Autoswitch OFF for Tevo's Black Widow

myminifactory

Autoswitch for Tevo's Black Widow Autoswitch was designed to shut down the printer immediately or after a preferred time once it finishes printing. No more headaches from leaving the printer powered on or forgetting to turn it off, even remotely or by calling home to have someone manually turn it off. This is also the cheapest and most hassle-free option, as it works instantly. PDF guide included! You'll only need: One slide switch (like this one: https://www.ebay.com/itm/10-Heavy-Duty-4PDT-125V-250V-6A-Slide-ON-ON-Switch-S201-ling/321039564222?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649) Download and print the parts you'll need to add. Add a G-code line at the end of the print, before disabling the motors: "G1 Y235; serve print." The number on the Y-axis should be around 230-240, depending on your build area. Moving further away will provide better security against powering down the printer while it's printing. To find your Y-axis position to set up the autoswitch, go to home all axes and move the Y-axis to the spot where you want to set it up. Use the number of the Y-axis you already moved (add a few more millimeters for better results) and tighten the autoswitch. You can also make the printer cool down the hotend before moving to the autoswitch by adding this line: "G4 P300000; wait 5 minutes" before "serving the print." (See the example in the PDF guide.) 1.50-2.00 meters of dual cable (schematic on the PDF guide) 2x M4 screws with 2x hammerhead nuts for the bracket 2x small PC screws (usually from laptops will fit; if the pusher barrel is loose, you'll need one extra screw to tighten it) 1x M3 bolt with 1x M3 hex nut or 1x M4 screw with 1x M4 hex nut (two models are uploaded for both sizes of bolts) to secure all wires with the cap into the bracket 1x spring with 0.8-10mm wire diameter, 12mm outer diameter, and a length of about 20mm. However, this might not be easy to find, so I designed the switch pusher as solid in one piece. Keep in mind that I haven't tried it yet, so if you're facing any problems, let me know. You can also add another switch of the same type (referred to on 1) for disabling the autoswitch and using the manual switch or replacing the main manual switch to avoid all these wires. After all this, read the PDF guide for assembly and wiring schematic/diagram to set up all the wires. Note that this may be applied to other printers with modifications or not, or might need a whole new design, as I couldn't do it due to not owning any other printers. Warning! Leaving your printer on is not secure at least; you should have smoke detectors and fire extinguishers nearby, so leaving your printer with this switch working on is your own risk. This is the semi-final product that works pretty well but still can be improved (this will happen by gaining experience with it and finding weak points). Your feedback will help too, so if you have any suggestions, I'd love to hear them.