Foldable or roller type curtains often use ballchain to roll up and down the curtain, that is lock (or stopper) for these kind of curtains.
This lock this chain with ball diameter 3mm and gap between balls is 1mm.
| curtain_chain_lock_3-pin.stl | 523.7KB | |
| curtain_chain_lock_4-pin.stl | 525.1KB |
