Case Minimalist BC-250 (Minimalist BC-250 Case)

Updates

10-feb-2026 : PSU plate is more open to allow for other brands, such as Fortron or Apevia. Also, there's a new revision of Model 200, which now share the same back and handle parts as Model 240. You can print both fronts and have a try !

07-feb-2026 : active [back-plate & PSU] cooling & improved airflow for Model 240

Introduction

This set of cases was designed to experiment with the BC-250 board under various airflow configurations. I wanted a simple design to print  - 2 pieces, and no overhang that would require support.

I ended-up with 2 variants

Model

Fans / Layout

PSU Fan orientation

Best with

Furmark stable freq you can expect (*)

200

1 side‑firing 120x25mm fan (high static pressure)

1 front 80x15mm fan (exhaust)

Intake

Closed fins heatsink

CPU : 3700Mhz

GPU : 1850Mhz

Combined Power ~125W

240

1 side‑firing 120x25mm fan (high static pressure)

1 side‑firing 120x15mm fan

Exhaust

Open fins heatsink

CPU : 3800Mhz

GPU : 2120Mhz

Combined Power ~160W

(*) that's the frequencies I have been able to reach, please note it entirely depends on silicon you have, fan models you choose, the quality of the thermal contact between the APU and the heatsink, and how high you choose to clock your CPU

Handle comes as a bonus. It's not only useful, it also makes the case sturdier (attaches with fan screws).

If your fins are open, definitely choose model 240, it's able to dissipate about 160W under load, and cools down both PSU and VRAM.

Requirements

• Power Supply : Flex ATX PSU (e.g. Metalfish 300W)

• Cooling : 

  • APU fan : 120 x 25mm high-static pressure (e.g. ARCTIC P12 Pro PST)

  • Front fan (model 200) : 80 x 15mm (e.g.: ARCTIC P8 Slim PWM PST)

  • Backplate fan (model 240) : 120 x 15mm (e.g.: ARCTIC P12 Slim PWM PST)

• Front power-button : 21mm ATX power button (see reference image)

Printing guidelines (0.4mm noozle)

• Filament :

  • my prototypes were printed using PETG-GF. I didn't get any satisfying results with PLA for the handle, but your mileage may vary...

  • ~690g filament for the case

  • ~40g filament for the handle

• Slicing Parameters :

  • Auto-position the parts, then rotate 45°

  • No support needed

  • No brim (feel free to use glue)

  • Walls loops : 3

  • Fill-Multiline : 3

• Printing time : ~14h back + ~10h front

Mounting guidelines

• Except for fan screws, use 3.5mm PC screws (the holes are threaded)

• Apply force carefully, PETG isn't very strong and will tear appart if tightened too hard

Mounting the back part

• Install and screw the PSU first with its cables already attached.

  • Note 1 : you can safely remove the PSU's top cover, especially with model 240, as it receives substantial airflow from the side-fan.

  • Note 2 : turn your PSU fan so it intakes with model 200 and exhausts with model 240

• Install side fan(s).

  • Note 1 : on Model 240, both fans should be configured as intake

• Install the BC-250 board on its bracket support (1 screw)

• Plug the PCIe connector into the board

• Connect the fan(s) to the board

Mounting the Front part

• Install the ATX switch. You'll need to remove the connectors first; mark their positions before removal (e.g. 1-M-0). Reconnect the switch after installation to the case.

• Model 200 only : Screw the front 80mm fan to the case, and connect it to the Y cable or the APU fan

  • Note: front fan should exhaust air. You can nonetheless try to configure it to intake, but in such a case, don't forget to reverse your PSU fan as well, so both fans push air in the same direction.

• Connect the ATX switch to the PSU

Final Assembly

• Place the back side upright (BC-250 should remain vertical)

• Pre-position the front part on top:

  • Route excess cables toward the back plate side

  • On Model 240, this operation is a bit trickier, because of air guide on the radiator-side. To avoid pinching the APU fan cable, run it along the radiator.

  • Once the front and back are properly aligned, and cables are neatly packed, finish assembling front and back parts together. Walls should perfectly align. If not, you might have some cables in the way.

  • While still vertical, install the BC-250 board to its front-bracket support (1 screw)

  • Gently tighten top and bottom screws (2+3) to secure the case (again, don't over-tighten!)

• Test that everything powers-up correctly before installing the handle