I wanted to take the TANK and make it taller/longer. I stuck it in TinkerCAD. Here is the model. I broke the capsule itself into 3 parts. Currently in the model it is joined, but you can remix it and pull it apart. Just resize the middle part to whatever length you want, and put it back together.
https://www.tinkercad.com/things/5Qk5hZJY9wq
the photo included is just an example of the orginal. I haven't finished printing my larger one yet.
The author remixed this model.