Needed something to de-clutter my wife's box of bobbins. Printed this.
Janome bobbins will snap nicely into place, but still not be under pressure, so the print works nicely with PLA, ABS and PETG.

Print instructions

Category: Organization Print Settings

Printer Brand: Prusa

Printer: I3 MK3S

Rafts: No

Supports: No

Resolution: 0.15mm

Infill: 100%

Filament: Add:North PETG
Notes:

Print only walls, as infill will not be pretty with this design. I printed with 4 perimeters.