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Dan Boschen developed this tool for visualizing frequency-domain content of filters using a sum-of-phasors approach.

https://archive.ph/PzPop

A few years ago I made a pen plotter attachment for Prusa MK4 ( https://www.printables.com/model/827264-pen-plotter-attachme... ) and at the time I didn't have a good way to turn artwork into G-code for it, and I put the project on ice for a while. I recently wanted to dabble in line art again and made a small browser app to make it easier. As agentic AI tools of 2026 are quite addictive, it rather quickly grew into something quite a bit more - an integrated browser CAD/CAM for pen plotters that