An adjustable drive block for Replicator for experimental use. Via a knob fitted to a screw, the pressure of the axial bearing against the filament can be adjusted and fine-tuned. This design does not need a metal spring and relies on the flexibility of the lever. Alternatively, it can use a rigid lever (supplied) and a small piece of rubber which is compressed by the M3 x 35 mm crew's tip. Two different lever shapes are supplied for testing between flexible and rigid modes. By Creative Tools Home - Things - GooglePlus - Twitter - Facebook - Youtube - Instructables - Instagram - Flickr - Vimeo - LinkedInPlease note that this is an experimental design to test different and adjustable filament grip pressures. It is not evaluated to perform better or worse than the standard extruder block. For instructional images please see: http://flic.kr/s/aHsjHC7f6H If you don't have your Replicator running or have access to the screws and bearing, get it at http://bit.ly/16bncdX