This is a 3D printed version of the original Tetra’aide. You can find more details about this project on this page (French): http://bdemauge.free.fr/tetraaide.pdf
Basically, this allows students to show to the teacher and other students where they are with their activities. It can be green (smile) if everything goes well, to red (sad) if it goes wrong, question mark for a question, or handshake if help is needed.
I redesigned this model as I needed special smiles to match teacher‘s request.
Multi color: They are versions you can print using MMU. You can combine single color and multi-color STL. Just load a STL in PrusaSlicer and split it to parts, then make sure to assign the right color to the different parts.
Print settings: Nothing special, just use the default settings. Mine have been printed in 0.2mm layer, nozzle 0.4mm, no support needed.
Assembly: Just use M3x20 screws to assemble the peaks to the body. Do not over-tighten.
The Fusion 360 file is included to ease modification and remixes.
The author remixed this model.