Using retractable markers
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Diterex commented
It would be nice not to have to worry about the heat making the markers dry out. A multi-colored less overkill version of https://www.youtube.com/watch?v=c3LhK2SAusk&t=4s would be amazing. Also check out https://www.youtube.com/watch?v=lcOcetpHhTU.
Sakati84 commented
Hi, Sorry but i will definitely not do anything involving electronics here. I build quite some robots and have experience in this field. I just don´t think whatever come out of it would be widely used because of the costs and efforts need to rebuild something like this.