January 22, 2019
Description
This is the original design:
https://www.thingiverse.com/thing:2918314?fbclid=IwAR1369WlQhx5IY4qgKhnGd_VpHcxdyWn3cV-7UitN58M9w2DlGEJLMm0AuE
Here are some of the improvements and additions I've made:
Required components:
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:
https://zaribo.com/other/42-original-prusa-zaribo-edition-rubber-feet.html
Instructions:
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. I connected them to the power intput of the Rambo board, fixing them together with the PSU power cables, using the Rambo screws.
b. Connect the input to the PSU (or Rambo) power (24V). Watch the polarity!
c. Use the potentiometer on the buck converter to adjust the output voltage to 5V, using a multimeter.
d. Cut a cable with an L-shaped micro usb connector at a length of about 8 cm.
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.
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!
If you plan to use a buck converter:
a. Print the buck converter case, you should check if your particular converter fits in the case
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.
c. Stick 2 small pieces of electrical tape on the screw heads to avoid any risk of electrical contact with the Raspberry pi board.
Mount the right panel support on the exterior of back panel, by sliding it about 30mm from the side where the triangular ventilation holes are.
Cut 4 pieces of cotton swap (the plastic tube part) to be the same size as the spacers.
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.
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.
Mount the printed spacers on the Raspberry board, by sliding them around the tubes.
Mount the 3.5" TFT screen on the Raspberry Pi board using the GPIO connector.
Mount the whole assembly on the right side of the main panel using four M3x10 screws.
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).
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.
Connect the 2 ribbon cables to the LCD screen.
Using the original screws and square nuts, mount the whole panel to the printer.
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.
Using the cable clips, pass the power and USB cables ( I also use the same clips for the camera USB cable).
Connect the power cables to the PSU or Rambo board.
EDIT: for GUI, I'm using Octoprint-TFT:
https://github.com/darksid3r/OctoPrint-TFT
License:
GNU - GPL
darksid3r
