Prototype: Coyotech Hopper Mk 4

This is a failed attempt at a 3D-printable wye for usage on a Nerf blaster.
Like store-bought wyes, the hopper goes into the angled slot, the stub goes into the slot below the hopper slot, and the barrel goes into the remaining slot.
The STL with "half" in the name is a cutaway to show the design of this thing so you can tell me if you think it'll work.
DAE files are opensource CAD files that I can export with Sketchup.
Changelog:
Mk 4: Area for dart to drop into added.
Mk 3: Curves smooth