It's a storage box (container) for apex-like sharpening stones (or any other rectangular stuff).
Newly created from scratch, features lightweight see-through design, nice fit, snap-on cover and additional numbers to store each stone on it's own place. Also there are utility windows on the bottom to push those out, if fit too tight =)
1.4mm thick walls with 2mm bottoms for sturdy construction.
Reworked version of my sharpening stones container
Two versions of STL (different stones sizes):
Diamond version: 10x23x160.5 (HxWxL) x5 blanks
Water version: 9.5x21.5x157.5 (HxWxL) x5 blanks
I measured my aliexpress stones, so be sure to check yours, before printing anything.
Both have additional 0.25mm backlash for each dimension to compensate printer lack of accuracy and measurements errors.
Also, if anyone interested, for a small $3 tip I can make a personal stl, customized for your needs (amount of places, each place size/label, wall thickness, reinforcement diaphragms count and etc), like those on the photos. paypal.me/PsychodelEKS
May need supports under longer horizontal bridges, but depends on your printer/filament abilities.
For PETG stringing, I use soldering heat gun to remove all the "hair".