I’ve just finished my MPCNC build.
Right now I’m just running with a pen, because I need to print out a mount for my Kress 800 FME and wait for some end mills to arrive.
Work area is around 700mm x 500mm. I ended up using 25mm Black Enamel Steel Conduit from edwardes.co.uk. It seems to work nicely, although there’s some embossed lettering in some places so you have to ensure the bearings don’t roll over it.
All in all I’m really happy with the system!