Thingiverse
MakerWorld
MyMiniFactory
Printables
Thangs
Cults
CGTrader
Youmagine
Gambody
Etsy
Tags
Gusset 3D Printable Models
Shelf Bracket
MakerWorld
R4diat0r
Shelf Bracket For All Loads
MakerWorld
Faran3D
3030 Extrusion Gusset (Corner Bracket)
Thangs
the don lon
20x20 Aluminum Extrusion Brace
MakerWorld
Fantastic Plastic Person