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Fractal Design Define S ASUS ROG Gaming PC Case Mod

Level 12

Fractal Design's Define S chassis allows you to mount three 120mm or two 140mm cooling fans directly behind the bezel. This feature allows more interior space for larger radiators or push-pull fan configurations. The bezel's ventilated sides provide sufficient airflow for the factory default fan locations configurations. Opening the front of the bezel will improve airflow even more.

This Fractal Design Define S PC build is for Farctal Design's event at 2015 Computex. The Define S Mid Tower Case is aimed at DIY liquid cooled PC enthusiasts looking for optimal space and value for their money. The Mod Zoo Staffers, Mosquito and Captain Curry Sauce give us a tour of the Define S and it’s variety of options for liquid loop layouts. $79.99 Retail for Non-Window version. $89.99 Retail for Window version,
Mnpctech is modifying the Define S from the video review for Fractal Design's Party Event at 2015 Computex. Mnpctech will be installing a custom liquid cooled gaming system for Fractal Design to give away after their event. All of the stages of this project will be documented on this webpage, so Bookmark it and check back often for updates! We're starting out with a Do-It-Yourself guide to modifying Fractal-Design Define S case bezel for additional airflow

Supplies & Tools Needed for this Case Mod:

1. 3M Scotch 233+ Green Professional Masking Tape,

2. 12" Measuring Square and Pen or Pencil

3. Dremel or Rotary Tool with Reinforced Cutting Wheels,

4. Jigsaw with 18 TPI or higher Bi-Metal cutting blade

5. Hand File

6. Medium Grit Sandpaper or 3M Red Scotchbrite pads,

7. One sheet of Mnpctech 24" x 12" Round Modder's Mesh Sheet,

8. 3M ScotchWeld DP-190 Two Part Epoxy with Applicator Tip

9. Wire Clip or Tin Snip (Optional)

10. PETG Tube for PC Liquid Cooling. $.99 per 12" long tube, 1/2" OD x 3/8" ID PETG clear tube for Custom PC liquid cooling loops offers the same clear quality as standard Acrylic with an excellent impact strength and easy bend-ability.

PETG Clear Tube works with these 1/2" hard line compression fittings that include,
Alphacool HT 13mm OD hard tube
Monsoon Free Center Hardline Fitting - 3/8" ID x 1/2" OD
Monsoon Chain Gun Hardline Fitting - 3/8" ID x 1/2" OD
Primochill Ghost Hardline Fitting - 3/8" ID x 1/2" OD
Primochill Revolver Hardline Fitting - 3/8" ID x 1/2" OD

The Define S bezel is factory molded from ABS plastic, which is very durable and resilient to cracking. Removing a majority of the face plate didn't effect overall rigidity.

The backside of the bezel shows it's simplicity in design.

The first step is to cover the bezel with 3M Scotch 233+ Masking tape. This allows you to write measurements onto the bezel and protects it from being scratched by the Jigsaw.

Measure and mark off the portion of material you wish to remove. This cut-out will have 1" bordered frame of material remaining. Put on your Safety Glasses and use Rotary Tool with cutting wheel to make incision cuts in each corner. This will allow you to use a Jigsaw to make the long straight cuts efficiently.

Use Jigsaw with 18 TPI or higher Bi-Metal cutting blade to make the long cuts as straight as possible.

After finishing all of the cuts with the jigsaw, use a hand file and medium grit sand paper to clean and fix all of the edges.

Inspecting progress before moving onto the next stage.


These are two of the multiple mounting pegs on the backside of the bezel. We've chosen to remove the inner facing base support of each peg with a Wire cutter, so the mesh can be cut as rectangular piece. This step isn't required if you cut the Modder's Mesh sheet to fit around each mounting peg.

Use medium sand paper to smooth over the surface after cutting the one side of each peg base.

The Define S bezel's new intake grill will be cut from a 24" x 12" sheet,

This material is 22 gauge perforated plain steel. 5/32" holes 3/16" staggered centers. 33 holes per square inch.

It's great for creating custom fan guards, grills, and cooling vents like this. It does need to be painted or clear coated otherwise it is a bare steel and will oxidize over time.

The mesh grill will be attached with 3M Scotch Weld DP-190 two part epoxy with mixture applicator attachment.

Place bezel on it's face. Apply the epoxy with it's applicator over the mesh overlapping the back of the bezel. It will ooze and sink into the individual holes of the mesh.

Use c-clamps or spring loaded clamps to hold the mesh in position as it cures for 24 hours.

Place some heavy objects on the mesh. This will prevent the mesh from bowing or warping as the DP-190 epoxy during it's 24 hour cure time.

The bezel will be ready to handle 24 hours after the epoxied mesh has cured.

Level 12
I posted a description of the dual 360 loop with PETG tubing,

Level 13
WOW Nice , U Got Talent ...
Could I have mine in Laborghini Orange Please {Arantic Borealis}

Level 7
Amazing piece! How long did it takes for you to finish it?

Level 12
Thank you, I had roughly 3 weeks, I've posted all of the steps in the modifications here,

Here are the final specs

1x Fractal Design Tesla Power Supply 800W
6x Fractal Design HP-120 cooling fans
2x Hardware labs 360 GTS radiators (1x top, 1x front)
1x Laing water pump with Alphacool top
1x Silverstone PWM fan hub
1x 24 pin individually sleeved
2x 8 pin individually sleeved
2x 12” Darkside white LED strip
1x XSPC 240 Photon Res
2x EK 970 GTX Strix Waterblock
2x EK 970 GTX Strix Waterblock Backing Plate
1x EK MX CPU Waterblock
11x Monsoon Economy Hardline Fitting, Blue
7x EK extender fitting
9x EK 90 degree fitting
1x ASUS ROG Maximus VII HERO ATX Motherboard
2x ASUS STRIX 970 GTX Video Card
4x Corsair Dominator Blue DDR3 (16GB)
2x Intel 520 SSD, 120GB
1x Mnpctech 360 “slotted” rad grill
Mnpctech PETG 1/2" OD Hrad line liquid tubing

Final photos of my "Define S" PC taken by Fractal Design's Office in Taiwan