These snaps are super tiny but still very strong. They can be scaled up to any size. It's easy to embed them into different parts for connecting all kinds of things. I use these in my Deer in Snow tealight model.

Notes:

• When scaling, be sure to scale Both parts in ALL directions (X, Y, and Z).
• If you need to make them slightly stronger, you can very slightly scale down the cup (on X and Y axis only). Or scale up the inner part (on X and Y axis only).
• The plate has 3 snap pairs. They are the same, but with different bases. The larger one is scaled to 150%.

To embed snaps into parts:

Cup: Embed the cup so that the top rim of the cup is flush with your surface. Then use Boolean Slice. And delete the inside of the cup created by the Slice. 

Inner part: Embed the inner part so that the base of the prongs is flush with your surface.

I've tried other models of snaps, but they were not as strong when scaled down to this size. (It's amazing how strong such a tiny snap can be, even in PLA). It only takes 14 minutes to print all 3. So give it a try!

A Step file is included for folks using CAD.