This is a spare bobbin for the  EEW 6.0 by Maurice Ribble of Dreaming Robots (https://www.dreamingrobots.com/product/eew6/)

The bobbin comes in three parts - two ends and a centre tube, that push together.

We can provide two R6-2RSV bearings (one for each end of the bearing) if required.

Bobbins are 150mm tall and 75mm in diameter with a 10mm hole through the centre.

We have other items available for EEW as well

This design is from "EEW 6.0 Bobbin" (https://www.thingiverse.com/thing:4840573) by mribble, where it is downloadable, and is licensed under the "Creative Commons - Attribution - Share Alike" license (https://creativecommons.org/licenses/by-sa/3.0/).