this post was submitted on 10 Nov 2023
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The pi will pull the current it needs, the power supply doesnt push current into the pi. So no need for a resistor.
You can definitely do this, i did it for a pi connected to my 3d printer. You are wasting the 12V rails though, and some PSUs may not like it if the 12V is unused (YMMV).
When i did this, i got a lot of undervoltage warnings on the pi, but it otherwise worked fine.