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After single head version, Micron releases the dual head full metal high end extruder.



The main advantages of Micron's dual head extruder are:

• Easy nozzles height calibration: Unclamp the "DFGNM" locking screws, lower the 2 nozzles to the flat printing bed and lock again
• Innovative "all metal" hot end features a detachable filament guide and nozzle module "DFGNM"
• All metal design enables working with polycarbonate at 280- 300 degrees Celsius and with future materials that require higher working temperatures beyond those supported by plastic extruders and hot end.
• Reliable design: enabling strong filament gripping by using high torque 1:13 gear motor and stainless steel 303 hobbed gear with special teeth profile.
• Continuous idler bearing preload adjustment using 2 set screws.
• Easy opening service doors that does not change idler springs preload, while opening and closing the service doors
• Smooth filament feeding design that prevents the filament from being stuck after passing the hobbed gear.
• Tested with PLA, ABS, polycarbonate, nylon and PVA.
• Priced at: 469.95 USD

Technical specifications:

• Electrical:
• Motors: Nema 11 Step Motors.
• Rated current/Phase: 0.67 Amps
• 6.2 VDC :Rated voltage/Phase
• Fans: 40x40x20 size, 12VD 
• Heaters: 12V
• Thermistors: 100K ohm NTC thermistor

• Mechanical:
• Nominal Distance between the 2 nozzles is 46mm but required fine calibration 
• 1:13 Planetary Gearbox
• Materials: black anodize Aluminum, Stainless Steel and Brass.
• Filament size: 1.75mm
• Nozzle size: 0.35mm and 0.5mm
• Total weight:900 gram

Here is the post about single printhead version:

Technical specifications:

• Innovative "all metal" hot end features a detachable filament guide and nozzle module "DFGNM"
• All metal design" enables working with polycarbonate at 280- 300 degrees Celsius and with future materials that require higher working temperatures beyond those supported by plastic extruders and hot end.
• Reliable design: enabling strong filament gripping by using high torque 1:13 gear motor and stainless steel 303 hobbed gear with special teeth profile.
• Continuous idler bearing preload adjustment using 2 set screws.
• Easy opening service door that does not change idler springs preload, while opening and closing the service door
• Smooth filament feeding design that prevents the filament from being stuck after passing the hobbed gear.
• Tested with PLA, ABS, polycarbonate, nylon and PVA.

Electrical:

• Motor: Nema 11 Step Motor.
• Rated current/Phase: 0.67 Amps
• 6.2 VDC :Rated voltage/Phase
• Fan: 40x40x20 size, 12VD 
• Heater: 12V
• Thermistor: 100K ohm NTC thermistor

Mechanical:

• 1:13 Planetary Gearbox
• Materials: black anodize Aluminum, Stainless Steel and Brass.
• Filament size: 1.75mm
• Nozzle size: 0.35mm and 0.5mm
• Total weight: 440 gram

Installation:

Manufacturer can provide solid models of the extruder assembly and reference design for mounting plate
Micron 3DP extruder is priced at $289.95

Update:

here is the dual head version:

http://diy3dprinting.blogspot.com/2014/01/micron-eme-ltd-dual-head-full-metal.html

It is claimed in the description of the video (from 2012) that it is the largest ceramic 3d printer in the world with 80 X 80 X 80cm print area. It was built on H.I.T Institute (Israel) by Eran Gal-Or. It can be used to print ceramic, porcelain and glass objects.
































Source:

http://www.youtube.com/user/erangalor?feature=watch