Loop for the Snowball maker by EunchanPark

I printed the excellent [Snowball maker](https://www.thingiverse.com/thing:1938893) cups by [EunchanPark](https://www.thingiverse.com/EunchanPark) but wanted to keep them attached by string to reduce possibility of a cup getting lost while the kid is in the heat of battle.

This is a simple design to add a small loop at the end of the cup that you can tie some string to. I've included the SCAD file if you want to tweak it any further.

NOTE: Print one loop first to test dimensions and scale up or down to get it to fit snugly in the hole at the bottom of the cup.

The loop should be printed flat. At .4 nozzle width I printed with 5 perimeters to make a solid object.