Nice one. Unfortunately it’s about 3 hours late for me - I just bought the polar pro filters and their removal tool was the tipping point (I even searched thingiverse for a tool just like this). This tool actually looks like it’ll help more in the removal and mounting of filters, so I’ll still try printing this.
I am sure lots of people will find this useful and it’ll give people more confidence to buy your filters
I imagine Fstop labs will have them for sale soon, since they look to be into that sort of thing Until then www.shapeways.com is an easy way to print them (fstop labs could also sell them through that site if they wanted to). I'd probably print this in Versatile Plastic (a processed variety - whichever colour you'd like) or perhaps Fine Detail Plastic (it will be very accurate then so shouldn't need any sanding, the cheaper version should be fine - a benefit of this material is that it will be semi-translucent as well so you should be able to make out the lens behind it)
In Australia you should also be able to print them at Officeworks in some cities. I imagine there are other 3d printing services local to many countries & cities too
As far as I'm aware, 3dhubs have a service where you can upload the STL files in the OP to have them printed out and sent to you: 3D Hubs: Online manufacturing
You can also print them online from the link in the OP.