3.5" Touch Screen Mod for Prusa Mk2/2s/3/3s

thingiverse

Here are some of the improvements and additions I've made: - New supports allow centered installation on the original frame. They also raise the panel enough to connect a USB to power the Raspberry Pi. - Redesigned touch screen mount accommodates most 3.5” screens without modification. - Backplate for the Raspberry Pi has a case for standard size buck converter, allowing powering the Raspberry Pi using the printer PSU. - Cable clips can be easily mounted on the frame for cable management. If you're interested, I'll upload it. Required components: - Raspberry Pi 3b/3b+ - 3.5” TFT screen connected to the Raspberry via GPIO. This is the one I used: https://www.sainsmart.com/collections/raspberry-pi/products/3-5-tft-320-240-touch-screen-display-for-raspberry-pi. Follow the instructions here to set it up on Raspbian: https://www.elecrow.com/wiki/index.php?title=3.5_Inch_480x320_TFT_Display_with_Touch_Screen_for_Raspberry_Pi - 6 x M3x10 screws - (Optional) Buck converter to power the Raspberry Pi using the printer PSU. I use this one: https://www.ebay.com/itm/LM2596S-Step-Down-Module-DC-3V-40V-to1-5v-35V-3-3V-5V-12V-3A-Voltage-Regulator/173427982213?hash=item28611cff85:g:PooAAOSwjZ5bR4f3 - (Optional) For easy setup, L-shaped micro USB connector and cable. You'll need a clearance of 25mm between ground and printer frame. In my case, I've made some custom mounts for Zaribo rubber feet: https://zaribo.com/other/42-original-prusa-zaribo-edition-rubber-feet.html Instructions: 1. If you plan to use a buck converter: a. Solder 2 wires to the input of the converter, long enough to reach the printer PSU or the Rambo board. b. Connect the input to the PSU or Rambo board. c. Mount the right panel support on the exterior of the back panel, by sliding it about 30mm from the side where the triangular ventilation holes are. 2. Cut 4 pieces of cotton swap (the plastic tube part) to be the same size as the spacers. 3. Insert the 4 tubes into the back panel cylinders. It should take a bit of force for them to go all the way in holes. 4. Mount the Raspberry Pi board on the back panel. The tubes should slide through the board holes. The board should slide all the way to the 3mm back panel spacers. 5. Mount the printed spacers on the Raspberry board, by sliding them around the tubes. 6. Mount the 3.5” TFT screen on the Raspberry Pi board using the GPIO connector. 7. Mount the whole assembly on the right side of the main panel using four M3x10 screws. 8. Mount the left support on the original LCD screen, by sliding it to the middle of the screen, right in the middle of the 2 ribbon connectors (there is enough room to re-insert the ribbon cables). 9. Install the Prusa LCD screen on the left side of the front panel, using the original screws. 10. Connect the 2 ribbon cables to the LCD screen. 11. Using the original screws and square nuts, mount the whole panel to the printer. 12. Install the cable clips to the left/front horizontal aluminium profile of the printer. This is done by holding the clip in horizontal position and sliding the conical part of the clip into the profile. Finally, twist the clip 90 degrees to lock it in place. 13. Using the cable clips, pass the power and USB cables (I also use the same clips for the camera USB cable). 14. Connect the power cables to the PSU or Rambo board. EDIT: For GUI, I'm using Octoprint-TFT: https://github.com/darksid3r/OctoPrint-TFT