If you have an OpenGrid snap that's too stuck, try pulling it with this tool. Either use it by itself or, for more leverage, insert a screwdriver or other rod into the hole.

This works on the normal multiconnect snaps, the directional ones, and the anti-rotation snaps.

If your bridging isn't great, you may want to add some support.

.STEP included.

Remix info:
Used openGrid's multiconnect template, and modified it to also fit over the anti-rotation snaps. Added some features to allow pulling the snap out easily.