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A comment on An intro to Pen Plotters (2019).

Re:An intro to Pen Plotters (2019) by rhklein on Wednesday August 11, 2021 @01:35PM (#28145062)
I built an interesting Bi-Polar Plotter with multi-pen capabilities this year. Really cool to look at. :) https://hackaday.io/project/177633-dual-disc-polar-printer
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