A bespoke tool caddy is just the thing I needed, and Marius_Hugo's was the sleekest design and looked the least fussy to print. I needed to make a few adjustments--some just for personal preference, some to better suit my needs. The full list of changes:

• Removed the Wanhao logo (personal preference)
• Slightly larger hole for the 1.5 mm hex key
• Wider tray to comfortably hold a jumbo glue stick
• Filled in the slot on the left side (I had no use for it and it was a pain to clean out the supports)

Many thanks to Marius_Hugo for the original design!

Also pictured: My remix of RighteousWaffles' MonoPrice i3 Mini Top Cover; I added a notch to the original so it still fits flush with the tower when you have the tool caddy in place.