Great work, and if the spools continue to be $50 I definitely would want one. However I don't think the spools are $50 because they cost $50 to make, they probably cost $1 to make. It's the razors/blades or printer/ink cartridge business model. I'm sure all the 3D printing companies are making fat profits off the spools of plastics, and this will push those prices down a bit.