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Summary This is a tour de force #backtoschool set! Make a very fancy Ruler to the exact specifications you want. The pencil case opens to reveal the heart warming Geneva Mechanism! And who does not want a trapped sphere pencil topper. I do so I made one. video here of box http://youtu.be/cQUxT1wyrOY also to help educate your friends and family, best I have found under 2 minute slightly amusing, simple & straight forward explanation of home 3D printing, (made by and for schools): http://www.youtube.com/watch?v=YpHv19jdloI Instructions --the ruler is a .scad file, you can make pretty much any ruler you want, key chains, normal rulers, sample print swatches. i took this file far beyond the basic one Stu121 started me off with. -- the pencil case was made in tinkercad, then I added a secret to the inside of the lid using Geneva mechanism from jessed, I improved pins and spacing of the original. -- pencil topper is a simple add on to the file from liefting Printed these in PLA 0.2mm layer height, 20%fill, wall=2Xnozzle (in this case 0.7mm wall since I use the MakerGear M2 with 0.35mm nozzle)