Tandem T-Slim case

Remixed from original design by DonBroyles to make the case more rigid on the cartrige side and modified the clip to be able to slide-on the pump with lever to release. Also added button cover to lock/unlock the pump more easily.

**Case**
should be printed with TPU 95A with supports (I suggest removing supports while still warn on build plate)

**Clip**
- can be printed with PLA or ASA but I highly recommend PC for longevity.
- threads to case via the two holes on the back