Thank you GT22 for your links which are a great help to me.
The size of the pieces will be overall of max length 60 cm (and still I see wide), width 40 cm and depth 40cm
What do you mean by operational? Principle of being in motion?
Plastic.
By a very quick glance I would see this one:http://www.machines-3d.com/imprimante-3d-makerbot-replicator-5eme-generation-xml-351_361-873.html any advice?
These will be parts that will be used for blank assembly on racing cars.
I did a comparative study of polymer 3D printers for individuals.
After I didn't necessarily have the same constraints as you, mine being the printing of special filaments, printing volume, multi-material printing and of course the price.
The N2 from Raise 3D meets all these criteria, very high nozzle heating temperature, heated bed, very large print volume, two printing nozzles to print in multi-material (very appreciable when you need support..), and a good price.