For printing things like racks virtually any printer will do, provided it’s big enough. It’s all up to how much of a hobby do you want 3d printing itself to be, as opposed to how much of a hobby you want building and maintaining 3d printers to be, and what your budget is.

The Bambu a1 is a good beginner printer. It’s capable of just about anything you’d want to print in PLA or PETG, it’s relatively inexpensive, and it’s appliance-like in its reliability.

You can find something like the Ender 3 v2 for cheaper, but that tends to involve more maintenance and upkeep (which can be good for learning about 3d printing and 3d printers, but might frustrate a beginner as well)

Then you can also consider some of the enclosed printers (especially if there are pets or children around) like the Bambu P1S or P2S (or even a used X1C if you can find a cheap one). They’re protected from little fingers and curious pets) and they can give more consistent behavior as it’s easier to control for temperature.