Collapsible basket

This is a collapsible basket that can be tweaked with the customiser. The bottom has a grid, so the basket can be used to store wet items or items that should stay dry. Can also be used as a colander.

Tune with the following variables:
innerLip=1; //The inner lip is the lip at the top that prevents the collection from disassembling. Set to 0 if you don't want an inner lip.
height=20; //Height of the first ring. With inner lip set to 0, this is for all the rings.
wallWidth=2; //Thickness of a ring.
catch=4; //Distance the catches are outside the rings. This is at both the top and the bottom.
start=70; //radius of the inner ring.
layers=7; //Number of rings.