Micro-injection molding means working with part ... multi-cavity valve gated cold runner system. All gates must open simultaneously in this type of system to maintain balance.

Recently [Stefan] of CNC Kitchen took a gander at using his gaggle of 3D printers to try injection molding (IM ... such as opening up the injection gate (to decrease pressure inside the mold ...

If you want real strenght in plastics, though, or to produce a LOT of parts, you probably want to step up to injection molding. As it turns out, 3D printing can help in that regard, with injection ...