flex shaft extruder (worm gearbox)

flexshaft extruder, worm gear ratio 1:27, useing a nylon wormwheel(lower layer heights 3D printed wormwheel would work,such as 0.08mm layer heights),3D printed worm(0.08mm layer heights). and ,to make this work,you need other things under following lists.
1. 3mm flex shaft core + 4*6mm PTFE tube or another finished product.
2. 4X6mmX35mm stainless tube or titanium tube for the worm shaft.
3. 3X5mmX33mm stainless tube or titanium tube for the wormwheel shaft.
4. 4 of 6X10X3mm ballbearing
5.