Description

After almost two months of prototyping, resistance testing and assembly under real-life conditions, every part of this open PC case has been fine-tuned to offer reliability, aesthetics and true modularity. All components have been designed to integrate seamlessly with standard PC hardware (GPU, power supply, HDD, SSD, power button, etc.), while maintaining full compatibility with 2020 T-slot profiles, whether 3D printed or standard aluminum.

This project was born of a simple objective: to create all the parts of a premium, fully 3D printable open PC case, offering a DIY experience of comparable quality to commercial products costing between €50 and €100, without compromising on assembly quality or usability.
Mission accomplished.

Designed for T-slot 2020 profiles

All parts are designed around the geometry of standard 2020 T-slot profiles. Although printed PETG (or similar materials) does not match the structural rigidity of aluminum, it remains perfectly suited to this type of open-air enclosure, where mechanical stresses remain low and stability depends mainly on the overall design of the chassis rather than extreme load resistance.

Once assembled, the structure offers excellent rigidity for everyday PC use, including gaming and workstations.

All you need are M4 × 10 mm screws: all holes, threads and anchoring points are dimensioned for reliable M4 fastening.
M4 is the best compromise between M3 and M5, works perfectly with 2020 profiles and prints cleanly with a standard 0.4 mm nozzle.

Scalable and modifiable

With the 3D files supplied, you can easily adapt or enlarge the chassis for other motherboard formats (ITX, ATX) or even reuse certain parts for DIY 3D printer enhancements or other custom projects.

The 23 cm 2020 profiles shown in the photos correspond to the practical height limit (Z axis) for most 3D printers with 230 × 230 mm platens.
Coincidentally, 23 cm is exactly the length needed for a mATX motherboard format.

Why €19.90 is a bargain

This STL package lets you build a fully functional mATX open-air PC case with 12 fully 3D printable parts.

Consider this:

A comparable mATX open-air PC case generally costs between €35 and €100.
With this package, you save money and shipping costs, while retaining total control over materials, colors and printing parameters.
The design is modular, optimized for maximum airflow, and fully compatible with 3D-printed 2020 (or aluminum) profiles.
You receive 12 ready-to-print parts, designed by Apiobi, including supports for GPU, power supply, storage and power button.
Once you have the files, you can print as many cases as you like, for your own personal use.

For €19.90, you get a fully customizable premium PC case experience, for a fraction of the price of a physical product.
Perfect for makers, gamers and DIY enthusiasts who want a unique configuration.

Parts included

You're about to download no fewer than 12 components, all optimized for strength, printability and ease of assembly:

Profile 2020 «aluminum type» (standard geometry, printable; supplied as a 10 mm segment to be resized in Z in your slicer)
Cross-junction plate - T
90° square with 4 holes
2-hole 90° bracket
GPU bracket holder
Handle
Mounting bracket for mini power button (see photo of button model)
Mounting bracket for 2 × 2.5″ disks
Power supply mounting bracket (PSU bracket)
End cap for profile 2020
M4 nut for T-slot
T-slot spacer nut for motherboard mounting

Design choices and voluntary limitations

Creating a fully 3D printable PC case required certain compromises.
This model includes everything needed for standard gaming or workstation configurations, but I've deliberately chosen not to design some of the more specialized accessories.

For example:

Dedicated support for cooling modules
Advanced GPU support system
A wide range of customized spacers (various lengths and shapes)
Various mounting options for power buttons (reset, LED HDD, etc.)

These additions would have added considerably to the complexity, without serving the main objective: to offer a robust, functional, uncluttered and fully 3D printable base, covering standard needs while remaining simple to print, assemble and modify.

The story behind the project

Tired of traditional closed PC cases, I first used these parts to build a compact 1080p steambox PC (visible in the photos). Encouraged by the result, I then rebuilt my professional workstation using the same system, making it much more portable.

My next configuration is already planned: an open-air chassis dedicated to retro-gaming, with a focus on classic arcade games.

If you're reading this, you probably have your own project in mind.

Have fun building a machine that reflects your style - and feel free to share photos of your creation.
I'd love to see what you come up with.

Technical Tips for 3D Printing

Advice for all components:

Material : Print in PETG, ABS or any other durable material suitable for your use. PLA is not recommended due to insufficient strength for this type of project.
Filling : 100 % for all parts to ensure maximum rigidity and stability.
Layer height : Most parts can be printed in 0.2 mm.
Exception: Visit T-slot nuts, with M4 threads must be printed with a maximum layer height from 0.12 to 0.16 mm to obtain a precise thread.
Supports: Not required for any part, unless you wish to support the top of certain holes - but this is optional.

Specific instructions for T-slot 2020 profiles :

Print profiles vertically to obtain the best dimensional accuracy.
The 3D model supplied corresponds to a 1 cm segment ; in your slicer, you must enlarge or stretch in height (Z axis) to obtain the desired profile length.
To prevent the 2020 profile does not peel off or tip over during printing, use a brim or basic reinforcement, recommended to 10 % of profile height.
Use PETG or ABS, with 100 % filling for maximum rigidity.

These recommendations and your 3D printing experience will enable you to manufacture components solid, precise and perfectly compatible for assembly.