A smart holder for your Arduino UNO.
Easy to assemble, just push the two hinge/bracket in thier holes in an open position, and then fold them down to lock them in place. 4 washers are used to hold the card in place with a small self tapping screw approximately ~1,2 mm in diameter. I use exactly these screws: PIKO A 55298
An MEGA2560 holder is olso available here: Arduino MEGA2560 Compatible Holder
If you only need the model and like to print it yourself, you can get the model here: 3D file