Simple sliced Wade's Geared Extruder

Yet another extruder design, but this one is designed to be built with simple tools for tightfisted repstrappers like me, who want to build it themselves, not just buy it. It's about the journey...

You know how it is; you're building your RepStrap and there's very few ways of building the extruder; you have to buy parts that you can't re-use when you print a Mendel, or use a compromised design in the knowledge a new extruder is about the first thing you're going to have to print before your l