ea69 did a fantastic job with its spool-rewinder (https://www.thingiverse.com/thing:3691892).
For me, the provided spool-holder was a little-bit to low, so some of spools had a to large diameter finally to turn freely.
I created a "tunable" version of both the 65mm and 90mm stand with some modification - please use the openscad-file to tune yourself.
tunable is the overall height of the stand. I added 30mm in height, but you can use the attached openscad-file to tune to any value you need.
Furthermore I added screw-driver holes to allow turning the screws which fix the filament-arm.
added some support-structure under the track
- Finally I added the option to fix the stand via screws on the bottom.
Feedback welcome. I have it in use and works like a charm.