The original of this design was my favorite out of probably 10+ other similar designs I tried. Works on almost every brand filament spool, but there were always a few things bothering me with it.
- Much smaller 'head' so it fits onto brand new spools much easier. Original always would tilt sideways awkwardly.
- Slightly more compression force, so it is much less likely to fall off a thin-walled spool and unravel everywhere as you put it into a box.
- Medium thickness, between the thin and thick models. Works for everything I have, including the hex Prusament spools.
- Only has one slot for 1.75mm filament, I never need the 2.85 hole and am less likely to mistakenly put the filament in the wrong one.
Update 2020/09/26: Added spiky version
