Anet A8/AM8 Power Modifications

Power Supply

While I was out reading about the things people believe caused the fires, it sounded like the power supply was in question.  I read something along the lines of “its the cheapest version of this power supply” more than once. At the link below, is the power supply I ended up going with.  It was recommended by someone else and had decent reviews.  I’ve been running it off/on for a year now and had no issues with it.

Below is the wiring diagram from the Anet A8 assembly instructions.  Its very similar to the power supply I purchased.

 


Mosfets

One of the other major concerns when it came to starting fires, was the wiring between the board and the hotbed and hotend.  I saw pictures of burn marks where the connector plugs into the bed and on the board.  These connectors on the board are not attached very well, and at one point I even ended up gluing and soldering them into place during the AM8 conversion.

I have yet to solider the bed connection directly to the bed.  This connector is one of the possible failure points.  But because of the cable chains I printed, and the way it holds the wires, I’m not very concerned with this wiggling free and allowing a short.

I’m not going to pretend I fully understand how the mosfets work, but I can tell you what I know.  The mosfet allows the higher voltage power, to route around the board, while allowing the board to still control the flow.    The ones I bought were once again, recommended by another post. 

The concern with fires is around the wiring on the bed, most people do not also install a mosfet on their hotend.  However, they were so cheap, and it was easy to do, so I did.

These wiring diagrams are basically the same thing.  When wiring the hotend mosfet, you would put the hotend where the hotbed is.. right?  My hot end has 2 positive and 2 negative wires, just stack them together.
(if this doesn’t make sense to you, go get some adult supervision)

 


Plug / Switch Combo

This plug/switch/fuse combo is just a nice addition to the printer.  Without it your wiring a cut power cable directly to the power supply.  Not super portable, and less safe in my opinion. Plus these are cheep!

I did have to print something to mount this to, but there are several versions on thingiverse.  I printed mine before the VR Incident, so I modified it to work for the AM8 conversion. 

The wiring diagram is pretty simple.

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