Compact general purpose extruder

Superceded by http://www.thingiverse.com/thing:59352

I have been using my quikfit compact extruder for many months and prints and finally it blew apart tonight and fortunately I still had a spare but that is my last one and I really need an extruder suitable for hotter temperatures for nylon and ABS so this extruder will use an aluminium plate below the extruder to hold a J-head hot end. The alloy plate will remain solid at higher temperatures and should have better print quality for longer.

There are two versions here, one is just the extruder and idler and the other also has my 45/11 gear set for a complete extruder in a tray for printing.

When finished it looks very similar to the one in the photos on my OB1 printing out the new version.