Has anyone tried an aluminum extrusion frame?

Has anyone tried an aluminum extrusion frame like the link below?

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I used these feet exactly in my build. In combination with the Dual-Endstop firmware I am quite happy with the result. My general conclusion is, that I now have payed a bit extra for the initial squaring of the tube frame.

you can also use

The adapter is fixable with screws. There a also a couple of other tools for the 30x30 alu frame.