>> you wanna design your mold to "cleanly lift" off a piece without anything getting stuck. THIS!! Make sure you have a good draft angle and reliable release

>> you wanna design your mold to "cleanly lift" off a piece without anything getting stuck. THIS!! Make sure you have a good draft angle and reliable release agent coating, or a multi-part mold that can come apart at the seams (which does 99.9% mean a flash cleanup step in your mfg process) With those, it will work great. Overlook it, and you'll have a very tedius cleanup job before your next part, or worst case, an expensive doorstop or coffee table piece.