Tarantula Belt Driven Z axis

A simple and inexpensive way to get perfect prints, first time, any time ! Forget useless printed brackets and dual lead screws : a belt driven system is the way to go, definitely.

BOM :
1x GT2 20T pulley
1x GT2 20T idler pulley
1x GT2 80T belt loop
1m GT2 6mm belt
1x M5*30mm Hex screw
3x M5 grover washers
1x M5 Nylstop nut
2x MF105 bearings
1x 6mm bronze spacer (or a stack of washers)
4x M3*10mm DIN912*
8x M4*10mm button head hex screws*
8x M4 T-nuts for 2020 6mm aluminum profile*
1x Nema17 motor (17hs4401 recommended)*
(*)Reclaimed from outdated Tarantula z-axis and extra spare parts in the kit

Assembly video : https://youtu.be/IgWcZoRDe20

The mounting for the E3D Titan + V6 + 5015 fan can be found here : https://www.thingiverse.com/thing:2624164

June 3th 2018 : I recently had a talk with a maker who experienced a small fall of the gantry at the end of the printing sequence. Here was my answer :
"When the holding current of the Z motor is turned off, the g