Found a few sites/companies that manufacture difracion gratings. I should contact them and get some samples. http://worldstartech.com/products/description/60/index http://www.lasercomponents.com/us/product/pattern-generators-for-flexpoint-laser-modules/ http://www.edphoton.com/Other%20Standard%20DOEs%20English.htm
Looking to make some 90deg gear trains, and wanted to know how much force 3d printed heard could resist. After printing some gears, a holding
Some interesting and some common ways to make 3d parts stronger. http://st3p3d.com/blogs/3d-printing/14992261-a-few-ways-to-strengthen-3d-printed-parts