Fits an eGo battery, but if you're able to print this, I'm guessing you're also able to modify it to fit your device. Purely non-functional, just makes your PV look like a pipe. I printed mine in blue ABS and painted it with acrylic paint and it looks great -- I just didn't have any black filament laying around.

This is the first version, I'm still considering optimal size and shape, but it really makes vaping feel like you've got a pipe.

I like to pop it on with the button facing either inward or forward. Makes for easier use. Enjoy!