A bracket to build woodworking projects like a 3D printer stand using 2x3 lumber. These brackets are strong, but they are not meant for large heavy duty projects. This design is based on many of these style brackets found in hardware stores, Amazon and in particular this design found on Printables (Shelving Unit 3d Printed Brackets, Rob Beast (All Things STL)).

You will need to print a set of 4 brackets for each "shelf". Put the brackets into the slicer and make sure you mirror 2 of the brackets. Slice at .2 layers with 5 walls and 30 percent cubic infill. This will take approximately 950 grams or just under a 1 KG roll of filament for each set of brackets. Use the same settings for the feet. If you use more layers and infill I recommend purchasing 3 KG filament rolls.

PRINT TEST PIECES TO ENSURE FIT WITH LUMBER BEFORE COMMITTING. You may have to scale up or down in the slicer

To build this particular 3D printer stand:
Get 5 2x3x8 studs as straight as possible (1 extra 2x3 is just in case). I recommend you purchase from the same store so they are basically the same dimensions.
Get a box of #8 x 1 1/2 inch screws. I used deck screws I found on Amazon.
https://www.amazon.com/gp/product/B0CGX1PXG5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

Cut 4 sections of 2x3's to 39 inches for the legs (Z).
Cut 4 sections of 2x3's to 24 inches for the front/back of the shelves (X).
Cut 4 sections of 2x3's to 20 inches for the sides of the shelves (Y).
Cut 1/2 or 3/4 inch plywood, particle board, MDF, or OSB into 24x24 inch squares. You could also use lumber like 1x4, 1x6 or 1x12 and make the tops.

Use the bottom shelf guide to mount the bottom brackets 3 inches from the bottom. Mount the brackets aligned with the top.

Because of the placement of the screw holes you have to mount the legs (Z) first then fronts (X) and finally the sides (Y).

I recommend using some industrial adhesive as well as the screws. Clamp each joint tight in both directions before putting in the screws so it will be square and with no gaps.

I used wood glue for the top and no screws but brackets, pocket screws or deck screws right through the top will work too.

I originally modeled these in Freecad. I'm still working on OpenScad customizeable files to enable making these for an exact fit for your particular lumber and with your particlar printer. There is variability depending on where you purchase your 2x3's. For this project I purchased the 2x3's at Home Depot.

I'm very happy with the outcome of printer stand. It is solid and does not vibrate with the printers going. I think if you can't get Ikea Lack tables this is a good alternative.