This shelf bracket is designed to print without supports and to mount without screws or tools. If you want to mount with screws, grab my mounting plates at https://www.thingiverse.com/thing:3956152
THERE IS ONLY ONE FILE FOR THIS VERSION AS IT WILL PRINT WITHOUT SUPPORTS.
Rescale in your slicing software to get the size you want.
Use NO LESS than 30% infill. More is better.
Watch this IMPORTANT video for printing and mounting instructions:
Super Strong Double Sided Acrylic Mounting Tape (I tested with a 24lb load on 4 sq. inches of tape) : https://www.amazon.com/gp/product/B07LDPQSVJ/
IF a left and right side files are included, print those with the flat/plane cut side down.
I plan to design these brackets in various themes including kids, music, library, shop, kitchen, animals, etc.
DISCLAIMER: Although I have tested the brackets and mounting tape for my own use, I am not responsible for any damage or injuries that may result from your use.