g81-to-heatmap

See also: https://github.com/PrusaOwners/prusaowners/wiki/Bed_Leveling_without_Wave_Springs

OctoPrint Plugin

OctoPrint user? Check out OctoPrint-PrusaMeshMap!

Description

This script converts 3D printer "G81" bed mesh level output (Prusa, maybe others) to a heatmap for easy viewing. For example, your printer may output the following with G81:

  0.33000  0.29435  0.25157  0.20167  0.14463  0.08046  0.00917
  0.30509  0.28572  0.25841  0.22315  0.17995  0.12881  0.06972
  0.27731  0.27026  0.25516  0.23204  0.20087  0.16168  0.11444
  0.24667  0.24796  0.24185  0.22833  0.20741  0.17907  0.14333
  0.21315  0.21884  0.21847  0.21204  0.19955  0.18100  0.15639
  0.17676  0.18288  0.18501  0.18315  0.17729  0.16745  0.15361
  0.13750  0.14009  0.14148  0.14167  0.14065  0.13843  0.13500

This script will convert that output into something like this:

Above heatmap shows which bolt to turn, what direction and how many degrees. All displayed distances are relative to the center point (green star).

Usage

Prerequisites

To use this script, you will need to install the following Python libraries using pip or some other method:

• matplotlib
• numpy

Getting Your G81 Output

The Prusa i3 MK3 uses G80 do mesh bed leveling, after which G81 becomes available to view the mesh bed level status. You will need to do the following:

1. Do a mesh bed level operation by selecting it in your printer's interface or by executing G80 directly with all of its prereqs, check your printer's documentation.

2. Send a G81 command to your printer via a tool like Octoprint or Pronterface. For this example we'll use Pronterface, as it's part of Prusa's Slic3r install package. You'll get output similar to the following:

     0.16417  0.17111  0.17528  0.17667  0.17528  0.17111  0.16417
     0.16213  0.16579  0.16805  0.16889  0.16832  0.16635  0.16296
     0.15991  0.16129  0.16224  0.16278  0.16289  0.16258  0.16185
     0.15750  0.15759  0.15787  0.15833  0.15898  0.15981  0.16083
     0.15491  0.15471  0.15493  0.15556  0.15659  0.15805  0.15991
     0.15213  0.15264  0.15342  0.15444  0.15573  0.15727  0.15907
     0.14917  0.15139  0.15333  0.15500  0.15639  0.15750  0.15833
   

3. Copy the above output and place it in the script in the g81_output_raw string variable. Note the """ around the block, this will allow you to have a multiline string.

4. Optional: Adjust the regex rules underneath to clean this up or replace things as needed. Defaults are already in place for Prusa G81 output, you shouldn't need to adjust unless your output differs from the above example. Ultimately, you want your output to become this:

   0.16417,0.17111,0.17528,0.17667,0.17528,0.17111,0.16417
   0.16213,0.16579,0.16805,0.16889,0.16832,0.16635,0.16296
   0.15991,0.16129,0.16224,0.16278,0.16289,0.16258,0.16185
   0.15750,0.15759,0.15787,0.15833,0.15898,0.15981,0.16083
   0.15491,0.15471,0.15493,0.15556,0.15659,0.15805,0.15991
   0.15213,0.15264,0.15342,0.15444,0.15573,0.15727,0.15907
   0.14917,0.15139,0.15333,0.15500,0.15639,0.15750,0.15833
   

   Note: Notice there were two spaces removed from the front of each line as well!

5. Execute the script. If everything goes well you will have a g81_heatmap.png in the same directory as the script.

Enjoy!