This little Duplo compatible brick features 2 rollers so you can build a cable car or other things that involve a rope.

All you need in addition is
2x Lego Technic axles (length 6 or longer)
4x Lego Technic stoppers
(If you don't have any Lego axles just use a M4 screw with nuts)

The bed adhesion of the lego compatible brick version can be critical. If you have issues with adhesion, try the other version or a raft.

Fusion360 files are included if you want to modify it. Happy printing!