Red world builders

I am designing 3d printed useful products which I think it will help them in building and repairing device, I have made a utility belt and braclet screw driver holder.Screw driver bracelet will build with plastic because of light weight and which screw driver's bits and indicated handle it will build up by metal because it can durable.Why we are going on Mars because NASA is sending people on Mars its a part of NASA space app challenge. "" My challenge is to make 3d design for them.