Small clip that snap on to spools and holds the end of the filament to prevent it from unraveling. There are several versions, should work with spools from the following suppliers (at least in 2013):
- Octave*
- Up!*
- Ultimachine
- 3DD
Added a couple more for eSun Filament:
- Inland 1kg* (black spool)
- Intservo 1kg* (transparent spool)
A version of this clip for Atomic Filament spools can be found here. There's also a link to an editable Onshape clip in that post.
Printer:
--Afinia H480*
Filaments:
-- Up! White ABS
-- eSun Red ABS
-- Octave Fluorescent Green ABS
*affiliate link