Marblevator, Grippers.
The final version, with a beefier and quieter motor.
Files and instructions are here:
https://www.instructables.com/Marblev...
https://www.youmagine.com/designs/mar...
https://cults3d.com/en/3d-model/gadge...
https://www.myminifactory.com/object/...
Designed using Autodesk Fusion 360, sliced using Ultimaker Cura 4.12.1, and 3D printed in PLA and TPU on Ultimaker S5s and an Ultimaker 3e.