Just got these today from Shapeways.com.
I ordered 2 of the keychain and the detail is just awesome. I still need to add a cable or something through the loop.
The map export required quite a bit of work to correct some non-manifold connections and the Map Exporter treats doors and platforms kinda funky, but I think I sorted them out.
I don't think I'll be doing any more any time soon. Though it does look simply awesome. Doesn't sit flat though, it'll need a stand :)
Fortunately, the 5-D portions weren't an issue for printing as I feared after submitting.
I ordered during a 66% discount on the black material, otherwise it'd be a bit up there.
I've been playing around with a version that includes text on the side. Must ... resist ... spending ... money.