This is a magnetic pen rest for the Microsoft Surface Pro 3. The rest sits on top of the tablet and does not block the air slots or camera thingy on either side. It also does not block the magnetic type cover close/sleep feature. The rest works well to keep the pen in place even if you use the tablet as a laptop or move it from place to place. The rest can be removed easily and stowed for traveling. I really like my Surface Pro 3 but I am dismayed at the lack of places to put the pen. Sure, one can rest it on the desktop beside the tablet, but I've found that to be inconvenient and I sometimes mistake my surface pen for a real pen - it doesn't write too well on paper. ;) So I've been thinking there has to be something easy to do to make the pen more convenient. I like how the dock uses a magnet to capture the pen but I cannot justify buying the dock just for that. Plus, I wanted something small that I can take with me when traveling. I looked at the pen rests on Thingiverse and they are good solutions, but I wanted one with a magnet that I could put on top of the tablet. The magnet holds the pen in place under moderate movement and can even hold it in place if you turn the tablet upside down. However, the pen and rest are not fixed so vigorous, Etch-a-Sketch movement will dislodge both. But no one does that, right? :) Vitamins (1) 22mmx5mmx5mm magnet (optional) Note: I have designed the code to permit you to omit the magnet if you don't want to use one. The magnet will keep the pen in place when you move the tablet (rigorous Etch-a-Sketch movement will dislodge the pen) but the rest will work without a magnet for sedate use. Tips For best results, print the rest in its original orientation and use a raft. No supports are necessary. Instructions To assemble, insert the magnet into the slot. If the magnet is loose, use a bit of super glue to hold it in place. Then, place the rest on top of the tablet and the pen in the indentation.