CR-10 S5 AC Hot Bed Control Cabinet with Thermal Protection (Home Assistant)

thingiverse

CR-10 S5 AC Hot Bed Control Cabinet with Thermal Protection (Home Assistant) CAUTION: It is highly recommended to have a qualified person handle any electrical work. Version 1: 8 Amp IEC Connector - suitable for smaller heated beds that draw 8 amps or less. Version 2: 12 Amp IEC Connector - ideal for larger beds that draw between 8 and 12 amps. I designed this out of necessity, as I couldn't find anything else to meet my requirements. This device provides thermal runaway protection for the AC silicone heaters used on the printers build platform. The temperature of the bed is actually controlled through the printer itself. There are heaters available with a built-in temperature controller, but I wanted to control the temperature through the printer's controller and Octoprint. The temp controller here is set up to cool down as the temperature approaches the set point (max temp you desire the bed to reach; i.e., 100c plus). It takes over when the temperature gets close to the set point, preventing severe overheating and potentially reducing the risk of a fire. I designed this around the CR-10 S5 mounted in the back, underneath on the 2040 rail. It may fit other printers but I haven't tested them. Sorry for any inconvenience. The circuits will work with other printers if you want to retrofit something. Home Automation Option: I have mine set up with Home Assistant home automation software. I have a smart outlet on the power cord for the Hot Bed cabinet and a D1Mini inside the cabinet. I run Tasmota on the D1Mini, using the alarm output of the temp controller as a switch input. The temp controller's alarm is set to trigger when the temperature approaches the set point. When this happens, the D1Mini sends a signal to the smart outlet, turning it off and disconnecting power from the hot bed. Optional Equipment: D1Mini Node MCU - MakerFocus 2pcs D1 Mini NodeMcu 4M Bytes Lua WiFi Development Board Base on ESP8266 ESP-12F N Compatible NodeMcu Arduino 5vdc Microusb Power Supply - 2-Pack 5V 2A Micro USB Power Supply Adapter for Security Camera Raspberry Pi and More by Security-01 Smart Outlet - Leviton DZPA1-2BW Decora Smart Plug-in Outlet with Z-Wave Technology, White, Repeater/Range Extender Equipment Instructions: Assemble the components and wire according to the schematic provided. Optional Equipment Instructions: The power 5VDC supply for the D1Mini will need to be split into two parts, one going to the case and the other to the circuit board. I unsoldered the usb cable, cut it shorter, and resoldered it. The AC line cables were replaced with 18awg THHN wires to reach the terminal block. For updates on my projects, join my group: https://www.facebook.com/groups/3DPrinterModding