I made this case to hold my imperial and metric sets of tips for installing heat set threaded inserts. The tips I have are Virtjoule brand, but this case should work for most tips compatible with Hakko FX-888D and Weller SP40NKUS type soldering irons. Also, they should work for any tips up to .250" (6.35mm) in diameter with a max length of 1.650" (41.91mm).

I've made two different designs of the case. One with just a sliding lid and the other with embedded magnets to help hold the lid closed. There's also files for each design with no text if that works better for you. I plan to make another design where the magnets can be glued into the lid and case to make it easier to print.

The size of the magnets that I used is 3/16" diameter x 1/16" high (4.762mm dia x 1.587mm high). They are N52 type neodymium magnets, so they are strong for their size. If you use magnets that are a lot weaker, the lid might still slide open easily.

Measuring the magnets with dial calipers I get .1895" dia x .0630" high (4.813mm dia x 1.600mm high). Keep these measurements in mind because the pockets in lid and case are sized so the magnets have a slightly tight fit. That way they stay in place while the print finishes. When I printed them, I just inserted a color change in Prusaslicer at the layer above the magnet pockets so I could insert them.

When slicing these files to print, I found that if I let Prusaslicer fix the errors in the models it eliminated the pockets for the magnets. Keep that in mind when you slice them. 

I recommend supports for the upper surface of the lid slide channels in the case. I used snug type and they were very easy to remove. Just remember to block supports on the inside of the magnet pockets. I'll include some screenshots of how the supports looked after I sliced the case.

Print settings that I used:

• .4mm nozzle
• .2mm layer height (quality preset in PS)
• 3 perimeters
• 15% infill using support cubic
• "Snug" type supports for the case (.2mm top contact Z distance)

This is my first try at learning Freecad and parametric modeling, so hopefully the models are easy to print and work well for all types and brands of slicers and printers. I'd appreciate some feedback if you find issues or have ways to improve the models. I'm always wanting to learn. :-)

Both of my test cases were printed in PLA. The silver one is the free Prusa PLA I got with my MK3S+ and the other one is printed in Atomic Mysterious Abyss v2 Pearl PLA.