Triple leadscrew belt driven bed for Hypercube

**update 2 22-12-18** I have tried adding a 10mm linear shaft to each leadscrew in the hopes that that would fix the z-wobble, it did not. I have now abandoned leadscrews and am going back to one of my previous attemps: a belt driven bed. I am leaving this thing up for anyone who wants to experiment with this themselves.

**update 1** A weakness of the current design is that the leadscrews are relied upon for keeping the build platform steady in the xy plane, which they are not meant for. The