After years of struggling to find the spice jar that I needed in the cupboard despite endless effort to keep them organized, I finally came up with a solution that works.
Start with the front right unit and store up to 9 spices. Add two more rows to the back and/or more columns to the left as needed. The pieces link together so they won't move apart accidentally.
I used the jars from www.hauslogic.com for mine, but most similarly-sized jars should work. For example, the Morton & Bassett brand jars, available at grocery stores, fit well. You can scale the prints of your rack pieces as needed to fit whatever jars you go with. The files as posted have 50 mm diameter bays.
I recommend using a 0.2mm nozzle to get good letters on the labels. Be aware that, if your jars have lids made of polypropylene, as mine do, you will need to use special purpose glue to attach the labels. I included 48 labels of common herbs and spices and a few uncommon ones that I happened to have made for myself. Grab them one at a time or download the zip file that has all of them. I also included a Fusion 360 project file that you should be able to use to make new labels. If there's a label you need that isn't here, let me know and I'll slowly (eventually) add it to the list.
The author marked this model as their own original creation.