hi all, one big arsed question to follow lol how much weight would a 20x20 v slot extrustion take before it started to flex? (how wide a printer head beam would 20x20 stand? direct estruder sat on it fans and all for instance) or more to the point what weight at what length? obviously i'm thinking for a 3d printer frame and axis guides. how little material in a frame? eg, 500 Z 600 Y and 700mm X dimentions without having to or 1000mm on the x axis. this one especialy? i'm thinking would a really basic two 'T' set up actualy be sturdy enough? the 'T''s up side down and secured to a table top or some such, would be a peachy portable set up for a 'put away' large unit. how strong would the corner joins be etc etc...? the v slot stuff looks propper taisty on the adds, but... time you start adding per wheel base and then this then a pully mount etc etc soon waps up the price. that said for larger printers its still in the running compaired to the suported bar stuff, or i think it is based on the vids. alas it does depend on how well the wheels would hold on an angle or how long theyd stayed repeatabley accurate.(a single beam set up doesnt seem practicle without some hefty wide exstrusion and/or way too many wheels clamping?) i gues what i'm saying is how good is this stuff with a large hint at somekind of real fugures and facts so i could actualy design and build and get what i exspected. i've got one hit at this build, if it fails i'm fooofed.