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Here is a 3-Way Elbow designed to fit 1/2" Schedule 40 PVC pipe. It's part of a series of 1/2" PVC fittings I'm designing to supplement conventional plumbing fittings. The 3-Way Elbow can be used to make boxes and various other forms. My original purpose was a small, plastic-wrapped greenhouse to hold plants over the winter.

Please check my designs for other 1/2" fittings.

I put the triangular holes in the pipes to help the glue dry. On the first iteration, I noticed that being air tight prohibited drying. The ledges on the top of the horizontal holes make it printable without support structures.

Update 2015-02-02. I made the side fittings slightly more snug now that my printer is properly calibrated.