This is a derivative of the PanelMax Prusa - http://www.thingiverse.com/thing:21135 by TommyC. It adds a couple of small pots for LCD brightness and contrast, along with changing the size of the reset switch to small and low profile.

Quick video of it in action here:
http://youtu.be/6dPR84LiO9Y

The click encoder, pots and reset switch are mounted on a breadboard within the enclosure which has expanded to fit them.

As the name suggests it was primarily designed for Sanguinololu - it moves the SDSL card reader: www.reprap.org/wiki/SDSL from the ISP and top of the expansion header into the case and uses every other free pin on the expansion header.

Having recently built a Mendel 90: http://reprap.org/wiki/Mendel90 I am a convert to ribbon cables so this design uses a single 22 way ribbon cable from the expansion header+isp header to the enclosure. Obviously you can use a different connectors on the end to connect it like the PanelMax to RAMPS or other electronics.

Update - works with Printrboard, see: http://blog.think3dprint3d.com/2012/07/panelolu-with-printrboard.html for details

Check out http://blog.think3dprint3d.com/2012/06/panelolu-in-depth.html for more info

Kits available on emaker:
http://www.emakershop.com/browse/listing?os&l=301
and ebay
http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=m570.l2736&_nkw=reprap+panelolu

Detailed build instructions here:
http://blog.think3dprint3d.com/2012/06/panelolu-in-depth.html

UPDATE #3 - I have re-uploaded the files after tweaking the hole sizes and the strain relief. I have printed over 20 of these now and feel its time to take off the "work in progress" status

UPDATE #2 - Mistake in commenting meant the previous update did not have the hole in the prusa lower mount clamp - scad and stls fixed now.

UPDATE - If you downloaded the panelolu.scad or panelolu front_left.stl, I have updated the files due to an error that had the letters reversed and a couple of other problems that are now fixed.

The firmware changes required to Marlin to make it work are documented on this blog post:
http://blog.think3dprint3d.com/2012/06/sanguinololu-lcd-and-rotary-encoder.html

OpenSCAD file now available.

The knob is tommyc's adaptation of this: thingiverse.com/thing:17404