My new PC case doesn't have a hard drive cage for the old 3.5" HDDs. I wanted to add some storage and don't fancy paying for an SSD while I have these hard drives so modelled a quick cage that will fit 3.5" HDDs. To mount your HDDs use #6-32x3/8" screws.

The model has four diamond shaped holes in the base so you can zip tie the cage into your PC case, I wouldn't recommend moving the case while the drives are running as it won't be very stable but it works for my use case.

I recommend printing the model so that the screw holes on the side have the triangle relief pointing upwards.

I tested this with a 0.4mm layer height on a 0.6mm nozzle in PLA and it works for me.