well given that I already have a multishot, mechanical, self priming elastic band gun in my workshop, that I printed in one go - I'd have to say He's wrong :-)
http://www.thingiverse.com/thing:603697/#files
Just use my barrel adjuster and you can shoot any size elastic or loom band you like :-)
So quite why he's put something like this on kickstarter, is beyond me.
The harry potter wand designs are quite neat.
But in what way is this a kickstarter project ?
Guess he just wasn't looking very hard as it's been available since december 2014 :-)