Came across this link pretty quickly. I've played around with a cnc using a pen similar to the link but I used the permanent markers by Sharpie (the same ones that are sold at electronic stores for 3x the price). Had mixed results with the Sharpie but it looks like the pens used by the youtube guy work pretty good.
Hi justone , that was exactly I want to do too, can you provide a diagram/schematic diagram of your work if you don't mind?
That was just a link to someone else who pretty much did exactly what you were looking to do and doing it with very simple methods and surplus (old floppy drive parts) computer parts.
Have you studied the video?
As far as helping you along I am in no position to do so.
I will give my thoughts on how to proceed though.
Load a uno with the grbl sketch ( yes there is a sketch available).
Have another uno with a sd card that reads the file and sends it to the grbluno using the serial ports of the 2 unos.
Construct the plotter mimicking what the youtube guy did.