Snap! Tiles are designed for printability and ease of installation, with all of the STL and STEP files pre-oriented for easy slicing. I've printed these in both PETG and PLA without any problems with brittleness. The lock is purposely printed on its side to align the layers in the optimal orientation.

Installation is straightforward. Push the lock through the back plate, then use two fingers to press on the back of the lock, snapping both pieces into the case. You will need to do this before fitting the front plate onto the back plate to ensure a proper connection to the PC.