Stackable containers parts for ROSA3D refill core

I love making small boxes and containers.

This one offers a way to reuse the cardboard core of Rosa3D refills, and turn them into stackable, modular containers.

For one core you will need 2x lid and 2x threaded insert.
Add 2 more threaded inserts and 1 ring to attach two containers together.

Also works with Fiberlogy refills.