SSD Relais case aluminium 2020 - customizable

thingiverse

!!!!!!!!!CAUTION!!!!!!!!!!!! Be extremely cautious when making modifications at the electrical line! Always disconnect the power cord! I will not be held accountable for any damage to your printer or your body that might occur due to this description. ONLY perform this procedure if you are confident in what you are doing! !!!!!!!!!!!!!! This is a customizable enclosure for my SSD relay I installed to enhance the security of my 3D printer. The SSD relay serves as a switch for my 12V and 24V power supply for the motor and heating elements. The SSD relay will be controlled by a signal from my Arduino Due. This could be configured to an empty signal at the AUX connector. My SSD relay already functions at 3V, therefore there is NO need for an additional power converter to 5V or 12V because the Arduino Due generates 3.3V I also added two thermal fuses, one of 285 degrees Celsius at the hot end - make sure you place it far away from the heating element but connected to the hot end - the best is at the opposite side from the heating element I guess. And a second thermal fuse with 100 degrees Celsius under at the printing area at the heating element. The SSD relay control signal first goes in series to both thermal fuses and then to the SSD relay. If any fuse fails, the SSD relay will lose its control signal. There is also a ground signal going directly to the SSD relay. The SSD relay may generate some heat, therefore it is directly mounted to the 2020 aluminum profile. There is an extra space in the case. Because of this the aluminum profile should have a connection to the ground. I operate the printer with a Raspberry Pi and the OctoPrint software. This enables me to automatically shut down the printer after the print and when the hot end has been cooled down - there is an additional plugin for this. It is also possible to switch the power supply for the heating elements on and off from OctoPrint as the Arduino gets its power from the USB cable connecting both computers. It might be necessary to enable the Power feature in your software. I implemented this in the Marlin software and by defining the following in the configuration.h file: #define POWER_SUPPLY 2 #ifndef PS_ON_PIN #define PS_ON_PIN 23 // D23 AUX-4 Pin 16 #endif In this example at the PIN D23 is the power control signal. This is AUX-4 Pin 16 on the RAMPS-FD board. This combination works perfectly from my perspective and increases security. In case a heating element overheats the device - due to any reason - the SSD relay will lose its controlling signal and the 12V and 24V power supply for the motor and heating elements will lose their power. I printed the enclosure with transparent PLA so I can see the SSD relay ON state indicated by a small LED on top of the relay.