This file allows you to print 'trim inlays' for your 20x20 aluminium extrusions in any colour you desire!
Simply scale the STL along Z axis (Z only - not X & Y) to your desired length and print vertically in vase mode. For very long lengths I advise you print in sections.
I have successfully printed this upto a height of 280mm! Just be sure to use a large brim (20mm+) for stability.
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Use a Brim and one bottom layer (no top layer) and print in Vase Mode!
Drawn up quickly on Fusion 360