Large format pen plotters with up to 8 separate pens were available for different line weights. Color was mostly avoided because the reproduction process of the time was still centered around diazotype[1], or monochromatic ammonium blue printing.
[0]https://piratefsh.github.io/2019/01/07/computer-art-history-...
But you made it much more "leaner". I will try it on my Prusa
The print might not fare that well though the post system, though, so maybe it wouldn't be suitable for postcards. But it can be a nice touch.
I've had a post card based business idea for ages. Can anyone recommend a printer that prints quality postcards? I'm looking for something in the sub $2,000 range. I pulled that number out of thin air so I have no idea of that's a too much or too little.
The printer calibrates, pauses, you attach the pen, press continue, and it'll do the plot without zeroing the Z-axis again.