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Yes, I know that Raspberry pi Foundation recommends 5V with 3 Amps, but every raspberry pi 4B I have purchased (about 5 now), I have always purchased a CanaKit power supply with it and it is rated at 5.1V for 3.5 Amps.
The converters you have (Jsdoin 6 Pack LM2596) will only output a Maximum of 3 Amps and in the NOTES section of the “Jsdoin 6 Pack LM2596” states, and I quote “Keep it under 2.5 A and use the heat sink when working for long hours.” Well, I plan on using my raspberry pi 4B for LONG hours; I want to leave it running continuously so I can have Octoprint running. So since the minimum for the raspberry pi 4B is 3 Amps and the the “Jsdoin 6 Pack LM2596” will only output 2.5 Amps continuously, I thought that giving the raspberry pi a little bit more Amps might be a good idea.
No worries thou, I can just but the NOYITO DC-DC converter in an external box to feed the power to the raspberry pi 4B.
I thought the only difference between the 3B+ and the 4B (besides the power connection and hdmi connections) was that the Ethernet connection has been swapped with the USB 2.0 tower. The USB2.0 tower and the Ethernet connection can be the same height if you chose to make the Ethernet space that size.
So I think what I am asking is can you make the three spots for the Ethernet connection and the USB2.0 Tower and the USB 3.0 Tower to all be the same dimensions? That way I think the box could accommodate both a 3B+ and 4B.
Since the micro-HDMI connection and USC-C power connection will not be available to the outside of the box, no need to worry about those connections. Anyways if you are using the raspberry pi to have Octoprint connected to your 3D printer, than you will not care to have access to to micro-HDMI connections.
Since your box design accommodates the ability to power the raspberry pi, not having access to the USB-C power connection is not a problem either.
For me I will just add a hole to the plate with my dremel tool to get cables into the box to power the raspberry pi 4B and use a “2pcs Parallel XT60 Connector Plug for RC Lipo Battery (1 Female XT60 Connector Plug to 2 Male XT60 Connector Plug)” to feed into my “NOYITO DC-DC converter” then take the cables from output to inside your box to power the 4B.
I will look at the cable routing once I print out the box and place all the items I have in the box. Right now, I am still printing parts for a Dry Box for all my filaments.
So, Can you make the three spots for the Ethernet connection and the USB2.0 Tower and the USB 3.0 Tower to all be the same dimensions??? Do you think doing that will allow the raspberry pi 4B to be used with your box design??