About this 3D model

I have friends with this device and I really like the FitBit Wrist Strap by BSchuler, however I am having a lot of trouble with the printed band (both in nylon and PLA). The little pins either won't pop in or won't stay anchored. So, knowing how rough I and my friends tend to be with this kind of thing (especially when running), I decided to make a variant to work with a velcro strap. Pictured are two versions, nylon and PLA.