MARMALADE: The Portable Open-Frame Matx PC case

Hi, I’m Strawberry Jam, the designer behind Marmalade.

Inspired by brutalist buildings and that hot 80s beige his open‑frame PC case is designed to look fun and industrial. Having an open frame PC is already very industrial, mayaswell play into it, with exposed bolts,  highly visible part numbers, and accenting features through parting lines.

Marmalade revolves around the 360mm AIO(radiator)  being its backbone -- or the hero.

Acting as both the visual centrepiece and the main structural element. The core frame of Marmalde bolts directly to the radiator, using it as a metal backbone that ties everything together, allowing for such a large case to be designed with minimal hardware.

All the parts connect like a jigsaw puzzle, and—like any good artist I stole—I borrowed Corsair’s clever nut‑and‑bolt assembly system (no threaded inserts needed). Here’s what inspired that approach: Corsair’s Platform Build Guide

The model is optimised for a 0.8 mm nozzle, which speeds up printing by reducing wall count while maintaining strength. Because of this, tolerances are generous—if you’re printing with a 0.4 mm nozzle, you might want to use a bit of superglue on the smaller non‑bolted joints for a snug fit.

For print settings, I used a lean infill strategy: aesthetic parts only use 1 wall and lighting infill, while functional components have varying wall thickness and adaptive cubic infill. Profiles for both 0.8 mm and 0.4 mm nozzles are tested, do use the correct ones as they have different wall amounts and infill.

An assembly guide is on the way (Blueberry Jam is working on it!). In the meantime, feel free to message me if you have questions or want build tips—I’m happy to help.

— Strawberry Jam