MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I made mine out of low density foam (I used foam from a camera travel case). Squeeze down a half inch thick piece of foam with a suitable diameter socket and run a sharp blade around the perimeter to cut. I used a sharpened piece of tubing to cut out a central hole for the valve stem. See photo under "Made" tab.