Use stronger materials such as ASA 275, PETG or Modified PLA (e.g. Strongman)
Set infill to 20%
Print without supports
Suggested resolution is 0.2mm
Variants
Small - 25mm
Three corners - holes for 4mm countersunk head screw
Three corners - holes for 4mm flat head screw
Two corners - single - holes for 4mm countersunk head screw
Two corners - single - holes for 4mm flat head head screw
Two corners - double - holes for 4mm countersunk head screw
Two corners - double - holes for 4mm flat head head screw
Medium - 30mm
Three corners - holes for 5mm countersunk head screw
Three corners - holes for 5mm flat head screw
Two corners - single - holes for 5mm countersunk head screw
Two corners - single - holes for 5mm flat head screw
Two corners - double - holes for 5mm countersunk head head screw
Two corners - double - holes for 5mm flat head head screw
Big - 35mm
Three corners - holes for 6mm countersunk head screw
Three corners - holes for 6mm flat head screw
Two corners - single - holes for 6mm countersunk head screw
Two corners - single - holes for 6mm flat head screw
Two corners - double - holes for 6mm countersunk head head screw
Two corners - double - holes for 6mm flat head head screw
Inspiration
I was looking for some nice brackets and I realized, that most popular Corner Brackets are published under less permissive license so I decided to make my own set, better and with more configurations and with free license.
Support me
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Enjoy your Corner Brackets and let me know, if you make one for yourself!