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aegean-odyssey / mpmd_marlin_1.1.x

a fork of Marlin firmware (bugfix-1.1.x) for the Monoprice MP Mini Delta 3d printer
GNU General Public License v3.0
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G29 Parabolic Post-Processing #21

Closed PurpleHullPeas closed 4 years ago

PurpleHullPeas commented 4 years ago

Feature Request: It was discussed briefly on Reddit, but I would like an option to perform a parabolic fit to the G29 mesh values via G29 C2 or something like that.

I have found that this works well on my WhamBam surface. I suspect it will also work well on stock surfaces. I hypothesize that this works well because the bed heater being located in the center causes the metal to warp a bit upwards in that location. For the same reason, it may not be the optimal choice for a glass bed.

The parabolic fit might also be a good choice for an alternate AUTO_CALIBRATE_SMALLER.GCODE script that uses the 50mm radius G29 discussed in another issue.

Parabolic Fit Post-Processing Script: https://github.com/aegean-odyssey/mpmd-calibration-experimental

My Calibration Experiments/Results: https://github.com/PurpleHullPeas/MPMD-AutoBedLevel-Cal/blob/PurpleHullPeas-advanced_readme/advanced/Advanced_Readme.md

aegean-odyssey commented 4 years ago

Extending the calibration via G29 C1, G29 C2, ... was my thought early on. Unfortunately, there is not enough program space (flash memory) to include code to calculate the parabolic fit. And the parabolic fit code is quite a bit larger than the linear fit code, so even the option to replace the G29 C1 code with G29 C2 code is not available to us.

I am working on a simple web-based solution to process an uploaded CALIBRAT.TXT log file (taken from the printer's micro SD card) and produce a custom Bed_Level.gcode command file. This file would contain g-code commands to adjust the bed level mesh. The parabolic fit would be one of the initial (post-)processing options for the web page.

PurpleHullPeas commented 4 years ago

Completely understandable. Thanks for your work!

aegean-odyssey commented 4 years ago

Early pass at some online tools to do post-processing: MPMD Calibration (experimental)

It's a first attempt at using github's pages ("static pages only") web hosting and jekyll. Since a github pages site only serves up static pages, the original I ported the original python scripts to javascript, so they can execute "client-side" in a browser. I hope to expand the mpmd-calibration-experimental project to include all things "mpmd_marlin_1.1.x calibration" related.