Frame for Polar M600 Watch Strap Buckle

I lost the metal buckle frame for my Polar M600. Luckily the pin and the prongs didn't fall off. Couldn't find just the frame anywhere for purchase, so designed and printed one for myself.

I'm fairly new to 3D printing (less than 1 week), and this is the first 3D thing I've ever designed. Only had white PLA with me so used that, but ideally would look nicer with silver metal PLA.

Edit: The v2 file is roughly the same as previous but I wanted the edge of the buckle frame to tilt down and si