by Chris Tyler:
Adding ridges to a pill bottle cap, Part 1
This beginner modeling tutorial for people new to Design 3D shows how to add little grip ridges to a pill bottle cap. NOTE: The start file is in 8.2.1 format and this isn’t backward compatible to prior versions. However, the start file also includes an OBJ version of the cap mesh which can be opened and used in versions prior to the 8.2.1 update. A second method for producing ridges that are integrated into the cap mesh is here.