Magnetic Koozie Holder

My wife has an obsession with koozies, we get one on every trip, so I needed a better place to store them.  Looking at the others available, nothing was more than just a box and they all used more filament than I thought they should.  I created this one to hold as many as possible, it's 230mm tall, while still reducing filament usage.  I use four 3x20mm round magnets on the back to hold it to the fridge.  You could easily add a whole if you wanted to mount to a wall instead.  

I did add supports that reach to near the top to keep the sides from wobbling during the final layers.  My first attempt failed in the last 15mm.

Many have asked for a slim koozie version, so here it is

https://makerworld.com/en/models/1308460-slim-koozie-holder-magnetic#profileId-1342262