These simple external filament rollers can be used to put filament rolls of any size outside your printer & feed into the 3d printer.
Great to load 3kg spools of filament into smaller printers.

This works easily with rolls of any size including 1kg, 3kg, 5kg etc.

The bearings allow rolls to turn freely, regardless of weight. The 2 pieces can be placed as far or as near as possible, based on the width of the rolls.

Particularly useful for small light weight 3d printers which would otherwise topple when a heavy roll was mounted on them.