On Tue, 16 Jun 2015 19:25:47 -0500, Tim Wescott
wrote:

I'm working on a project that may well end up having a case made of
fiberglass. As I'm working on a 3D model that will use mostly to make
pretty PDFs for my fiberglass guy and my customer, It occurs to me that I
could just make a 3D model of a mold and send it to a machine shop.

A 1.25 x 12 x 48 inch piece of 6061 costs $430 from Online Metals. Is
that pretty much what I would expect to pay for materials from a machine
shop? Is there any material that's significantly cheaper, that can be
tossed into a CNC mill and made into something mold like, and then hand-
polished to a high shine?

Eh, I forgot about Rayite MDM:

www.chavant.com/new_site/files/pdf/rayite.pdf

I don't think you can machine it, but it makes really good molds, with
extremely high accuracy. It may not be for this project but it's
something to remember for inexpensive fiberlass molding.

--
Ed Huntress