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Filament Sensor (no software modifications needed)

Filament Sensor (no software modifications needed)

prusaprinters

<p>I am not comfortable with changing the software needed with a low-voltage filament sensor input to the printer. &nbsp;I modified a short extension chord that is connected in series with the printer input power cable and wall outlet. &nbsp; The modification adds a micro switch to the filament feed and turns off power to the printer when there is no more filament. &nbsp; The Ender 3 knows where to restart when the filament is added to the printer after the loss of power (for any reason). &nbsp;See the schematic.</p><p>The power turns on as soon as the switch senses there is a filament, so I switch off the printer power when installing the filament.</p><p>Connections need to be soldered and insulated with heat shrink tubing.</p><p>If you are capable of modifying code, you could use the mechanism to interface with the low-voltage side of the printer. &nbsp;There are several U-Tube explanations for that approach.</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; CAUTION:</p><p>IF YOU ARE NOT FAMILIAR WITH 120 volt WIRING AND SOLDERING, DO NOT USE THIS 120-VOLT POWER CONTROL SYSTEM. &nbsp;If you are capable in this area, the micro switch and wiring are rated well above the 350 watts (3 amps max) consumed by the Ender.</p><p>BE SURE TO PUT THE MICRO SWITCH IN THE HOT LEG OF THE POWER. &nbsp;PLACING IT ON THE WRONG LEG IS A HIGH RISK TO YOU.</p><p>You could use this mechanical design and limit switch to interface with the low-voltage system, but you will have to provide the required software modifications.</p><p>There are several adjustments (position and angle of microswitch and feed pulley) that support installation on a variety of printers.</p><p>Store-bought parts: &nbsp;</p><p>Extension chord, &nbsp;~1.5', 3 wire, rated 5+ amps, 120 volt AC &nbsp;</p><p>16 Ga copper electrical wire ~20'</p><p>&nbsp; Microswitch, 1 each (Amazon, 250V, 5 amp, SPDT, 1 NO, 1 NC, Roller Lever, URBEST STORE (or others) cost $6.99 for qty 10</p><p>&nbsp; For attaching Microswitch:</p><p>&nbsp; &nbsp; &nbsp; &nbsp;2 each: &nbsp;Bolt - 2 mm x 10 mm; Nut - 2 mm; Flat Washer - 2 mm; Lock Washer - 2 mm</p><p>To insulate soldered items: &nbsp;560PCS Heat Shrink Tubing 2:1, $6.00</p><p>For assembly of printed parts:</p><p>&nbsp; &nbsp; &nbsp; &nbsp;6 each: &nbsp;Bolt - 3 mm x ~10 mm; Nut - 3 mm; Flat Washer - 3 mm; Lock Washer - 3 mm</p><p>&nbsp; &nbsp; &nbsp; &nbsp;2 each: &nbsp;Bolt - 3 mm x 6 mm to fasten “T” between Aluminum Extrusion and Horizontal &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; to Beam</p><p>&nbsp; &nbsp; &nbsp; &nbsp; 1 each: &nbsp;Bolt - 3 mm x ~4 mm for the cap to secure the pulley to the axle.</p><p>Capricorn Feed Tube:&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2 each: &nbsp;~ 10 mm long</p><p>&nbsp;&nbsp;</p>

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