This workbench corner bracket offers a practical and structural improvement over similar designs available on Maker World. While traditional 3D-printed brackets sandwich the wood between printed walls, this tends to cause long-term issues due to PLA fatigue - this design introduces a more robust approach by allowing direct wood-to-wood gluing in the center of the joint. (See image below to see what I'm talking about. The areas I'm pointing re the “problem” areas where the PLA is sandwiched between the 2x4s.) 

The “real ones” are made out of Metal, which work great since the metal is going to help in the support, but they fail if we make them out of plastic. So instead, I'm just trying to use them as a guide. 

Key Advantages of This Design:

• Central Glue Joinery: Unlike others that embed the PLA between wood layers, this bracket acts as a guide, not a final load-bearing component. The design allows you to glue the wood pieces together at the core, ensuring a solid, unified structure. (See below to what I'm talking about as well)

• Bracket as a Positioning Aid: The printed brackets help you align and position your wood accurately. Once aligned, screws are required to permanently secure the assembly. The brackets are not designed to bear full structural loads on their own.
• Efficient Print Layout: Each print plate includes 4 bracket pieces, laid out with pre-flipped orientation to work seamlessly on both the left and right sides of the frame. You’ll need two plates (8 brackets total) for a standard workbench corner setup.
• Precision Fit for Standard Lumber: Designed with a semi-snug tolerance of 1–2 mm for nominal 2x4s. Note that a standard “2x4” actually measures 1.5 inches by 3.5 inches due to post-milling reductions and what not. 

Assembly Notes:

• This bracket is not intended to be used alone - wood glue and screws are essential.
• The design prioritizes modularity and durability, ensuring that your workbench can withstand movement and repeated use without stressing the printed components.
• The combination of wood-to-wood adhesion and guided alignment leads to a significantly stronger corner joint than PLA-sandwiched versions.

Cheers! 

PS: This is how a pattern / layout would look like. The “long” board will be the one that has 4 screws instead of 3. Not necessary, really, but I wanted to have extra support on the long piece of my workbench.