I didn't want to spend too long on 3D printing, and I had access to a laser cutter in the makerspace, so I exported the STL file to an SVG file using ThinkerCAD. I removed the triangles from the original design to increase stability. I left them in the file as I didn't want to alter the original design. However, they can easily be removed in Inkscape or similar graphics programmes if someone wants to.

The file I created is the image file, so you have to download that instead of the STL file.
The system does not allow you to publish this as a remix without uploading an STL file. It does not recognise the SVG as the 'model file'.