This is a 9mm speed loader I modeled around the Sig P320 magazine, I haven't tested it with other manufacturers yet but I think it will work well with just about any double stack mag out there.

It's printed in 2 pieces to maximize the strength of the post, and make it WAY easier to print.
I left enough room in the bottom of the post slots ( the 2 holes in the main body ) for some super glue, although I've found they lock together fine without it.

To assemble, simply align the holes on the post and the body and push them together on a hard table. ( it should take a bit of force to go together )

Please leave a comment with what you think. Thanks!