Designed these to keep dust and debris out of my engine while I work on it over several weeks. These are vented at a downward angle to prevent anything from falling in, but when rotating the engine, the compression can escape, making it easier to rotate by hand.

One is threaded and should be made with PLA, ABS, PETG, or other rigid filaments. I also made it have an 8mm allen socket on the inside in case it somehow breaks off inside the head One is not threaded and is meant to be pushed in and pulled out; it needs to be printed with TPU
This one comes with a Driver tool, which is meant for an 8mm allen head and will help put these in and out faster, especially if you have the valve covers on.

Category: Automotive