OctoPrint Print Server with UPS HAT
Description
Objectives: ========= The goal of this project and the other projects listed below was to create a self contained Prusa i3 Printer with _MMU2_ including an _OctoPrint_ wireless print server. The printer and print server must power up and down in response to the printer's power switch; that is the **print server must not require a separate power switch**. The other parts of this project are documented here: - 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** consists of either a _Raspberry Pi 3A+_ or _3B+_ computer along with a _Pi Shop UPS HAT_ mounted on a V-Slot channel most commonly found on the _Prusa I3 MK2_ or _Mk3_ series printers with _Bear Upgrade_ installed. The RPi 3A+ is a smaller package but includes only one USB and no Ethernet port. It is most suited where space is an issue and the device is used primarily for _OctoPrint_. The RPi 3B+ is larger and includes 4 USB and one Ethernet ports. The Print Server is intended to be powered by the Printer PSU via a 12/24Vdc converter. See above. The _Pi Shop_ UPS powers the RPi for short periods of time following printer power off or loss of utility power. By default the period is set to 60 seconds but can be adjusted for longer intervals. At the end of the power loss interval, the RPi is commanded to power down gracefully thus preventing software corruption due to abrupt power failure. The UPS will command a reboot of the RPi upon power restoration without any user intervention. The UPS connects to the RPi via the GPIO only. No external connections are required. Print server power is via the RPi micro USB Power Port. The RPi power supply must be capable of 5.1Vdc at 2A although in normal operation current draw is rarely above 1A. Assembly ======== 1. Place the UPS Battery side down on the Upper case, 2. Screw 4 standoffs into the Upper case through the holes in the UPS HAT, 3. Insert the RPi GPIO pins into the UPS GPIO sockets, 4. Place the Bottom case over the RPI and fasten the two halves of the case 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.
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