See https://www.thingiverse.com/thing:5727749 for the model this is meant for. I didn't feel like waiting to order the glass flasks, so I threw this together quickly to print out of transparent PLA. Unfortunetly is has way too much overhang to print as a vase, but here is a link to the design using Onshape to customize.
| Flask-narrowed-neck.stl | 2.2MB | |
| HollowFlask.stl | 3.3MB |
