TUSH2 - The Ultimate Spool Holder Low Gravity

this one has much lower gravity, wider footprint, improved holes for screws, and ball bearings fit easier, M4 x 16 are a bit short, but works if you use them special flat nuts, else see if you can get M4 x 18 and normal nuts.

OPGRADE :
added seperator part for a fixed 1kg spool solution
added anti tilt flips for the loose holders
added 4 x 13 mm sticks, so you can glue them in, and no more need to use screws.