Amadon's Prusa i3 - Wilson hybrid complete printer

EDIT 6/6/16 Added new version of the idlers for the chimera/cyclops extruder. These new idlers have support for the bearings on both sides so it can't bend over and lose clamping pressure on the filament.
There's a 0.4mm thick support material built in that you must cut out. No support needed from your slicer. Use a washer on BOTH sides of the roller bearing. Low profile nut of course. The flat side of the idlers should face towards the motors. Slightly raised sides towards the center.