Just wanted to share some of the great inkscape plugins I’ve found.
Lets you build boxes with interlocking tabs:
For making gears:
Making flexible (elliptical boxes):
(Note you really need air assist to cut the flex joints)
Jigsaw puzzle creator:
Actually I meant to include this boxmaker plugin: think https://github.com/hellerbarde/inkscape-boxmaker
This one is good too. http://boxmaker.connectionlab.org/