Rubber Band Glider

I downloaded https://www.printables.com/model/1133387-fun-rubber-band-glider-4g and got an error from my slicer – it looks like the bottom of the model wasn't completely flat. So I went back to the original ( https://www.printables.com/model/70680-one-piece-printed-glider ) and added a simple hook for a rubber band at the front. This is the first time that I've tried to launch a model like this via rubber band vs. just throwing it – much better performance.