2020 profile corner bracket

Update 4 years later and being more experienced; do not use this. PLA is not stiff enough for a printer frame. Use aluminium or steel brackets. Blind corner joints + 2028 brackets create a very stiff corner at just 50 cents worth of hardware. Use 2028 brackets instead of 2020, it makes a big difference.

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I wanted a stronger corner bracket than the simple corner pieces we all know.

The holes are all 5.2 mm, which results in 5 mm