I was discussing different bowden/direct drive options with my friend over on the RoBo3D forums and he had the idea of using a flex shaft, like this: http://www.dremel.com/en-us/Attachments/Pages/ProductDetail.aspx?pid=225-01 as a way of having a direct feed system without the weight of the stepper motor on the carriage itself.
In principle the idea makes sense. Obviously I have my concerns, but has anyone heard of this being done?
I figure the major limitations are:
- Lack of torque and or torsion buckling
- Rigid line causing issues or limited motion of travel
- Awkward mounting