Explain the principle of zippering. Put down few seperate meshes of one object obtained from different views, and the final object mesh after merging.

The meshes to merge:

Mesh 1:
Mesh 2:
Mesh 3:

Different views of the final merged object surface:

View 1:
View 2:
View 3:

Comment on possible errors in alignement, imperfection of the final surface... Comment also on the program zipper. How easy is it to use it? What would you change? or what have you tried?