Print Area Bed Mesh

Description

This Klipper macro will create a bed mesh based on the size of your print.

Credit

Complete credit goes to ChipCE (https://gist.github.com/ChipCE/95fdbd3c2f3a064397f9610f915f7d02) for the idea and sample code. I completely rewrote the macro to be more dynamic and for some added features.

Features:

Reusable Bed Mesh - bed mesh will be reused if print area is smaller or equal to the previous one with ability to override
Easy To Add - Nothing to update in the script since the existing bltouch or probe offsets, existing bed_mesh min/max, probe_count values are used from printer.cfg
Seamless Bed Mesh Calibration - BED_MESH_CALIBRATE replaced with new script
Separate axis probe counts - if print area X or y is 50% than available area, probe_count for that axis is changed from the default to 3
Supports Bed Mesh Relative Reference Index - if "relative_reference_index" is set in bed_mesh, it will be reconfigured to use the middle point on the bed
Klicky Probe Compatible - Works with Klicky Probe on Voron

Disclaimer

This is currently in development. While it works on my 2 printers, it's impossible to account for everyone's various config. When first implementing this, be prepared to click the "Emergency Stop" button if it tries to probe off the bed.

Change Log

Combined klicky probe version with regular script
Added 20mm buffer to bed mesh
Fixed issue with bed mesh being skipped when current bed mesh is cleared
Fixed issue with offset expanding bed mesh area out of bounds

Setup

1. Download and install the macro

SSH into the Pi and run the following commands:

cd ~
git clone https://github.com/Turge08/print_area_bed_mesh.git
~/print_area_bed_mesh/install.sh

2. Include macro in your printer.cfg

Through Fluidd/Mainsail, edit printer.cfg file and add the following line at the top of your printer.cfg:

[include print_area_bed_mesh.cfg]

3. Update Moonraker for easy updating

From Fluidd/Mainsail, edit moonraker.conf (in the same folder as your printer.cfg file) and add:

[update_manager print_area_bed_mesh]
type: git_repo
path: ~/print_area_bed_mesh
origin: https://github.com/Turge08/print_area_bed_mesh.git
is_system_service: False

NOTE: You must perform step #1 at least once or Moonraker will generate an error.

4. Option 1 - Modify "start_print" macro in your printer.cfg

Where you normally perform a BED_MESH_CALIBRATE in your start_print macro, replace it (or add it if you didn't previously have it) with the following line:
```
BED_MESH_CALIBRATE PRINT_MIN={params.PRINT_MIN} PRINT_MAX={params.PRINT_MAX}
```

If you want to force a new mesh every time, use the following syntax:

BED_MESH_CALIBRATE PRINT_MIN={params.PRINT_MIN} PRINT_MAX={params.PRINT_MAX} FORCE_NEW_MESH=True

Modify your printer's start g-code in your slicer to include the PRINT_MIN and PRINT_MAX parameters:

Examples:

PrusaSlicer/SuperSlicer:

print_start EXTRUDER={first_layer_temperature[initial_extruder] + extruder_temperature_offset[initial_extruder]} BED=[first_layer_bed_temperature] CHAMBER=[chamber_temperature] PRINT_MIN={first_layer_print_min[0]},{first_layer_print_min[1]} PRINT_MAX={first_layer_print_max[0]},{first_layer_print_max[1]}

Cura (add this to your start gcode at the end of the start_print command:)
```
PRINT_MIN=%MINX%,%MINY% PRINT_MAX=%MAXX%,%MAXY%
```

*(Cura slicer plugin) To make the macro to work in Cura slicer, you need to install the post process plugin by frankbags - In cura menu Help -> Show configuration folder. - Copy the python script from the above link in to scripts folder. - Restart Cura - In cura menu Extensions -> Post processing and select Mesh Print Size

5. Option 2 - Modify your printer's start g-code in your slicer: