pa calib: print flow value and acceleration #7178
Conversation
Print flow value and acceleration for PA pattern calibration. This should help keep track during adaptive PA calibration.
|
NICE! thank you for this, that's fantastic! |
|
I do like this, especially for those of us with Bambu printers because they don't give us any of this information. |
|
Hi @buzzhuzz
|
Rework pa pattern legent generation to correctly estimate width of the legend section. Current flow value now has variable length which is a longest of PA value and the acceleration for a given test. Few examples: 1. PA value are 4 characters: 0.04 Acceleratioion 3 chars: 400 Flow value will be 4 chars long: 7.98, or 11.3 2. PA: 0.018 Accel: 1000 Flow: 12.35, or 6.345 3. PA: 0.04 Accel: 15000 Flow: 34.34, or 4.567 Rework number-to-string conversion flow to correctly round values at given precision.
|
@SoftFever, thanks for your feedback. I have found a bug in previous implementation which causes legend section to be too-wide in some cases. For example:
|
Perfect! |
Note for BBL printer users: I've been doing lots of Adaptive PA testing on an X1C, and it appears BBL is doing something in FW which interferes with some of the intention of what Adaptive PA attempts to accomplish. Measurements and calibration at a fixed speed track as you would expect, but this is static. If I change layer height (to change flow), but also change speed (to return flow back to its original value), I get a very different PA result. Since the current Adaptive PA does not take speed as an input, any prints at speeds other than where the Adaptive PA cal runs were performed will be printed with 'inaccurate' PA, since the BBL FW is adding in its own compensation above and beyond the requested PA value. This was off by enough for me to go back to 'normal' PA on my X1C as it was getting better results for prints of differing speeds. |
|
I'm new to 3D printing, and I'm just trying to learn as much as I can. I have a filament where I set the Max Volumetric Speed to 8 mm³/s and the Pattern shows 7.92, which I thought is close enough. But when I set the Max Volumetric Speed to 35 mm³/s, the Pattern shows 16.2. So I'm curious, where does this PA calibration get the flow rate value? |
Speed of print and layer height. Increasing either should give you a higher flow. Also make sure your machine has enough acceleration to actually reach those speeds within the test distance - from start of the line till the corner. this is a useful calculator for acceleration: https://blog.prusa3d.com/calculator_3416/ |
Thank you for the clear answer and also for the calculator link. Cheers! |
|
Big noob here, where is this thing? Thanks!! |
|
It's in Prepare > Calibration (the one on top, not the one inline with Prepare) > Pressure advance |
Print flow value and acceleration for PA pattern calibration. This should help keep track during adaptive PA calibration.
Description
Modify Pattern PA calibration to print current Flow Rate and Acceleration values which should help following Adaptive PA calibration guidelines.
Those values printed below PA values:
Screenshots/Recordings/Graphs
Tests
Manual tests with several speed ratios: checked printed flow rate matches one reported by gcode preview.