Yet Another Bottle Opener, Customizable

What it is
---------------------
A Bottle Opener that is
* easy to print (No support needed)
* designed to dent the bottle cap in the middle for easy opening while being as small as possible
* using a coin to avoid that the opener is damaged by the bottle cap
* having the coin press-fit into the opener, no glue needed
* designed to be held with either the index finger or the thumb
* either attachable to a key chain or can be printed without the key chain holder
* flexible with a fully c