This inexpensive little component tester is a marvel, but it’s bounced around my desk for a while. Fortunately I found an enclosure for it that allows access to the test points and the activation button.
Fortunate, because testers of this type were all the fad about 2012, when I bought this one (probably from a Chinese parts website). So, when I found it on Thingiverse, I had to print it to see it. Unfortunately, the top involves an unsupported angle, and so the slicer has to add support underneath. Given that it’s printed face-down, part of the external surface ends up not being smooth.