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Dear ea69,

really nice work. Thanks.

I have remixed it and added a small box on to be attached to your track. The box can be filled with "mass" - so the bolts you mention are not any longer required.
In addition my spool had a very (48mm) inner diameter. This was to small for your caps to center it properly. Have added some adapters as well in mine remix.
https://www.thingiverse.com/thing:3714696

Feedback welcome. Thanks for your excellent work.

mass-cube and adapter for spools with smaller diameter
by behn66