Rope making can use a simple machine to twist individual yarns into a rope.
Options for making a rugged machine:
CNC aluminum or steel
Complicated assembly to accommodate standard bearings. Have to create separate piece for hook (and bolt/nut) so that bearing can be installed.
Need access to CNC
Single piece of metal, no connectors required.
Install bearings on rods and then bend to shape.
Need tool for bending steel rod
3D printed plastic
Tools available to fabricate
Poor strength, especially when operated by children.
As with the CNC option, one must print in multiple pieces for hook (and bolt/nut) so that bearing can be installed.