umo mod: z fine tuner v1.2

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Design Notes: Inspired by http://www.thingiverse.com/thing:126716, thanks to mooncactus! Advantages over the original: No drilling required! More stable rail profile Compatible with "motor corner" The spring fixes the screw but allows for easy adjustment without excessive resistance. Print Setup: I recommend 25% infill, 0.8mm wall thickness, and 0.15mm layer height. Assembly: Take the screw and nut from the toggle fixing and insert the nut into the slider. Insert the slider into the main part (note: two different sides exist; place it with the marking "B" facing the wooden back panel). Now place the holdfast in the main part and secure it with 10mm screws from the left and right. Take the M3 toggle fixing screw and attach the little thumbwheel to it. Remove the thread on the upper part where the spring goes (otherwise, the spring may scratch the thread). Place the spring (optional: use a lighter or ballpen) on it and insert the screw through the holes in the main part, the slider, and the holdfast. Push the screw downward until sufficient tension is achieved in the spring and secure it with an nylon lock nut at the bottom. Mount the assembly to the backside of your Ultimaker using a 12-16mm screw (or two) from the inside. Place a piece of cardboard between the z-endstop and the back panel for some distance, then tighten the endstop with 25mm screws (just a little!). Remove the cardboard afterwards.