Magnetic Building Board 90 Degree Triangle Brace
thingiverse
This is a 90 degree triangle used to brace uprights on a magnetic building board for model builders. It uses common cabinet magnets. One source is here: https://www.allelectronics.com/item/mag-123/cabinet-latch-magnet/1.html EDIT: 02/04/2018 The above magnets appear to be sold out. Regular ceramic rectangles will work too. A source is here: https://supermagnetman.com/collections/fer-rectangle/products/rect0750c-20?variant=29741050307 They are listed as "0.770" (19.56mm) long x 0.593" (15.06mm) wide x 0.118" (3mm) thick". Use two sandwiched together in place of the above latch magnets if you can't find the originals. Glue the magnets in with 5 minute epoxy. See my magnetic building board lever clamp here: https://www.thingiverse.com/thing:2540725
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