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100g should rewind a completely full 1kg spool with no problems.

One sanity check.....completely assemble the rewinder, but do not mount a filament spool and do not put any weight (or elastic) on the track. Lift the track to the top (last tooth on the bottom of the track is only one in contact with the small gear) and let go.

for me, the track will slowly start to fall and then accelerate until it bottoms out in the channel. The resistance is low enough that the weight of the printed track alone is enough to rewind the cap/shaft/nut assembly.

Does yours do the same?

yes, please print a v1.1 unit. There many improvements for both function and handling/use.