Back in 1980 my grandparents bought me a toy - "Little Van Goes" by Tomy. This was a bunch of plastic plates that had raised images of van parts. You could combine three plates in a holder, put a piece of paper on it, and rub with a crayon to make the most awesome 70's vans you could imagine. There were others of this type of toy, but pretty much entirely fashion oriented: Fashion Plates, Barbie Fashion Plates, etc.
Thirty-two years later I decided to make my own version of those types of toys, but this time as there is a community of makers, together we can overcome the problem with the originals: lack of variation in plates!
Now we can design as many plates as we want: sleepy robot eyes, rabbit mouth, pig nose, googly eyes, parts made from kids' drawings, ornamental parts, ABCs, and so on!
Read more of my thought process and story here: http://wp.me/p2hTaI-K
base.stl -- This is the main piece you'll need, and the longest to print. This holds up to three plates securely and allows you place a piece of paper overtop and rub with a crayon to get the image.
crayonholder.stl -- This is a piece to hold a crayon. It's not needed, but makes it much easier. You'll need to remove the paper wrapper from the crayon to be able to do rubbings (this piece is sized to not fit a crayon with wrapper still on)
topper.stl - This optional piece was made to help hold the paper in place over the base and plates. However, since you can't see through paper, it is hard to align and use. If you do use this, you'll need to cut the crayons to the length of the crayon holder, otherwise it won't fit in between the walls of this piece.
Plates - print as many plates as you want!
blankplate.stl and blankplate.skp - Use either of these blank plates as the base for your own plates! Simply add a design to the top of the blank plate, extruded to 1.6mm. I used line widths of 1mm to get a good image, but you could use other sizes if you want. Filled areas work good too.