LEGO gear flex shaft extruder (24T Gear)

use lego parts for the main gear.because it is easy to get ,high quality and cheap.
BOM

1.LEGO 24T Gear
2.LEGO Worm Gear with New Axle (32905)
3.self-tapping Threaded insert M3X6mmX3
4.M3X8mm screws X2
5.M3X30mm screws X1
6.M3X12mm screws X1
7.6X10X3mm ballbearing X4
8.5X8X2.5mm ballbearing X2
9.4mm flex shaft core + 4X6mm PTFE tube or another finished product.
10.M4X6mm Hexagon Female Brass Spacer X 2
11.8mm OD 20mm Long Mould Die Spring Yellow
12.9mm OD 11mm long extruder wheel.
13.5mmX35mm stainless tube or shaft for the worm shaft

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2019.12.25: update