Edit: I modified the base so that it has protruding tabs that hold the board tightly to the bottom. Simply angle the board in underneath the longest tab then snap in the other side. I also modified the top so that it can accommodate the jumper on the other side of the board.

This is a case that I created for a programmer you can get from Amazon here at this link:

https://www.amazon.com/gp/product/B07VN39HNL

The case snaps together quite nicely. on the inside channel where the hooks fit into, I angled the backside so that it fits in nice and snug yet it's really easy to take apart with a small screwdriver, just put a little pressure onto the bottom of one or two tabs and lift gently on the lid and it comes right off.

When putting the lid on, its easier if you angle in three posts first then when you bring the other three down, just gently push in on the tabs until the hook is resting into the channel then press down on the top and it should snap right in.

I added some rounding contour because the first design had a ton of sharp corners making it a little weird to handle ... but now it's perfect ... at least I think so. ☺

I printed this with PLA USING SUPPORTS at 195 degrees on a cold plate with just a little glue stick to hold it to the plate. I printed at .10 mm per layer at a speed of 50mm