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I've run into the same problem over time. The arm applying pressure is printed pla. I believe were seeing creep in the plastic arm causing a decrease in pressure. As a quick fix I printed a 1mm shim and put it under the spring, this worked although not for long. The correct fix would be a metal...

I'll figure this out someday, Here is the pic of version 1 that did not make it thru on the last post

Hey Julia, Sorry for the long delay in response. Yes that was my attempt at improving the platten.The thinking was to keep the acyrlic build surface and to increase the stiffness without increasing mass. The egg crate is a 2 x 4 lighting grate made of styrene that I got at Home Depot along...

I like this design. it removes the twisting moment on the top beam. Nice. Steve....