did you try a test print with that number yet?
Yes but just a simple round lid. Not much of a test for the PA mechanics but it printed well. I’ll try the temperature tower next.
Did you figure out if that value is correct?
I’m having similar issues performing “Flow Dynamics Calibration,” I’ve dried the filament for 24+ hrs @ 55*C. I’ve tried the BS 0 to 0.3 and the PA in Orca 0.3 to 1.5; there is no difference, and I am unsure what else to do.
Overall the prints look good with the BS “Bambu TPU 95A” profile, but shouldn’t we always perform a PA (flow dynamics cal) test for each filament?
(Maybe this follow-up justifies a new thread)
