90 degree assembly square 90 mm - glue relief, 18 mm thick

90 degree assembly square. An L of 90 x 90 mm, 26 mm arms, 18 mm thick, printed flat. THE GLUE RELIEF. The corner you actually push against the two boards is cut back by a 5 mm radius groove. Without it, squeeze-out piles up exactly there and lifts the square off the work - the square then reads 90 degrees while the joint is not. This is the one detail that decides whether a printed square is useful or decorative. THE REENTRANT CORNER of the L gets a 6 mm fillet instead (erosion then dilation:…

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