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24v Power Tap without buddy board modification!  

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eovnu87435ds
(@eovnu87435ds)
New Member
24v Power Tap without buddy board modification!

I just did a mod to my mini so that I could grab 24v power to regulate for powering a Raspberry Pi and wanted to show off how I did it.

While this method does NOT require modifying the buddy board in any way, I do want to warn that your mileage may vary, and I doubt the Prusa Research team would be pleased if you attempt to do this, blow something up, and try to get a replacement.

In short, I was able to just use an automotive "add-in-circuit" or "fuse tap" for a 24v line, and using one of the unpopulated plugs for Ground.

Before you do this, keep in mind that you are taking some of the power away from your power supply. Calculate your wattage, and be aware of the potential consequences. 

1. Buy an automotive add-in-circuit. Example can be found here: https://www.amazon.com/gp/product/B01DYQM6EO/

2. Get a male dupont wire for your negative side

3. Build your circuit. Place the existing 7.5A for your heater circuits into the bottom of the add-a-circuit, and a 1a fuse in the top for your power tap. For me, I decided to glue a regulator directly to this add-a-circuit to make wiring a little bit cleaner. 

4. Plug in your Add-a-Circuit and Ground wires where I did. If Prusa or the community comes out with an ESP8266 wifi adapter, we'll have to move ground somewhere else. 

 

I was able to do add my regulator in that space while still having the lid close. I just have an extra cable to snake out to power my Pi now. 

Posted : 26/10/2020 4:44 am
Lennart
(@lennart)
New Member
RE: 24v Power Tap without buddy board modification!

Great solution! Never thought about this and was looking for solutions a while. Ordered them right away 🙂 

Posted : 28/10/2020 7:01 am
backslashV
(@backslashv)
New Member
RE: 24v Power Tap without buddy board modification!

Thank you for your post. A couple of questions:

1) in your picture you are using a 3A fuse, but you suggested using a 1A fuse. Just wanna make sure which one to buy.

2) how did you figure that the 7.5A fuse goes at the bottom?

3) does the other fuse spot on the buddy board also do the same thing?

4) with this setup, does powering down the printer via the side button also power down the rPi?

Posted : 11/10/2022 6:24 am
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