Inside corners that result in a radius are a commonly overlooked issue when designing a part for machining. As of yet, there isn’t a magic way to cut a corner on a CNC router with a sharp 90º corner. We have some great solutions for this.
Core77 published a great list of ways to lower the cost of your CNC parts. While they describe machining metals most all the concepts are applicable to other materials. We thought it was too good not to share