I am still designing this my 3D pen was crap and a waste of money IDO i will be better off melting zipties or using a heat gun on plastic wrap. I found out how to swap the middle mouse button with the left click I can add a toggle switch to do that on the fly but that might be too large. I am also considering allowing the light sensor to rotate or finding out the wiring to try to rotate the xy to yx so that left will be up for comfort. Rotating it manually seems tobe the best option and requires not extra hardware.