6-90V 15A PWM Speed Controller Enclosure

thingiverse

This is a protective casing for a widely available Chinese speed controller that can be easily found online. There are several affordable speed controllers on the market, and this one often comes under the name "6V-90V 15A PWM DC speed controller." I purchased my unit about six years ago, which had a blue circuit board; however, newer models typically feature green boards but maintain the same layout. Inside this casing, there's space for an SPST on/off switch with a small alignment nub, the control potentiometer, and a 40mm 12v fan that fits snugly inside. I connected the on/off switch to the DC input along with the fan so everything turns on when you flip the switch. For my 12v input, I used a modified computer power supply, but you can use whatever input/output setup works best for your needs. The output connects directly to a salvaged electric scooter motor that I believe originally ran on 24V, but it functions perfectly fine on 12v. Since I'm using this setup for a homemade clay throwing wheel and don't require much speed, the electric scooter motor seems to have ample torque. The controller itself doesn't heat up excessively, so adding the fan ensures it won't overheat even with heavy loads. The slots for air outflow can be tricky to print, especially if you're not careful with your retraction settings; however, they should print without issue as long as your settings aren't too high. Since I have very high retraction settings, my fan grills ended up a bit thin and underextruded. Important note: Hardware used - I specifically designed this casing to use eight #6-1/2" sheet metal screws commonly found in kits like the harbor freight "347 pc Nut and Bolt Assortment." Four of these bolts secure the board in place, while the other four hold the top half onto the bottom half. A standard #2 Phillips screwdriver shaft fits nicely into the holes on top where the screws fall into. Be cautious not to overtighten, as PLA can let go if subjected to high torque; instead, aim for a snug fit. I also used an XT60 60 amp remote control electric motor airplane connector for my motor connection, which allows me to connect the motor without having to disassemble the speed controller again later on. This setup also gives me the flexibility to use the controller in other gadgets should I need a motor speed controller for another project. Enjoy! Examples of this board can be found at: https://www.ebay.com/itm/6V-90V-15A-PWM-DC-Motor-Speed-Control-PWM-Controller-12V-24V-48V-64V-72V-1000W/173177078863?hash=item285228844f:g:H5QAAOSwvR5aPlvU https://www.ebay.com/itm/6V-90V-15A-Pulse-Width-Modulator-PWM-DC-Motor-Speed-Control-Switch-Controller/162836712937?epid=1960103853&hash=item25e9d30de9:g:3kwAAOSwUVNaTzA7:sc:USPSFirstClass!60148!US!-1