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/twistedtristudio/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/twistedtristudio/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:

START_PRINT EXTRUDER_TEMP={first_layer_temperature[initial_extruder] + extruder_temperature_offset[initial_extruder]} BED_TEMP=[first_layer_bed_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:

Examples:

• PrusaSlicer/SuperSlicer:

  BED_MESH_CALIBRATE 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

  BED_MESH_CALIBRATE PRINT_MIN=%MINX%,%MINY% PRINT_MAX=%MAXX%,%MAXY%