Gridfinity bin for a simple ruler that saves space and filament with a stackable bin.

• (1x1 grid x 1U height) * 2
• No magnets
• 4 mm nozzle
• 0.2 mm layer height
• 10% gyroid infill

Print profile has two two one-one units for both ends. 

Also uploaded the autodesk fusion file if you want to make changes. The idea can be used for any long items that do not require supports in the middle.