In building the Rat Rig Vcore 3, I wanted to find some cheap and easy solutions for adding a graphical user interface to the machine, as well as powered this and the Raspberry Pi used by Klipper. This video is a guide to using these cheap and easy solutions on your own 3D printer.

If anything changes in future, for instance a component failure, I will update here and/or in a pinned post. Do you think these solutions are a good idea?

0:00 Introduction
Previous guide on Octoprint:    • Octoprint Raspberry 4B + 4K webcam gu...  
My Rat Rig vcore 3 playlist:    • Rat Rig Vcore 3 build  

1:09 Common Octoprint display solutions
My Creality CR30 test:    • Creality CR30 3DPrintMill belt 3D pr...  
Testing Octodash on the BIQU BX:    • BIQU BX  Octoprint compatible 3D pri...  

2:31 Using a recycled phone or tablet as a display/interface
Printable tablet holder parts: https://www.thingiverse.com/thing:487...
My Snapmaker 2.0 review:    • Snapmaker 2 0 review  A 3D printer, ...  

4:42 Common ways to power a Raspberry Pi
Official raspberry pi power supply: https://www.raspberrypi.org/products/...
Kamera 10 port 120W 5V power supply on Amazon: https://amzn.to/2SiLjx5
Comsol 10 port 120W 5V power supply in Aus: https://www.officeworks.com.au/shop/o...
Previous video on buck converters:    • Buck converters: Quieten your 3D prin...  

5:55 Powering a pi from a vehicle USB adaptor
The first option I tested (worked fine but bulky):
Vehicle socket: https://amzn.to/3z8wUUU
24V compatible twin 5V adaptor: https://amzn.to/2SkZAcF

The second option I tested (worked fine, cheaper and more compact) :
24V compatible allinone twin 5V adaptor: https://amzn.to/3g0CUrt

7:45 Wiring and mounting the USB adaptor
My video on crimp connectors for 3D printing:    • Guide to crimp connectors on 3D print...  
Irwin visegrip 8” wire stripping tool: https://amzn.to/3wuSosS
Assorted terminal set: https://amzn.to/2TgVwuj
Terminal crimping tool: https://amzn.to/2TcyJQi
You can also use the crimping section of the wire strippers for these connectors.
Printable USB adaptor/mains plug files: https://www.thingiverse.com/thing:487...

10:34 Conclusion: Does this really work?
Based on my research, a Pi 4B by itself consumes up to 1.3amps. Any additional current draw comes from plugged in peripherals. Therefore in our case we only need to worry about a webcam and maybe a filament runout sensor drawing less than 0.8 amps combined.

Raspberry Pi power consumption tests: https://raspi.tv/2019/howmuchpower...

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