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@hma
small progress.. front triangle is done. we got a jig - it is a total disaster (made from bosch extruded alu profiles and aluminium cones). the alu parts suck in the heat, making brazing impossible..
we ended up building the triangle in a vice (bb shell) and holding the other tubes by hand. needs a bit of cold set, but the mitres did their magic and the frame is surprisingly straight.
the result:
and please let me demonstrate the proper method for making miter cutouts when your printer is acting like an asshole: