Component tester M12864 case w/ 18650 battery holder

thingiverse

The case for the M12864 component tester doesn't cover SMD pads, but it does cover signal generator pads and three holes for testing. This includes a back plate that holds three 18650 batteries, providing twelve volts to turn it on. It runs perfectly well on three cells without issue, but it will also run on two cells. The lowest voltage I've tested is six volts, and it says the battery is weak at that point, which is already a pretty low voltage for a lithium battery. If you use three cells, remember to recharge them when they drop below nine volts. You'll need four screws in addition to the case. I'm using 3x12 wood screws, but M3x12 countersunk screws will tap into the hole and fit perfectly in length - that is, fifteen millimeters for the two shorter ones and nineteen point six millimeters for the two longer ones, including the spacing of the board and the head since they're countersunk. The latch is held in place with a metal clip. I tried using small nails instead, but it was a hassle. Feel free to try it out if you want. I added one point seven millimeters to the back latch height so you can store the calibration capacitor there, but don't do that if you carry it around a lot. I also included a zero offset latch in the STEP parts in case you want to make your own offset, but don't print it as is because it won't latch properly since there's no gap with the frame.