1/2" PVC Bottle Cap Adapter for Stomp Rockets

Adapter from PCO28-2810 bottle cap to 1/2 PVC outer diameter (0.84") for use with e.g. stomp rockets . I found a couple of other models but ended up remixing one of steffanders lovely thread models to exactly what I wanted. This model is designed to print without supports when printed with the threaded (bottle) side up. Printing in PETG produces a nice strong part. I haven't tested water-tightness between this and a bottle but it seems like it would be at least mostly watertight. EDIT v2: The “_loose/_tight” versions of the model refers to the fit on the PVC only, not the bottle. I found the “_tight” version to be best but I've included the “_loose” version for printer variation. I've also lengthened the necked down area for more surface to tape the adapter to the PVC. 2 Liter Bottle to 1/2" PVC Pipe Adapter and 2L Bottle to 1/2" PVC Pipe Coupler were inspiration for this. Category: Engineering