The XY Plotter design leaves a lot to be desired.
You will design a new holder for a new writing implement.
You will all be given different writing implements. Staying in your teams, prototype a new holder for the new “pen”.
If there is time, attach it to your plotters. You might have to redesign the limit switch holders and placements. Cable management may need to be addressed. Is a servo the “right” way to go?
You have free reign of the shop, I have materials, and I can help with the lasers and mills if needed.