Premium Refillable Notebook/3D Printed Modular Ring System

This is a 3D printed refillable notebook designed as a premium alternative to a standard binder.

I wanted to create a notebook that feels personal, functional, and unique — something that can hold finished notes, sketches, meeting pages, and loose sheets, while still looking like a carefully designed object rather than a basic office binder.

The main feature of this design is the custom modular ring system.

Instead of using standard metal binder rings, this notebook uses 3D printed rings that lock into the base. The rings are designed to be removable, replaceable, and scalable, so you can print new rings if needed or adjust the system to suit your own version.

The notebook is designed to be refillable and portable. You can add or remove pages, carry your notes to meetings, and keep your sketches organized in one place.

The design also includes an elastic closure system, brass screw details, rectangular ring openings in the cover, and optional book-cloth finishing for a more premium handmade look.

This project is ideal for anyone who enjoys functional 3D printed products, desk setup accessories, handmade stationery, and productivity tools with personality.

This is not just a basic binder.

It is a maker-friendly refillable notebook designed to look clean, feel premium, and be repairable over time.

Materials Required:

PLA or preferred filament
Elastic band for closure
M3 screws or brass screws
Book cloth or fabric covering
White glue, PVA glue, or bookbinding glue
Black end paper or decorative paper
A5 paper or custom-cut paper sheets
Optional brass hardware for a premium finish
Optional adhesive-backed felt or fabric for cleanup/details

Printing Recommendations

Material: PLA recommended
Layer height: 0.2 mm for the base and the top, the rest 0.1
Infill: 15% for the base, the rest 100%
Supports: No Support needed
Color: Up to you!

Test the ring mechanism first before printing or finishing the full notebook. The ring flexibility depends on print orientation, material, and thickness, so print a small test if you are adjusting the design.

Assembly Notes

Print all parts and test-fit the ring system before applying book cloth or final finishing materials.

The rings should be flexible enough to insert and remove pages, but strong enough to hold the paper securely. Do not force the rings aggressively; if a ring ever breaks, simply print a replacement.

For the premium finish, wrap the covers with book cloth and use end paper on the inside. Take extra care around the rectangular ring openings and elastic band holes for a cleaner result.

The brass screws are used as part of the elastic closure detail and also help give the notebook a more premium finished look.

Video Tutorial

Watch the full build video here: