This is one of my side projects to develop a carrier case for the Raspberry Pi Model A that runs the ArOZ Online System (Web Desktop for File Storage). Visit the following link to see my Web Desktop Platform designed for slower Pis over here: https://github.com/tobychui/ArOZ-Online-System

Hardware Requirement
Raspberry Pi Model A (Pi 1 Model A or Pi 3 Model A)
USB2.0 to Ethernet Adapter
SD card (For installing Raspbian / Raspberry Pi OS + Storage)

You can purchase a USB to 2.1mm DC power cable for the 2.1mm DC jack or you can make good use of the remaining space behind the DC jack to put a build in voltage regulator that convert 12v power input to 5V and connects to the GPIO of the pi for powering. It is up to you :))

Generic FDM Printer

No

No

0.15mm

20%

You do not need a heat sink if you are using Pi 1 Model A as Pi A don't produce much heat. However, you might consider adding one if you are using Pi 3 Model A or otherwise the PLA case might get soften after some period of use.