I am coming late to the game but found a website that was very helpful: http://www.toybuilderlabs.com/blogs/...ume-and-length. I took and calculated the volume of the filament in mm. then converted it to inches and divided the cost of the filament role by the volume to get the cost of 1 in^3. then I calculated the volume of the part to find the approximate cost of a solid print at a given volume. Obviously this can be done cheaper by using an infill vs. solid. I do have an excel worksheet I created but do not see how to attach it here.nbonds@madisonhighlandprep.org email and I will send it to you.