Controller box

thingiverse

Wiring a switch / control box with display helps monitor output to the printer controller. Total cost: $10 USD. Printed in PLA at .20mm layer height without raft. Support material is ON. Heated bed temperature: 55C using kapton tape. Instructions: Follow the schematic carefully! Don't have AC plugged in while wiring meter and PSU - use common sense. The meter can handle up to 30V, 50 amps, far beyond any 3D printer requirements. Red wires are 12v or 24v, black is ground. AC load connects with a Black wire switching to Load input of the PSU. Yellow represents amperage signal / sense, while Grey shows AC white wire. Green indicates AC ground. Note: If you're using a RAMPS board, adding a 5V regulator to your PSU's 12V output or dedicating a separate 5V supply allows running the Arduino Mega micro-controller separately. This setup can support up to 15 volts, provided that the Ramps capacitors are rated for at least 25v and the diode is removed, cut, or not installed. The meter was sourced from eBay and the switch from any auto parts store. For high-amp applications, use 10 gauge or thicker wiring. Accurate readings of .01V and .1 amps can be expected. Calibration may occasionally be required but most meters come pre-calibrated.