I think it should be better to start with multiple printheads in a row instead of a matrix. So I printed 9 separate printheads which are individually assembled and then bolted together. The 3D printed parts are only for fit checks.

With the new toolhead the printing process should be faster because with 9 nozzles in a row every printhead must only print the space between two nozzles.

I have written a Python Script for post processing the gcode from Matthew Rayfields Pixels to Gcode.

The gray stripes show the printhead area.

The red dots show the xy coordinates on the paper.

The blue dots show the gcode coordinates which are executed by the printer.

The graphic is created by the matplotlib - library.

The next step will be testing the electronics for 9 printheads.