Original Prusa i3 MK3 Einsy + Raspberry Pi A+ mod
Description
**Update 18.09.19. I no longer own the Prusa printer so my ability to support this mod is limited.** **Update 15.05.19. You may need to raise the soft throttling limit to 70º on A+ if you observe throttling events. Other than that there have been no issues with the mod since December last year.** **N.B! Before you attempt this mod please be advised that you'll have to unsolder the 40-pin header from RPi A+ which has proven to be extremely difficult.** **At the moment of writing this mod has been tested on Bear only, minor modifications to the lower bracket and assembly instructions are needed to use in stock configuration.** # BOM ## Purchase - 1x Raspberry Pi A+ - 5x 18mm header pins - 4x M2.5x6mm screws ## Print - 1x Einsy enclosure - 1x Lower bracket - 1x RPi cover - 4x 1.2mm spacers # Preparing the RPi - Unsolder the 40-pin header. - Solder in 5 18mm pins, as shown on the photo (more information [here](https://manual.prusa3d.com/Guide/0.+Preparing+necessary+components/585?lang=en)). Note that I chose not to solder the 6th pin in the corner, which connects the Einsy GND to a GPIO pin on Raspberry (for reasons unknown). - Disable Bluetooth and restore UART1 (more information [here](https://help.prusa3d.com/article/Loz15FAgEk-octo-print-raspberry-pi-zero-w)). # Preparing the Einsy If using Klipper: - Rebuild the MCU code to use UART1 and flash the Einsy. If using the stock FW: - No configuration changes are needed, when everything is assembled you'll need to enable "RPi port" in the menu. # Assembly - Mount the Einsy in the enclosure using M3x10 screws. Note that you don't need nuts for lower mounting points, use the printed bracket instead. - Plug in the Raspberry into the Einsy. - Insert a 1.2mm spacer under each of 4 Raspberry mounting points and affix to the Einsy enclosure using a M2.5x6 screw. # Power and other considerations There were concerns that the 5V 2A regulator on the Einsy board may not be capable of powering the Einsy, fans, RPi and the USB webcam. In my testing this was not confirmed. I was able to complete a 12 hour print, with Logitech C270 connected via USB, while monitoring the RPi throttling flag, which never triggered. So the regulator was never overdrawn. Some clearances are tighter than I'd like. In particular not every USB plug will fit, due to clearance to the power input terminal pins on the back of the Einsy, see photo. Make sure that the plastic case on the USB plug is not thicker than 1.5mm measured from the metal connector. C270 plug was thicker but I had no problems filing it down. Also unplugging the USB when the printer is on **is guaranteed to short the 24V rail** due to how things are located, see photo. I advise to use a short USB extender.
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