This is the male part of a buckle compatible with Dainese buckles used in their body armour and back protectors.
Use with the female part here http://www.thingiverse.com/thing:1164007
I thought this part may be too weak to work but it actually feels very strong when printed at 100% infill.
This part needs support under half the base which worked fine but I have added a thicker version that doesn't need this.
Warning: This is not meant to be used as a replacement part on vital safety equipment

I've been looking for a easy-to-print, low-volume, low-profile snap buckle that would work scaled up to 4"... spope's swivel buckles don't scale, but the basic design kick-started my brain enough that I threw together this simplified parametric design which should do the trick (update: yup).
Update Dec 8/15: adjusted the post geometry for easier/stronger printing (tapers work better if they start a few layer off the build platform), tweaked the tooth design.
Update Dec 11/15: made customizable, minor tuning, cleaned up magic numbers

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