## GD&T https://www.drafterinc.com/post/why-your-dowel-pin-doesnt-fit--and-how-to-fix-it https://www.engineeringtoolbox.com/friction-coefficients-d_778.html https://www.tribology-abc.com/calculators/e3_8.htm https://www.mcgill.ca/engineeringdesign/step-step-design-process/basics-graphics-communication/principles-tolerancing ## Injection Molding https://www.fictiv.com/articles/injection-molding-tolerances-an-in-depth-look ## Casting ## Machining