General Design:

• The pill holder is designed to be a compact and portable device, perfect for travel.
• It consists of two rotating parts, a base and a top, which interlock to form a cylindrical unit.
• Each rotating part has recesses designed to hold 3x2 mm magnets, ensuring the mechanism stays closed during transport.

Compartments:

• Seven individual compartments, each dedicated to a day of the week.
• Each compartment has the corresponding day name embossed on the front in easy-to-read lettering.
• The size of each compartment is calculated to hold a daily dosage of pills or vitamins.

Materials:

• Printed with biocompatible and impact-resistant plastic, such as PLA or ABS, to ensure durability and safety for medication containment.
• The magnets should be neodymium type to ensure a strong closure.

Dimensions:

• Overall dimensions will be pocket-sized, yet spacious enough to hold the necessary pills.

Color Scheme:

• Each day of the week could be printed in a different color to aid visual recognition, or colors can be user-selected for customization.

Assembly:

• The design should allow for easy post-print assembly, with notches and protrusions that fit together without the need for glue or screws.
• Magnets will fit into their respective spaces, possibly with a slight press fit or with a small amount of non-toxic adhesive if necessary to ensure permanence.

Final Considerations:

• The design should be optimized for 3D printing, avoiding the need for extensive supports or complex post-processing.
• It's important that the surfaces in contact with the pills are smooth to prevent residue buildup and facilitate cleaning.

This project would combine convenience, safety, and an intuitive design for those who need to carry their medications organized for each day of the week.