Project Karmosin

Inside a custom computer case showing a water cooling system with red tubes, a CPU water block, cooling fan, motherboards, memory sticks, and power supply.

2025

Red L-shaped object with a horizontal and vertical segment.
Red corner with white background
The image depicts a black and white diagram of a human head, showing the inside of the throat and mouth, including the vocal cords, airways, and parts of the respiratory system.

Impossible? Decide for Yourself.

Antec’s Performance 1m is a beautiful small form factor PC case… with a terrible layout.

Designed with no support for liquid cooling, and a miserable 2-fan capacity. We can do better.

This redesigned internal sandwich plate makes room for a 280mm radiator, and a full size D5 pump/reservoir. Without any external mounting.

Download dxf
Download dxf
Red L-shaped object with rounded edges.
Red L-shaped object on a white background
  • Close-up of a custom water cooling loop inside a computer case, with pink coolant flowing through transparent tubes and a red liquid cooling reservoir.
  • A custom-built computer with a water cooling system, featuring a black case with red accents, a Cooler Master radiator, and red water tubes inside.
  • Close-up of a custom-built gaming PC with a black and red color scheme, featuring a side panel with ribbed texture and visible internal components.
  • Close-up of a custom-built gaming or workstation computer with a black and red color scheme, featuring liquid cooling tubes, a visible circuit board, and other internal components.
  • Inside a custom-built gaming computer with a red and black color scheme, showing a water cooling system, power supply, and motherboard.
  • Close-up of a custom-built gaming or workstation computer with a transparent side panel showing internal components including a liquid cooling system with red tubes, and front I/O ports.
  • Close-up of a gaming computer's interior showing red coolant tubes and a black water cooling reservoir with the brand Arrowch visible.
  • Close-up of a custom-built gaming or computer desktop with a red metal frame, liquid cooling system, and black components, including a Cooler Master fan.
  • Top-down view of a custom computer with a liquid cooling system, including red coolant tubes, a water block, and visible internal components.

Specific Parts List

GPU: Asus STRIX GAMING OC GeForce RTX 2080

GPU Cooler: Bitspower Lotan VGA Waterblock

CPU: AMD Ryzen 7 9800X3D

CPU Cooler: Barrowch FBLTFHA-04N-V2

MB: Gigabyte B850I AORUS PRO

PSU: Cooler Master V SFX Gold ATX 3.0 850

RAM: Patriot Viper Xtreme 5 (2 x 24 GB) DDR5-8200

SSD: PNY CS2150 2 TB M.2-2280 PCIe 5.0 X4

Fans: (2x) Noctua A14 PWM ChromaX (Push Only)

Radiator: Black Ice ​Nemesis 28​0GTS

Pump/Reservoir: D5 Pump/Aquacomput​er ULTITUB​E 50

Fittings: EKWB Torque 14mm (Black)

Performance

Performance comparison chart for Borderlands 4k Low DLSS settings. Includes FPS, temperature, CPU benchmarks, and 3DMark scores.
Red electronic enclosure or case with black side panels and a large open interior, including a white square cutout, a black L-shaped component, and a row of vertical black lines on one side.

GPU

Max GPU Length ≤ 350mm

Max GPU Thickness (GPU+Waterblock+Fitting) ≤ 78mm *47mm Max CPU Cooler Height

Max GPU Height 189mm

CPU

Max CPU Cooler Height (Waterblock+Fitting) ≤ 85mm *40mm Max GPU Thickness

Memory

Max RAM Height

Radiator

Incompatible

Pump/Reservoir

Incompatible

PSU

Compatible with SFX and SFX-L Power Supplies

Motherboard

Compatible with Mini-ITX

Heads up!

Modern custom-built gaming or high-performance PC with water cooling, red and black color theme, and transparent side panel

GPU

Max GPU Length ≤ 303mm

Max GPU Thickness (GPU+Waterblock+Fitting) ≤ 71mm

Max GPU Height ≤ 159mm

CPU

Max CPU Cooler Height (Waterblock+Fitting) ≤ 67mm

Memory

Max RAM Height ≤ 51mm

Radiator

Compatible with 280mm and 240mm radiators

Maximum Radiator Thickness ≤ 31mm

Pump/Reservoir

Compatible with D5 Pump + Aquacomputer ULTITUBE 50

PSU

Compatible with SFX Power Supplies

Motherboard

Compatible with Mini-ITX

A curved black line on a white background, resembling a corner or an L shape.
A black rectangular shape on a white background, resembling the letter 'L' or a corner of a shape.
Close-up of a black L-shaped object against a white background.
Black letter 'L' on a white background.
An L-shaped corner with a black border on a white background.
Close-up of a black printed letter 'L' on a white background.

