Just got my belt clip for a 60mm foam ball...which just so happens to be what I paint into my cosplay props! I was trying to think of how to attach pokeballs in such a way that they would be accessible but secure. I was thinking "real trainers" would need them to be quick draw. This belt clip is secure around the mid-section of the ball but light weight and flexible. I love it. http://www.shapeways.com/model/988113/60mm-foam-ball-belt-cl ip.html
The only downside is the print price is around $9 each in material. I am not sure how to reduce this any to make it cheaper but still as secure. Any thoughts?