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. . 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. . I will continue to add new fittings to the series and share them as a derivative of my original 3-Way Elbow. Please let me know if there is a fitting you need that I haven't created yet. . You are highly encouraged to make new derivatives. Please tag your new creations with #HalfInchPVCFittings. . Update 2015-02-02. I made the side fittings slightly more snug now that my printer is properly calibrated.