Schoolstuff

### This is an entry for the #backtoschool Challenge

Objectives:

* good functionality
* no sharp edges
* sufficient sturdiness
* use of a moderate amount of material
* acceptably nice look

### Ruler:
Since compared to 2D printers 3D printers have limited resolution it is intened to print the scale on paper or transparent foil and glue it onto the rulers edge with scotch tape. I've included a ruler vectorgraphic file (easily editable with inkscape). The rounded ends of the ruler are slightly elevated. They protude over the rulers thickness in the center area. Those protrusions are there to prevent the scotch tape from getting ripped off accidentally.

### Pencil Topper:
I suggest printing the pencil topper with three color-layers e.g. red black green so that the eyes and mouth stay black. Stick it onto your pencil and signal yes or no; good mood or bad mood when putting up your hand.

### Pencil Case:
Print it like a vase. Set the Wallthickn