i think ana was being sincere and not trying to offend.
it makes sense that they would need money to hire people to get the stuff to us on time.
your customers will not necessarily have to pay the shipping that you are paying. if they live in the US, they will pay 6.50. and people ARE used to paying additional for shipping. when i resell on etsy they pay $5 domestic and $13.40 international. that said, SHAPEWAYS YOU REALLY NEED TO FIND ANOTHER WAY TO SHIP.
too many of us have been burned too many times by UPS. i personally love my delivery guy, but i've lived in other places where i received godawful service. plus UPS customer service on our end is really awful. i realize that as a major customer you probably get great customer service. but it doesn't work that way for the rest of us.
ana et al: i still think you should look at the ponoko prime system. i pay them a monthly fee to get lower prices, quicker turnaround, and free shipping on orders over $100. it may not always work out in my favor in the end, but it's psychologically much easier. and it ensures that the most dedicated users get the service they need and remain happy without destroying your bottom line. plus you get a certain bulk payment each month that you can depend on regardless of orders.