Modular Tool Holder System for Prusa Core One/+

Modular Tool Holder System for Prusa Core One/+

Module Dimensions

• Base module and tool holders: 20 mm wide

• Spacer module: 10 mm wide

• Magnet slot / lock plate size: 6x2 mm

Key Features

• Fully modular and configurable design

• Tool-free mounting: stays in place without screws or magnets

• Optional locking using screws or magnets

• Side-to-side expandable base modules

• Wide range of tool holders, including universal options

• Optional cosmetic side trims

• Designed specifically for the Prusa Core One/+

The main focus of this system is flexibility. You can build the tool holder exactly to your needs, rearrange it at any time, and expand it as your tool collection grows — all while keeping a clean, stable setup directly on your 3D printer.

Base modules can be connected side-to-side, allowing the tool holder to be expanded horizontally to any width. Onto each base module, you can attach a variety of tool holders designed for different tools, such as pliers, Torx drivers, screwdrivers, brass brushes, wrenches, sockets, and more. Some holders are universal, making them suitable for multiple tools or general-purpose storage.

If screw locking is not used, the tool holder can be repositioned freely, allowing more versatile use—for example, the entire holder can be removed completely or relocated to the opposite side of the 3D printer.

The system is based on a base module that naturally stays in position on the printer frame through its geometry. If desired, the base can be optionally locked in place using screws or magnets, but this is not required.

For visual customization, optional side trim pieces can be added to the ends of the rack for a better appearance.

The system also includes a spacer module, which does not hold any tools. Its purpose is to create additional spacing between tools for better accessibility or layout balance. In addition, a blank tool holder can be mounted onto a standard base module if no tool holder is needed in that position.

Instructions

• Print the base part

• Choose the base part:

• Base_part_20mm OR

• Base_part_20mm_with_mounting_holes

• Both base parts can be placed side by side and locked into each other.

• Folder: Base parts and ends

• Print the tool holder

• Choose the holder you need (e.g. Allen keys, sockets, screwdrivers, brush, etc.).

• Tool holders are universal and fit all original and alternative base parts.

• Folder: Tool holders

• Push the tool holder into the base part

• If removal is needed, the tool holder can be pushed out of the base using the screw hole.

• Optional – add locking components

• If needed, install magnets (Prusa 10×6×2 mm or 20×6×2 mm magnets) or print a base locking plate.

• Folder: Optional

• Optional – Right and Left Base End Pieces

• Decide whether to use the left and right end pieces based on your setup. Make sure to press them firmly against a flat surface.

• There are two sizes of end pieces: one for the 20 mm base and one for the 20 mm base with mounting holes.

• Folder: Optional

• Optional - add screw covers

• Add screw covers to the 20 mm base with mounting holes.

• Folder: Optional

• Optional - additional space between base parts

• If needed – print a 10 mm spacer or print a 20 mm base and an empty tool holder.

• There are two versions of the 10 mm spacer, but both versions are compatible with all base parts and spacers.

• Folders: Base parts and ends and Tool holders

Other versions

• OLD version

• The first and original version.

• Compatible with all tool holders.

• Not compatible with other base part versions for side-by-side connection. The blue circle in the image highlights the difference.

• Folder: Old version (original files, see version desc.)

• Alternative version - Raised 9 mm

• Compatible with all tool holders.

• Not compatible with other base part versions for side-by-side connection.

• Folder: Alternative version (Raised 9 mm, see version desc.)

Updates & Changelog

• 08/02/26: Rearranged files and added one photo

• 08/02/26: Added a new tool holder: nozzle holder (Nozzles_Tool_holder_v1)

• 14/02/26: Added folders

• 14/02/26: Added alternative version (Raised 9 mm)

• 14/02/26: Added alternative version (Truncated)

• 14/02/26: Updated instructions

• 15/02/26: Moved the original base parts (base, spacer, and end pieces) to a new folder: Old Version.

• 15/02/26: Rearranged files and folders

• 15/02/26: Rewrote instructions

• 08/03/26: Added new main photo

• 08/03/26: Added a new tool holder: A large hook (Large_Hook_Tool_holder_v1)

• 13/07/26: Added Thingiverse-link

Note

The same version of this model is also available on Thingiverse. For documentation, printing instructions, updates, and the changelog, visit: https://www.thingiverse.com/thing:7382691

License

Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)

You are free to:

• Share — copy and redistribute the model in any medium or format

• Adapt — remix, transform, and build upon the model

• Use commercially

Under the following terms:

• Attribution — You must give appropriate credit to the original author

• ShareAlike — If you modify the model, you must distribute your contributions under the same license

This model is provided as-is, without warranty. Use at your own risk.

Design and description by hämppis , licensed CC-BY-SA.