At work we’ve got a 3D printer. In this series of posts I’ll share some of the designs I’ve made.
![Three whiteboard stuck in the write angles cube at right angles.](https://aperiodical.com/wp-content/uploads/2019/11/img-0022.jpg)
This is one of the first ‘proper’ things I’ve designed – I wanted to have a go at making something based on an object I already had. A colleague asked if I could make some props to explain coordinate systems, and I was holding a whiteboard pen at the time, so I decided to make a set of orthogonal axes out of whiteboard pens.
![3D rendering of the write angles cube. Each face has the shape of a pen lid cut out of it.](https://aperiodical.com/wp-content/uploads/2019/11/94b643682febbc74fcea46a988d325c2_preview_featured.jpg)
We use Unique brand whiteboard pens, which have nice lids that slot onto the back of the pen while you’re writing. All I had to do was make a shape that the lid can slot into, and put it on the faces of a cube.
I measured the radius of the pen lid, and the sticky-outy bits down the side, using a ruler. I assumed that the people who designed the pens had rounded off to whole numbers of millimetres, and I think I was right.
You can download .stl and .scad files for the write angles cube at Thingiverse.