Anchor Chain Mark

This is a remix with some changes:
- removal of sharp edges
- rework of female tip for an easier assembly
- refining the geometry to fit to the curves of the chain
- adding step files as well

The original assembly is already a great work, thanks for the original owner. It eliminates the need for screws and nuts which commercially available products use and the systems works fine at least for me given I have printed them with petg on a BambuLab machine.

It is possible to print flat (Advantage -> no supports, Disadvantage: a bit harder assembly due to layer lines) or on its side (Advantage and Disadvantage vice versa).