It's about as useless as it gets. The included plans are for cutting a useless machine from 3.8mm 3ply wood on a laser cutter. See the instructions below for customizing the laser cutter output file. If you've never seen a useless machine, hit the link below: https://www.youtube.com/watch?v=fL7p87y9xQY&index=26&list=PL5684E54C1D0B97D7Useless Machine === Preparing This useless machine is ready to cut on 3.8mm plywood. The DXF in the zip file includes complete plans that can be sent to a laser cutter. Tiff files for the artwork shown in the photos are included in the zip file (/tiffs/). The servo driver circuit includes a PDF on both letter and A4 paper for etching. A complete list of materials is also included. Customizing If you would like to adjust the dimensions, use different thickness wood, a different servo or hinges, check in the .zip file. The box dimensions live in the useless_machine.scad file. The toggle, microswitch, servo and hinge can be found in the libraries directory. The useless_machine.scad file has an option to render the box in 3D; use the 3D mode to view the placement of parts and check dimensions. Use the 2D mode to export a DXF. The most important dimensions to consider changing are as follows: Construction Mount the servo and circuit board to the center panel a. Use M3 bolts and the round spacers to stand the circuit board off of the center panel. b. glue head to pusher arm c. use 2mm wood screws to attach the servo horn to the pusher arm; NB you will probably have left over round spacers and catch spacers. This is normal. Extras were included to account for errors and loss. Credits Servo driver derived from: http://www.555-timer-circuits.com/servo-tester.html The external artwork was created by Patti Ciuffo. The awesome raven was created by Rones: https://openclipart.org/detail/173513/raven-by-rones-by-rones-173513