A simple arthritis aid to help with typing. The approximate plastic cost was $1.48 using filament that costs $20/kg. The OpenSCAD source code is made to be easily customizable for individual hand sizes. It was made to print in two halves and be glued together in the middle, thus requiring no support material.
This was made to compete directly with a typing aid that is already on the market and significantly reduces the cost and complexity of use. See the below competitor with a retail cost of about $32.