Our entire spice collection was single layer of jars. Looking around I could not find a solution STL so I went back to the drawing CAD. This spice rack allows you to change the shelf depth, shelf height, lip height and model thickness. Open the model in FreeCAD, call up the spread sheet and modify shelfHeight shelfDepth lipHeight  and rackThickness. The cell rackWidth allows you widen the model, but be careful you are limited by your printer's Z axis for the model is printed on its right side. The side with the stabilizer, see the 3mf file.

The shelf height allows you to adjust the rack's overall height so the rack's top shelf will fit the spice jars. 

No need for supports. I set the Repetier speed to 109% and got the print done in 8 hours. I had no problem with the back panel bridging on my MK3S, it came out perfect to my surprise. I used SUNLU PLA+.

After a few months in service the rack started sagging on the unsupported side. I have revised all the files to add a glue on support, Enjoy!

As new versions of FreeCAD were released some of my sloppiness in the CAD file caused problems.  I uploaded a SpiceRack Clean up.FCStd file to fix scaling issues.