Thanks to @WWS3D ‘s comment on the previous video, there is now the fastes and easiest way to make thin parting lines for 3D printed slip cast molds in Blender. Per the comment suggestion, this tutorial shows you how to use the complex mode of the solidify modifier to create perfect parting lines every time. It is important to check for and fix flipped normals and non-flat faces, ensuring your models are ready for boolean operations.

00:00 Introduction
00:20 Using the Complex Solidify Modifier
00:37 Checking Normals
01:05 Checking for Non-Flat Faces