Engineering Projects/MakerBot Improvement/printhead improvement

Problem

Printhead is knocking over tall objects, is clipping small pieces shooting them out of the makerbot. This is with rafts and support.

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  picture of Replicator 2 printing a bracelet ... can see two green pieces of the bracelet that were knocked off
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  Another picture of the pieces the Replicator 2 knocked off
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  can see the big ring of the actual bracelet with all the small tiny rings around it (about 30%) done at the moment

Here are three video's showing the printhead moving, did not capture any clicking noises. video1, video2,video 3

Implement

A Spring Loaded, constant pressure on the PLA may improve the printing. Need a hardware kit.

Theory of Operation

Looks like the stepper motor has plenty of pulling power, and that this device actually creates more friction, makes the stepper motor pull even harder, but the result is a constant tension above the stepper motor, which should lead to more constant pressure pushing the PLA through the heated nozzle.