Case for MKS Gen L, Meanwell LRS 350-24 or Stock Ender 3 PSU, 2 MOSFETS, Raspberry PI 3 and buck converters

thingiverse

This appears to be a step-by-step guide for upgrading and assembling an Ender 3 printer. Here's a breakdown of the instructions: **Upgrading the Printer** 1. **Print back panel**: Print a new back panel with an 80mm fan attached, blowing out of the case. 2. **Rewire the fan**: Rewire the fan with a JST-SM male 2-pin connector. 3. **Print side panels**: Print and connect the side panels, inserting buck converters after soldering. **Connecting Buck Converters** 1. Connect inputs to the 24V rail (either put wires to the nearest mosfet inputs or use the 24V output of the MKS). 2. Connect one converter for the extruder fan to a 12V output. 3. Connect another converter for the front and back fans to a silent setting (around 10V). **Preparing Wiring** 1. Prepare wiring for: * Bed heating mosfet * Extruder heater mosfet * Stepper drivers to stepper motor cables * Endstop switches * Thermistors (bed and extruder) * Part cooling fan **Assembly** 1. **Double-check wiring**: Use a multimeter to verify connections. 2. **Secure Raspberry Pi power cable**: Find a good path for the Raspberry Pi power cable and secure it to the stands and bottom plate. 3. **Print top panels**: Print new top panels. 4. **Patch Raspberry Pi with Octoprint**: Install Octoprint on the Raspberry Pi. 5. **Patch MKS GEN L with Marlin**: Install Marlin on the MKS GEN L (detailed instructions for Ender 3 in a YouTube video). 6. **Install printer components**: Attach the Raspberry Pi and MKS to the bottom plate. **Final Assembly** 1. **Double-check wiring**: Use a multimeter to verify connections. 2. **Check PSU voltage**: Ensure the PSU is set to the correct voltage. 3. **Connect to power**: Connect the printer to power. 4. **Dial in buck converters and stepper drivers**: Use a multimeter to adjust the buck converters and stepper drivers as needed. **Testing** 1. **Shut down and connect wires**: Disconnect from power, then connect all wires to the rewired printer wires. 2. **Power up and test axes**: Power up and use Octoprint to check axis movement (X, Y, Z). 3. **Check temperature readings**: Verify that Octoprint shows room temperature on both bed and extruder. 4. **Heat extruder and check direction**: Heat the extruder to a low temperature, then set it to 200C and verify that it turns in the correct direction. 5. **Check bed heating**: Verify that the bed is heating correctly. 6. **Power down and reverse axis (if necessary)**: If an axis is moving in the wrong direction, power down, reverse the axis in Marlin, flash again, and retest. **Final Steps** 1. **Screw on top panels**: Attach the top panels to the case. 2. **Do a bed leveling test**: Perform a bed leveling test before your first print.