Let me show you my little desktop organizer system "orgaNICE" which contains containers and boards in various sizes. It can be printed in all colors you want and assembled in any configuration you like. For haptical feeling there are TPU footer, but if you fear printing TPU then you can skip this. 

Look at the instruction file I added. There you can find an example of a double 70 mm orgaNICE board which contains a 70x75 mm and a 70x100 mm container and also all TPU footers. For my bathroom I printed the container bodies in PLA marble and board/inserts in black. All these parts can be printed with default settings and without brim/support (also the footer cutouts can be printed without support).

If you like to have different sizes, you can put it as a comment and I will try to realize your wishes if possible :-)

Happy printing ...

P.S. For the magnet boards I bought Danjoy 30x3 mm magnet tape from Amazon.de. If you use this, please do not rely on the adhesive strip, but always use superglue or industrial glue, otherwise the weight will tear it off.