I make great use of 3D Printed parts in my model ship building. Some of the generic parts can be found here.
Please note: Shapeways (not me) handles all order fulfillment steps: payment, manufacturing to order, and shipping. Please address any customer concerns to Shapeways... but please contact me if there are any issues arising from the part design, or I might not otherwise hear about it.
Also please feel free to contact me with questions about the items you see here, or requests for anything additional.
Thanks for looking!