2016-03-17 UPDATE:

• Dual extruder version!
• Prometheus v2 hotend support (untested, set "prometheus=true" in scad to generate proper STLs)
• Rearranged stl files

This is a simple compact mount for E3D v6 1.75mm hotend with direct extruder.
It was designed to have the following features:

• Minimal footprint to provide the largest possible print area in all dimensions.
• PTFE tube extends right to the extruder gear, as recommended by E3D.
• Flexible filament support
• Built entirely in OpenSCAD. Highly customizable and parametric.
• Can be configured for the parts YOU have: use any drive gear and any small bearing. Just set the proper dimensions in the header.
• Compatible with both standard "rework" X-carriage and Geeetech version.
• Multiple mounting holes for fans, sensors, lights, etc.
• Easy maintenance: hotend and extruder parts can be removed or replaced without disassembling the entire thing

Part list: (for single extruder)

• Some PTFE tube, if it didn't come with your hot end (2mm ID / 4mm OD)
• 2 x M3x40 screw
• 3 x M3x16 screw
• 2 x M3x20 screw
• 1 x M3x10 screw
• 1 x M3x5 flat head screw
• 1 x M3x12 or M4x12 or M5x12 screw (depending on bearing type)
• 1 x 4mm OD / 3mm ID / 12mm long brass tube (optional, can be disabled in config)
• 3 x M3 nut
• 2 x M3 washer
• M3 thumb nut for spring tensioning (or two nuts and a wide washer, or M5x10 internal hex bolt like in Geeetech MK8 extruder)
• MK8, MK7 or other drive gear
• any bearing with 3-5mm ID, 9-16mm OD and 3-5mm width (603, 623, 624, 625, MR104...)
• spring with 8-10mm diameter and 15-25mm length
• 5015s cooling fan for PLA

This is a work-in-progress. So far I've only tested it with 624 bearing and MK8 drive gear. Any comments and suggestions are welcome.