You can find .stls of two versions: The regular version and a loose fit version. Depending on the machine, filament, and calibration, one or the other might be better. In doubt, I recommend printing the caps first and comparing the sizes before printing the body. If needed, using pliers to insert and remove bits a few times with some heat applied can help loosen the slot.
They were designed to be friction fit, but you have the option to glue 4x2mm magnets as a way to hold the bits.
They were designed to be printed standing up. Please use a brim and regular supports. For bambulab users, feel free to use my print profile.
Here is a step-by-step set of pictures with all necessary support removal:
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Happy printing!