use lego parts for the main gear.because it is easy to get ,high quality and cheap.i will provide all source files.
BOM
1.LEGO 40T Gear (3649/34432
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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
