OneTop – Modular Top Enclosure for Prusa Core One / Core One + (MMU / INDX)

OneTop – Modular Top Enclosure for Prusa Core One / Core One + (MMU / INDX)

OneTop is a modular, magnetically mounted top enclosure for the Prusa Core One.
It installs without screws and is held purely by its geometry and integrated neodymium magnets.

The design follows the visual language of the Core One and aims to look like an OEM component rather than an add-on.

Updates

• 08.02.2026 added FAQ section.

• 07.02.2026 Hardware Kit in Pre-Order available at Blurolls (darker Panels, silver Screws):  https://www.blurolls3d.com/products/onetop-modular-top-enclosure-for-prusa-core-one-one-plus-designed-by-chipsnspools?VariantsId=11501

• 15.02.2026  step File for Panels uploaded

• 17.02.2026 added boring jig for pre-cut  panel

• 13.10.2026 : 

OneTop for CORE One L – Project Update

Hi everyone,

I'm really sorry for the delays and longer waiting times regarding the OneTop project.

Unfortunately, my father is seriously ill, and my family needs my attention and support during this difficult time. As a result, I haven't been able to dedicate as much time to the project as I originally planned.

However, development of OneTop for the Prusa CORE One L is still ongoing, and I'm doing my best to keep things moving forward.

I'm currently aiming for a release in December 2026.

Thank you all so much for your patience, understanding, and continued support. It really means a lot to me! ❤

Stay tuned, and happy printing!

chips_n_spools

Compatibility & Project Status

The INDX version is in beta status but mechanically complete and fully usable.

Key Features

• 🔩 Tool-less installation – no screws, no permanent modifications

• 🧲 Magnetic mounting – secure hold via integrated neodymium magnets

• 🧩 Modular construction – easy to extend and adapt

• 🔥 MMU-ready design

• 🧪 INDX-compatible (beta)

• 🧱 Prepared for heatset inserts for future upgrades

• 🧼 Clean, factory-style appearance that integrates with the Core One design

Mounting Concept

OneTop is held in place only by its shape and integrated magnets.
No fasteners are required to attach it to the printer.

The enclosure can be lifted off in seconds for maintenance or material changes while PTFE remaining securely positioned during operation.

Parts Overview

Printed parts :

• 4 × corner elements

• 7 × connector elements

• 1 × PTFE guide module MMU / INDX Version

• 2 x Handle left/right

• Optional: Front Handle (decorative Element)

Additional parts:

• 4 × side panels made from 3 mm polycarbonate

Hardware Requirements

Print Recommendations

Filament Usage: ~ 1kg (main Color) ,  ~ 70gr. Accent Color.

Filament Calibration (IMPORTANT)

Before printing the enclosure parts, proper calibration is required.

1. Print Tools/calibration.stl  (Cube 50x50x10))

2. Measure dimensional deviation

3. Apply correction in PrusaSlicer → Filament Settings → Advanced → XY Compensation

Correct calibration is essential to ensure proper fit of the frame and panels.

Modular Upgrade Platform

Thanks to multiple integrated mounting points and optional heatset inserts, OneTop is designed as a platform for future extensions, such as:

• LED lighting -> 

• Servo-controlled air vent (using the original lid)

• Controlled Air-Vent with INDX 

• Front ventilation grille 

• Additional functional modules

• Build Your CoreOne Castle (with OneTop support) 

Support & Future Development

OneTop is part of an ongoing development effort focused on high-quality, well-integrated upgrades for the Prusa Core One platform.

If you enjoy this project and would like to support future development, your support helps enable further work , including the acquisition of a Core One L, which will allow me to develop OneTop and additional upgrades specifically for the large-format machine as well.

Support is entirely optional, but always appreciated.

Remix Policy

Remixes are currently not enabled.

The design is still under active development, especially regarding INDX and MMU configurations.
Once the project has reached a fully stable state across all supported setups, remixing may be enabled in a future release.

Thank you for your understanding.

Credits

Designed by chips_n_spools

Feedback is welcome.
If you build OneTop, feel free to share your setup and results.

FAQ:

How much height does it add to the Core One?

– It adds about 163 mm in height.

Will there be a Core One L version available?

– Yes, I will make a Core One L version. It will be available in a separate listing.