Out of Box

Red metal frame with multiple cutouts and mounting holes, likely a computer or electronic device chassis component.

I had been shopping for a small form-factor case in January of 2025. When I saw the release of the P1m I instantly loved the look. But more than that, I loved the idea of breaking it’s rules. Armed with a sketchbook and a pair of calipers, I began the dissection.

Proof of Concept

The main hurdle was creating enough space to add a necessary radiator (and later a reservoir) to the system.

I first moved the mounting locations of all the other components as high as possible. This provided an additional 30mm, which would allow a radiator to stack with the fans.

Red plastic straw bent at a 90-degree angle.
Red bent shape resembling a corner or angle
A technical drawing of a metal panel with notes, sketches, and measurements, including a labeled section for case fan screws and various handwritten dimensions.

First Mount Up

At this stage, I aimed to prove that the components would not overlap. It also gave an opportunity to determine an optimal path for wiring, tubing, and airflow.

A wooden frame or panel with multiple cutouts and holes, likely a component of machinery or equipment.

Revision 01

I corrected many of the inconsistencies and added mounting capability for a reservoir. However, there were unfortunately still clearance issues that persisted.

A custom-built gaming or high-performance computer with a red and black color scheme, featuring a liquid cooling system with red tubes, a Cooler Master power supply, an Asus motherboard, and various internal components visible through the transparent side panel.
Line drawing of a computer motherboard with two large rectangular heatsinks and an intricate graphic pattern in the top right corner.
Download Revision 03
Download Revision 03
A black metal computer mounting plate with cutouts for components and screw holes.

Revision 02

The plate now performed well enough to assemble the system. However, I continued to modifications for the best possible clearances and tolerances.

This “Revision 03” is available to download. It is nearly indistinguishable from the previous, but eliminated any post-process for end users.

Build Process

Red bent arrow pointing to the right.
Open red PC case with installed graphics card, motherboard, and power supply, sitting on a wooden table.
Sketch of an electronic circuit with wires, connectors, and annotations for parts like plug, pass-thru, and offset, with measurements and notes.
Sketch of a plumbing system with labeled inlets and outlets for water and drainage, including pipes, connections, and a rectangular box.
The image shows the interior of a computer case with red and black metal framing, a wooden panel in the middle, two computer cooling fans at the bottom, and some cables connected to components.
Hand-drawn diagram showing computer cooling system with CPU block, pump, two system fans, and power supply, with connections labeled.
A hand-drawn sketch of a metal or electronic component with various measurements and annotations indicating dimensions in millimeters. The sketch includes noted sections such as '4mm NOTCH' and measurements like 3mm, 8mm, 10mm, 15mm, 20mm, 22mm, and 30mm, with small stick figure icons indicating specific points or features.
Open computer case with parts on a desk, illuminated by natural light from a window.
A technical drawing of a rectangular object with detailed measurements, showing its length, width, hole diameter, and depth, with annotated dimensions and a cross-section view.
Red L-shaped object with rounded edges on a white background.
A red letter J with a thick stroke on a white background.
Hand-drawn sketch of a fortress with a star-shaped wall pattern.
Hand-drawn schematic of a motherboard with marked component mounts in different colors, measurements, and notes on modifications and design changes.
Handwritten diagram and mathematical calculations, showing a labeled sketch of a cylindrical object with a 5.7 mm diameter and summing some measurements to total 5.74.
Disassembled components of a 3D printer, including tubing, a heated bed leveling tool, screws, rubber rings, a marker, a screwdriver, and other small parts.
Handwritten notes listing different drill bit sizes and types, including 3.6mm, 2.8mm, and 3.6mm diameter bits, with annotations about standards and tap options.
Open custom-built gaming computer with water cooling system, black and red color scheme, mounted components, and transparent tubes.
Hand-drawn technical sketch of a flat, elongated part with dimensions, annotations, and measurements, including a bend and hole specifications.
Hand-drawn sketch of a connected structure with detailed measurements in centimeters, including a rectangle measuring 30.3 by 33 cm, a smaller section measuring 27.6 by 23 cm, and additional dimensions of 14.5, 21.3, and 30 cm. Circles are placed around the drawing as indicators or reference points.
A custom-built high-end PC with a water cooling system, featuring a black and red frame, transparent side panel, and visible liquid cooling tubes.
Sketch of mechanical part with circular and rectangular features, including dimensions in millimeters such as 12.5, 20, 21, and 18.5.
A graphics card with two large cooling fans, a geometric logo, and multiple ports.
Red angular shape on a white background

I am always striving to improve my design and presentation skills.

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