OctoPrint Print Server with UPS HAT

thingiverse

Objectives: The primary goal of this project is to establish a self-sustaining Prusa i3 Printer with MMU2 functionality, incorporating an OctoPrint wireless print server. The printer and print server must respond to power switch inputs; the print server should not require its own dedicated power switch. This project involves several related components: - 12/24Vdc to 5Vdc USB A buck converter: https://www.thingiverse.com/thing:4167242 - PSU Cover with Access Door: https://www.thingiverse.com/thing:4153686 - Bear Printer Structure upgrade: https://www.thingiverse.com/thing:2808408 Overview: The OctoPrint Print Server with UPS HAT is a combination of either a Raspberry Pi 3A+ or 3B+ computer paired with a Pi Shop UPS HAT mounted on a V-Slot channel commonly used in Prusa I3 MK2 or Mk3 series printers equipped with the Bear Upgrade. The RPi 3A+ offers a compact design but lacks USB and Ethernet ports. It's ideal for applications where space is limited, primarily focusing on OctoPrint usage. In contrast, the RPi 3B+ has a larger form factor, including four USB and one Ethernet ports. Power supply for the Print Server comes from the Printer PSU via a 12/24Vdc converter (see above). The Pi Shop UPS powers the RPi for short intervals following printer power off or utility power loss. By default, this period is set to 60 seconds but can be adjusted for longer durations. Upon expiration of the power loss interval, the RPi is commanded to shut down gracefully, preventing software corruption due to abrupt power failure. Upon power restoration, the UPS initiates a reboot of the RPi without user intervention. The UPS connects directly to the RPi via GPIO pins; no external connections are required. Print server power is supplied through the RPi's micro USB Power Port. The RPi's power supply must be capable of 5.1Vdc at 2A, although current draw typically remains below 1A in normal operation. Assembly: 1. Place the UPS battery side down on the Upper case. 2. Install four standoffs into the Upper case through holes in the UPS HAT. 3. Insert RPi GPIO pins into the UPS GPIO sockets. 4. Place the Bottom case over the RPI and secure it using 4 flat head counter-sunk M3 machine screws. 5. Install Octoprint Software per https://octoprint.org. 6. Install and configure Pi Shop UPS HAT software per the included Word Document.