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 :

Woman sculpture in SU
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 :

BfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculpture

More photos...
BfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculptureBfB3000 Woman sculpture