Open Beam Mitre Box
by Wired1, published
If you are building with Open Beam you will need one of these. Has 45 degrees as well as 30 and 60 and is gapped for a standard hacksaw blade.
I recomment holding this in your hand on a solid work bench and taking your time with the cut. Use a 24 tooth hacksaw blade for a neat cut.
Open beam is a 15mm x 15mm aluminium extrusion that I am currently building with.
Just print it out.
I used .35mm nozzle, 0.3 layer height, 25% fill (probably should use 50%).