Production-side Decoupled Z-stage

This is an extension of Twotimes\\\' wobble arrester ( http://www.thingiverse.com/thing:2151 ), and Bophoto\\\'s floating-nut arrester ( http://www.thingiverse.com/thing:3052 ).

Basically, this takes Bophoto\\\'s floating-nut idea and pushes it to the production side for a fully integrated floating Z-axis. When used with the integrated Z-rod ( http://www.thingiverse.com/thing:3755 ), you have a complete Z-axis stabilizer that could be implemented pretty much as a stock feature of the cupcake. For example, if you plan on cutting your own panels (or having them cut), you can substitute these for virtually the same cost and have an out-of-the-box improved Z-stage. The only thing you\'d need to make specially are the Z-bearing guides, and those are easy to make even if you have no machining skills (like me), or can be printed.

Additionally, if these parts are fully fastened (like the Z-guides are on the stock makerbot) they function exactly as the existing guides do, so you can al