Update 2014/07/09:This is a new version, smaller, lighter, stronger, more reliable than older versions. Installation is unchanged. It is critical that this part is printed in a material with great layer bonding properties, otherwise the bosses will split.This setup is significantly lighter, smaller, and easier to maintain than the stock hotend, and probably any other aftermarket setup as well.  Clogging has been nonexistent. Z build height has been increased. Ringing should be reduced. Wobble due to linear bearing play should be reduced. Complex assembly and disassembly routines are a thing of the past.  Notes:- The UBIS is a thermistor-based design, which will mean adding a 4.7k ohm resistor to R23 on the main board and changing your firmware slightly.  - There is no provision for a fan mount, because it is intended to work with a crossflow fan as suggested by [foehnsturm on the UM forums](http://umforum.ultimaker.com/index.php?/topic/2839-the-physics-of-cooling/?p=24211).  - The hotend clamp is tightened with four #2 x 0.5" plastite screws (http://www.mcmaster.com/#99512a162/=pw83rw).