20 20 Extrusion Corner Stiffener.
thingiverse
For 3D printers built with a cross-style base made from 20x20/20x40 aluminum extrusions, these designs provide substantial reinforcement and effectively eliminate longitudinal wobble of the vertical gantry. With four in place, there is zero wobble at all. PRINT 100% INFILL! To assemble all four, you will need sixteen each of: M4*L stainless steel 304 hexagon socket hex thin head cap screws bolts short head allen screw and M4 hammer head T nut fasten nut connector. This version takes advantage of round holes to save filament. If you'd rather not have holes, consider using this alternative. https://www.thingiverse.com/thing:3196244
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