Writing Postcards with a 3D Printer

Not a 3D printer but really cool video by Stuff Made Here explaining how he tried to make 'realistic' handwritten forgeries with a pen plotter: https://www.youtube.com/watch?v=cQO2XTP7QDw

The Z-axis homing problem could be solved by adding a "pause" command (gcode M0, I reckon) at the very start.

The printer calibrates, pauses, you attach the pen, press continue, and it'll do the plot without zeroing the Z-axis again.

So does this mean if you give it a swivel knife it can also be a vinyl cutter?

Very nice! I used the same trick to make a PCB by making the printer use a marker to draw on the parts that I didn't want to etch:

https://www.stavros.io/posts/make-pcbs-at-home/