Want one of those Spacepilots, but cannot afford it? The handrest is designed for increased comfort, and fits the "space navigator for notebooks" 3D mouse.There are two versions of this handrest. A onepiece edition, and a twopiece edition. I used a flexible PLA for the black inner part where the hand is in contact with the handrest. Bear in mind, there is 0mm tolerance between the parts. As mentioned above, this thing is only compatible with the "space navigator for notebooks", and simply snaps onto it. I plan to make one for the original "space navigator", but i gave to get hold of it first. I really recommend this product to anyone who is annoyed by the 3D mouse's ability to stick to the table. Printed on a Ultimaker, sliced in Cura. Heated bed is crucial, as the shape is prone to warping. material: PLA, flexPLA 0,1mm layers or less 50% fill