As with most of my designs, its to benefit the students at a school to keep costs low.
We have a project they make and it does require screwing a Philips head machine screw and nut. Now we can't really afford to buy 30x 7mm metal spanners that may go missing within the workshop (or in a cheeky pocket) so I designed minimalist print that would easily be printed quickly, in batches & very little overhangs.
It could easily be scaled UP or DOWN for different sizes.
I've included the STEP for that reason. May upload in future different sizes..
Print:
PLA, PETG, ABS, Granite, Tungsten, Cheese… Anything you want.
Infill 15%
3 walls
No Supports
Brim may be required depending on your adhesion skills.