Whiteboard square tool
thingiverse
I wanted a square tool to draw right angle lines on my whiteboard. Couldn't find one so I just designed one myself :-) You'll need: 1x 20x2mm aluminium flat bar of your desired length 1x m4x12 countersunk head screw 1x washer 1x m4 nut, I used an cap nut Drill a hole into the flat bar, secure it with the screw and you're good to go :-)
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