In keeping with Kludgemonkey's wishes (http://www.thingiverse.com/thing:13826), this is a remix of his Bottle Cap Start that adapts a bottle cap to a piece of 1/2" PVC pipe. I used it to make the HowToons Stomp Rocket from MAKE Magazine volume 42. Instead of duct taping the bottle to the PVC pipe, the bottle screws onto the adapter, which fits on the PVC pipe. This way the smashed bottle can be unscrewed, reshaped, and reattached with ease.Printed at .3mm layer height, one shell, on a MakerBot Thing-O-Matic with an MK6+ extruder and Sailfish firmware. 3mm ABS MakerBot filament. There is built-in support in the center of the adapter that I easily removed with a pair of needle nose pliers. I wrapped duct tape around the PVC pipe three times to give the adapter a snug fit on the pipe.