All About HC-05 For CNC Shield and MKS DLC 

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Hi If you mean how I power the CNC shield through Arduino , I just solder VIN pin of CNC shield to positive terminal of Shield and now I can power both from power of Arduino.

@@manifa59 just positive pin or negative as well? I want do this because HC05 only works by powering the Arduino, both with 12V in this case. Thanks for answering me.

Yes just positive pin. negative comes from pin headers and no need for wiring.

@@manifa59 In my case I already have a P4 on the CNC Shield V3, if I solder it this way it will power the Arduino in the same way, right? I'm powering a 12V fan and the Shield V3, in which case will I power the Arduino too?

Plug P4 is soldered with a wire and is on back case, then I feed it through the Shield V3, I will solder a wire to Arduino and test it.

to buy: 1k resistor: www.amazon.com/Projects-100EP5141K00-Ohm-Resistors-Pack/dp/B0185FGTSS/ref=mp_s_a_1_1?keywords=1k+ohm&qid=1671400091&sr=8-1 2k resistor: www.amazon.com/Projects-25EP5142K00-Ohm-Resistors-Pack/dp/B01F06T4PU/ref=mp_s_a_1_5?crid=1JLGFMMEBMDA0&keywords=2k+ohm&qid=1671400140&sprefix=ohm%2Caps%2C616&sr=8-5