Well the previous molds tended lose their seal cause they were too shallow. If you note the filter that's been moved out of the ER4 housing, this negates the acoustic need for the large barell to be within the mold. It's not an perfect mold in terms of insertion depth, I wanted it longer, but it's about as good as I'll expect from the cheapest audiologist in town, by a contract with a lab abroad.
These are the deepest molds I've seen:
Edited by markanini - 5/28/13 at 6:28pm