For the longest time I had a wooden toolbox beside my desk that I used to hold miscellaneous items. It was in need of replacing so I thought it would be an easy first project. I made it in TinkerCad in like an hour at most. 

It does need 14 3mx16mm (I could have gotten away with 12mm and probably even 9mm but I have a surplus of 16mm) screws to affix all the sides together. You could probably glue it but I haven't tested it. 

I was trying to match the dimensions of my wooden tool box so it unfortunately requires a minimum 256x256mm bed size. You could absolutely size it down but then the screw holes would be wrong.

It's far from perfect, I probably should have used knurled nuts to make sure the screws stayed and some of the sizing of the pieces is off but it works for what I made it for so I'm satisfied.