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

prusaprinters

<p>I made a Dual Color Remix of the awesome 3,5" Touch Screen Mod by Darksid3r. I found his remix on Thingiverse and modified it so it can be printed in two colors. I also added some danger stripes, the MMU2S text, and the Raspberry Pi logo.</p> <p>All info is copied from the original project by Darksid3r!</p> <p>This is the original design:<br/> <a href="https://www.thingiverse.com/thing:2918314?fbclid=IwAR1369WlQhx5IY4qgKhnGd_VpHcxdyWn3cV-7UitN58M9w2DlGEJLMm0AuE">https://www.thingiverse.com/thing:2918314?fbclid=IwAR1369WlQhx5IY4qgKhnGd_VpHcxdyWn3cV-7UitN58M9w2DlGEJLMm0AuE</a></p> <p>Here are some of the improvements and additions I've made:</p> <p>new supports, allowing centered installation on the original frame. It also raises the pannel enough to connect a USB to power the Raspberry Pi.<br/> redesigned touch screen mount, which should be able to accommodate most 3.5” screens without any modification<br/> backplate for the Raspberry Pi with a case for standard size buck converter (see picture) allowing powering the Raspberry Pi using the printer PSU<br/> cable clips that can easily be mounted on the frame for cable management.<br/> If you guys are interested, I will upload it.<br/> Required components:</p> <p>Raspberry Pi 3b/3b+<br/> 3.5"TFT screen connected to the Raspberry via GPIO. This is the one I used: <a href="https://www.sainsmart.com/collections/raspberry-pi/products/3-5-tft-320-240-touch-screen-display-for-raspberry-pi">https://www.sainsmart.com/collections/raspberry-pi/products/3-5-tft-320-240-touch-screen-display-for-raspberry-pi</a>. Follow the instructions here to set it up on Raspbian: <a href="https://www.elecrow.com/wiki/index.php?title=3.5_Inch_480x320_TFT_Display_with_Touch_Screen_for_Raspberry_Pi">https://www.elecrow.com/wiki/index.php?title=3.5_Inch_480x320_TFT_Display_with_Touch_Screen_for_Raspberry_Pi</a><br/> 6 x M3x10 screws<br/> (optional) buck converter to power the Raspberry Pi using the printer PSU. I use this one:<br/> <a href="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">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</a><br/> (optional) for easy setup, L-shaped micro USB connector, and cable.<br/> You will need a clearance of 25mm between ground and printer frame. In my case, I've made some custom mounts for Zaribo rubber feet:<br/> <a href="https://zaribo.com/other/42-original-prusa-zaribo-edition-rubber-feet.html">https://zaribo.com/other/42-original-prusa-zaribo-edition-rubber-feet.html</a></p> <p>Instructions:</p> <p>If you plan to use a buck converter:<br/> a. Solder 2 wires to the input of the converter, long enough to reach the printer PSU or the Rambo board. I connected them to the power input of the Rambo board, fixing them together with the PSU power cables, using the Rambo screws.<br/> b. Connect the input to the PSU (or Rambo) power (24V). Watch the polarity!<br/> c. Use the potentiometer on the buck converter to adjust the output voltage to 5V, using a multimeter.<br/> d. Cut a cable with an L-shaped micro USB connector at a length of about 8 cm.<br/> e. Solder the cable to the output of the buck converter. Watch the polarity! Red is positive, black is negative, the other 2 wires are not used.</p> <p>Print front/back panels, left/right supports, and 3-4 cable clips. The front (main) panel has to be printed diagonally in order to fit on the bed!</p> <p>If you plan to use a buck converter:<br/> a. Print the buck converter case, you should check if your particular converter fits in the case<br/> b. Mount the buck converter case on the back panel, using two M3x10 screws. Make sure you mount the case on the exterior side of the back panel. The exterior side is completely flat while the interior side has 4 raised 3mm cylinders.<br/> c. Stick 2 small pieces of electrical tape on the screw heads to avoid any risk of electrical contact with the Raspberry pi board.</p> <p>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.</p> <p>Cut 4 pieces of cotton swap (the plastic tube part) to be the same size as the spacers.</p> <p>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.</p> <p>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. The SD card side of the Raspberry board should be on the same side as the triangular ventilation holes in the back panel.</p> <p>Mount the printed spacers on the Raspberry board, by sliding them around the tubes.</p> <p>Mount the 3.5" TFT screen on the Raspberry Pi board using the GPIO connector.</p> <p>Mount the whole assembly on the right side of the main panel using four M3x10 screws.</p> <p>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 reinsert the ribbon cables).</p> <p>Install the Prusa LCD screen on the left side of the front panel, using the original screws. Make sure that the left support goes into the notch between the 2 "teeth" on the front panel.</p> <p>Connect the 2 ribbon cables to the LCD screen.</p> <p>Using the original screws and square nuts, mount the whole panel to the printer.</p> <p>Install the cable clips to the left/front horizontal aluminum profile of the printer. This is done by holding the clip in a horizontal position and sliding the conical part of the clip into the profile. Finally, Twist the clip 90 degrees to lock it in place.</p> <p>Using the cable clips, pass the power and USB cables ( I also use the same clips for the camera USB cable).</p> <p>Connect the power cables to the PSU or Rambo board.<br/> EDIT: for GUI, I'm using Octoprint-TFT:<br/> <a href="https://github.com/darksid3r/OctoPrint-TFT">https://github.com/darksid3r/OctoPrint-TFT</a></p> <h3>Print instructions</h3><p>Print in 0.2 mm layers and 20% infill. Also, turn on "detect thin walls" in Print Settings to make sure the Raspberry Pi logo gets filled with a black filament.</p> <p>Print in PETG. Preferably Prusament PETG.</p>