Morteza Padarlar Sep 1, 2020 What are bumps? Jack K Sep 1, 2020 Looks like they might be inserts that can be used to quickly change the thread, or replace the high-wear section of mold. I'm not sure why they are proud of the parting line? Jack K Sep 1, 2020 at 8:05 in the video, they show the inserts being pulled out probably just for visual effect to show all the parts of the mold.(the video is a cool shootout to compare several CAD systems) Log in or sign up to post a reply