I needed something to organize my cartridges, so I whipped this up in Fusion 360. I've included the Fusion 360 design files. There are two copies of the model in the file that I used to test the fit, and there's some slight interference there to ensure a good fit for the connectors. I printed these without a raft or support, just a skirt, and they came out just how I'd hoped!
The author marked this model as their own original creation.