This 3x1 Gridfinity storage case allows to store the plastic box containing extra accessories associated with the ROXON FLEX multitool. May be useful if you have (just like me) also ordered several extra parts alongside the FLEX itself.

Links : 

• ROXON FLEX : https://roxontool.com/collections/all-products/products/roxon-s804-flex-multi-tool-open-source-modular-design-and-customizable-multitool-for-everyday-carry-edc-hobbies-outdoors
• ROXON FLEX accessories : https://roxontool.com/collections/blades-for-flex

Example of boxes : 

(here from sets available in EUROPE : RXFT01, RXFT02, RXFT03 and RXFT04 + 2xspacers)

Can easily hold ~20 boxes - note : not all boxes have the same exact thickness.

• Small ones are : 98.40 mm x 11.20 mm x 7.80 mm
• Thicker ones are : 98.40 mm x 11.20 mm x 11.20 mm

Nothing special about the printing / no supports needed. On my side, printed in PETG on a Bambu X1C.