I wanted a lab rocker, but (as usual) didn't like existing designs. No, "not designed by me" is not the most critical flaw by itself. But anyway, here's my take on a servo-driven DIY rocker with variable amplitude and frequency. I made it to develop #photoresist and to etch #PCB , but I'll probably use it to develop glass plates of my #largeformat camera at some point.
Geometry of the liquid cobtainer is customizable, as well an many other parameters. 3d-model is written in #OpenSCAD with #BOSL2
https://www.printables.com/model/1502809-servo-driven-rocker-for-pcb-fabrication-large-form