Soldering tips + flux + tinner + brush holder

thingiverse

The holes for the tips are designed to be 7mm in diameter specifically for the older style 900M-series Hakko tips, including various adopters, clones, and knockoffs of that form such as Aoyue. The tiny hole securely holds a Dremel-style tool like the brass bristle brush that I use frequently to clean the printer nozzle, but it's also occasionally useful when soldering. The large hole is for a flux pen, and the wider slot is designed specifically for a small can of tip tinner. Hopefully, the paste in the can will remain solid enough not to be affected by being tilted - time will tell! If you want to adjust the hole sizes, the FreeCAD file is set up very well for making tweaks.