This model contains printable mounts for castor wheels.
It should be compatible with wheels with 35x28mm hole spacing. I personally used a set of castor wheels bought at the local Dollar store (Action).
Any other hole spacing requires editing the model.
The wheels can be screwed in with the same size screws as the case, however you may not have enough of those, In that case any similar sized screw will do.
I would highly recommend screwing the feet into the bottom of the case, as these wheels will create a lot more stress on the mount than the standard feet. To add to that, 3d prints are also generally weaker. 1 screw per feet should probably be fine, but I included 2 for good measure.
To use the model just grab it from the Output folder, there are both and a left handed version, you should print 2 of each.
Install the requirements from requirements.txt, probably best in a clean python venv.
The model is written in the build123d python library.
Do note that the model is in no means optimized, there are some hard-coded values in there.
There are little to no comments
If you just want to adjust the hole spacing you only have to touch 'X spacing' and 'Y spacing' in the config file.
This should generally be safe.
This model includes sample feet made by coolermaster, they can be found here: https://www.printables.com/model/588842-qube-500-sample-holders