About 2 months after I started using my z5mR2, the power supply died, let out a ton of smoke, then had flames. Highly dangerous. The supply is a JCPOWER JC-240-12, a 12V, 20A supply.
If you have one of these supplies, never leave your printer unattended, but better yet replace that supply.
The failure appears to be a surge supression part that gets so hot it burst into flame burning both the Power terminal connector and a capacitor and transformer near it.