Prosthetic Hand Attachment : I Phone Holder

Hello all!
My name is Rachel Thompson and I'm an engineering major at Seattle Pacific University. I designed, modeled and 3D printed this "thing". It's a prosthetic hand attachment which allows amputees to hold a cell phone with their prosthetic hand (designed by SPU). My design has two main parts, the bottom piece which anchors into the prosthetic hand and two elongated arms which slide into the other part- the top piece. Together the two pieces can hold a cell phone with the aid of a rubber b