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The BfB3000 looks much more "well-finished" than the Rapman3.1.
The main differences that I can notice are :

• allready built up machine (no kit)
• much stronger metal structure
• metal angles rather than acrylic
• Z motor moves the bed with only one rod (no belt)
• each Y belt has it's own motor
• PCB is well protected
• extruder heads are more compact
• up to 3 extruder heads can be mounted
• filament reels are horizontal
• X, Y and Z stops are magnetic sensors
• printer is enclosed in an acrylic bounding box

The first thing to do after levelling the bed is to calibrate the 2 heads offsets.
It's an easy task. You just have to print a calibration file and mesure the distances in X and Y to find out what are the X offset and Y offset values. These values must then be used within Axon's profiles.

After that calibration was done, I decided to have a test with 2 different materials :
ABS for the printed part and PLA for the raft/support.
The object I plan to print is this one :


I found out that printing with double heads leads in much longer print time than with a single head.
That print took about 12 hours to complete (the object is about 15cm high).

Despite a warping excess at the tip of her knees and a few defaults, the printed girl looks quiet correct.
Here it is with and without the PLA support :



More photos...