Updated aerial of FBR HQ 24th of June 2018, page-342

i read you need a entire cement truck standing by to fill a silo with compressor with cement so add another 100.000 to the cost, so it's more expensive then a hx and builds a structure ready to crack, plus you need to dismantle and build up the entire contraption....indoor ...on another spot including bringing the cement silo with you to print on another spot...... might as well put that 3d print nozzle on a truck boom....then you need a stabilized truck boom ... fbr got them beat and patented worldwide

fbr already has a patent nozzle that can spray cement but they ditched that idea because using cement was a dumb idea.