So which &#x27;parts&#x27; are actually printed?  I cannot believe that the turbopump blades could possibly be printed additively as they would lack proper crystal structure.<p>Piping can be printed, but given the stresses at attachment points, I cannot see that printing pipes would save many man-hours.<p>The turbopump casings could certainly be printed, but not in &quot;one piece&quot;.  Someone needs them open to insert the bearings and blades.  So two pieces at best ... exactly as if they had been milled rather than built additively.<p>So what&#x27;s left?  The combustion chamber and bell might do well.  They have some internal voids&#x2F;plumbing that probably suits such printing.  But the stresses?