Svans (M8 nut) - Reverse bowden bracket

# Features
- Secure a reverse bowden tube using just an M8 nut. No push-fit connector required.
- Threading the tube all the way through the bracket lets a short tailpiece receive the filament. This way the filament can safely enter the tube without touching anything.
- For tubes with 4mm od.
- Has holes to mount bracket to printer frame. Using M5 bolts and T-slot nuts for instance.

# How to print
- 0.2 mm nozzle with 0.1 mm layer height.
- Axis of screw oriented vertically, with supports. See image!
- Filaments of decent strength and some flexibility should work. I tried PETG and PC.

I found that finger tightening the nut is enough to secure the tube. Going further might crack the screw.