What weapon do I need to break into a Manufacturing Facility?

To open these kind of reinforced doors you must either install a boltcaster on your Multitool or Plasma Grenades. This will attract the sentinel droids though when destroying the door. Personally I recommend the Grenades, because they can destroy the doors much faster than the Boltcaster. :-)

With a lower powered multi-tool you will need to use a bolt caster or preferably grenades to open these doors.

A mining laser with few or no mods can't get in but I find that my fully upgraded mining laser has no problems.