I've had a look at a sample of 4 of my models -
a) Open wagon body with underframe in situ, printed 'right way up' - 16% cheaper
b) Tank loco body, printed 'right way up' - 37% more expensive
c) Carriage body without roof or floor, printed 'right way up' - 67% cheaper
d) Van body without roof or floor, printed on it's side - 37% cheaper