If it's plastic parts, there's Bobitech in St Julien Chapteuil near Le Puy that does everything, 3D printing, RIM vacuum casting, injection in a prototype mold. Their design office works with Solidworks
Indeed, we find the main players in rapid prototyping, namely:
3D Prod, Initial, Materialize...
But none of these companies allows fast production (3 days) for all types of machined products (metal or plastic) at prices as competitive as Proto Labs.
That said, I take note of the following two contacts and will soon do the exercise to test them:
Although you respond late, if in the future you find yourself in a similar situation, you should know that the x3D Group company offers an online printing service that allows the rapid manufacture (express delivery within 48 hours) of functional mechanical parts of the material of your choice (plastic or metal) at ultra-competitive prices.