If you are using a low-volume, low setup-cost process like CNC or 3D-printing, then you have to consider the higher cost per unit (marginal cost) due to the time spent on the machine. You are paying rent on that expensive machine, and the time your parts take to build are directly correlated to that. Divide your engineering costs and other fixed costs over that small number, and you have a really expensive product.
Buying 30 parallel setups (or even renting them) becomes prohibitive very quickly (how many machines can you buy, or rent time on, who will operate them?)
A high-volume process has high tooling charges (molds, die cutters, etc.) for faster processing times (less time renting the machine per part.) But it will never be more expensive in the long-run unless there is something very peculiar about the geometry of the part being made. If that is the case, you have a problem and should reconsider what you are designing and/or doing overall.
Considering the expected volumes, this should have been considered from day 1. If the break-even on this was beyond a few hundred units, then something is very wrong and it was doomed from the start.