Case for AVR component tester

This is a case for a variant of the quite wonderful universal transistor and component tester developed by Markus Frejek, and later Karl-Heinz Kübbeler. A full description of the project is available here:

http://mikrocontroller.net/articles/AVR_Transistortester

This case fits a kit sold by Banggood, see http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html

There is one version of the case bottom with holes for M3 countersunk screws. The other version is a pure snap lock, which I think works well enough. This version also has an internal structure that allows screws to be retrofitted.

There are also two versions of the button; one with a collar that fits over the switch, and the alternative version with a flat bottom.

Cases for variants with a larger graphical display are available here: http://www.thingiverse.com/thing:797733 here: http://www.thingiverse.com/thing:694790 here: http://www.thingiverse.com/thi