Component tester M12864 case w/ 18650 battery holder
Description
Case for the M12864 component tester, doesn't cover SMD pads, covers signal generator pads and the other 3 holes for testing. Includes back plate to hold 3x 18650 batteries, providing 12V to turn it on. It does run on 3 cells without problem, but it will also run on 2 cells. The lowest I've tested is 6 volts and it will say the battery is weak, but that's already a pretty low voltage for the lithium battery. If you use 3 cells remember to recharge them when they drop below 9V. Other than the case you will also need 4 screws, I'm using 3x12 wood screws but M3x12 countersunk screw will tap in the hole and fit in length (which is 15.1mm for the two short ones and 19.6 for the two longer ones, including the spacing of the board, including the head since they're countersunk). The latch is held in place with a metal clip, I tried adding small nails instead but it was a pain, feel free to try it out if you want. I added 1.7mm to the back latch height so you can store the calibration capacitor back there, but don't do it if you carry it around a lot. I also included a 0 offset latch in the STEP parts in case you want to make your own offset, but don't print it as is because it will not latch properly since there's no gap with the frame. I've enlarged the lever slot because in mine I had to sand down the top of the lever a bit, tell me if it fits because I haven't printed it again for such a small change. My batteries all go in the same direction because it was easier to wire them on the back than to alternate the springs. Springs are just made with steel wire, they're brazed together with tin solder, but you can also braze copper wire on the spring, it's easier to do. REMEMBER TO PUT INSULATION TAPE ON THE BACK OF THE TESTER. This is very important, I've used a layer of kapton and some other kapton to make sure the steel connections don't accidentally short together or something, though that is not required if you place them well. Step file is included with all the parts and the dummy if you want to modify something in your CAD software. The STL dummy is just for show. Print notes You will need support enabled to print the parts, I've already rotated the STLs in the position I printed them. I used a 0.5mm nozzle to print the parts at 0.25mm layer height.
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