A few different ways to join 1515 extrusions using printed parts. I have not used these in lieu of blind joints, but rather to supplement them. Each model has 2 or 3 different places to screw into a given extrusion. I've found that using the screw holes along the outer walls tends to provide the best sqauring. I probably wouldn't consider 

1515 Extrusion Joinery

T-Joint.step

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1515 Extrusion Joinery