Speed and material optimized hydroponic tower

Here is a modified version of boundaryconditions awesome hydro-tower, thats a remix of archipelagourbanfarms awesome hydro-tower.

Everything is compatible with the original tower!

Changes:

- Modified the clearances to allow for a easier assembly on areas that are not needed.
- Optimized the overall model for printing speed and material saving. With the right settings, you need less than 9 hours and about 196g of filament. That's five planters from one spool instead of four!
- Thoroughly removed everything that is not needed to save filament.
- Added chamfers to reduce elephant foot effects.

Recommended print settings for the planter:

- NO infill (It will be walls only in most areas, anyway)
- Wall Line width: 0.44 (this is important, since all walls are multiples of this)
- If you want, you can increase the line width to 0.48 for the surfaces
- Wall thickness: 1.44 (3 walls)
- top / bottom thickness: 1.8
- Anything else: Your tuned setting