@bill345 said in Ender3 v2 Glass Bed Cleaning & Firmware Upgrade ?: ...Just one more question, noticed that the V2 Meanwell psu has a fan outlet but the Enders black outer metal case plate covers over the air inlet slots on the Meanwells box... Well it depends. If the power supply is over-rated for this application, and the design team have done proper environmental testing with this arrangement (e.g. run the equipment in a chamber for a period of time with the ambient/chamber temperature set to, say, +40'C) then this may be fine. But I don't know how well this current generation of hardware designers test their designs... ...OK, I admit it, I'm an old retired Engineer.