Mio 4 spot Refrigerator magnet version

I grabbed your Mio 4 spot holder rack and added a simple backing wall to accept 4 to 16 of my 3x10mm (2.7 x 9.9)mm magnets. I use a 0.6mm nozzle so I made the clearances a bit more than I usually would. And I printed 4 little rectangular plugs to add into the top after inserting the magnets.  Using only 4 magnets might not be strong enough so i jammed in 2 magnets into each slot. I'll secure the magnets and plugs with CA glue.  

I will probably reprint it in PLA with a smaller nozzle since this 0.6mm nozzle and PETG is quite stringy.  

EDIT: Added a version with 8 slots total.  I wasn't confident in the holding power so this should allow for up to 16 magnets if needed.  16 may be overkill but it definitely holds them :)