Welcome to the new online manual.

EVOLUTION is a trio of fully 3D printable PC cases with advanced customizations. We're exploring the future of PC cases as digital downloads.

Any questions, just email me at support@modcase.com.au

Haydn Bao

Table of Contents


The Files provided by the MODCASE EVOLUTION (EVO) and its CAD assembly are for experienced PC builders, as they are intended to be used with the user's own printer, computer parts, screws and cables. MODCASE EVO is committed to ongoing development, with recommendations for maximizing print strength and reliability included for best results. However, it is the user's responsibility to source parts and cables from reputable suppliers and to observe their new PC after building, running some real-world stress tests, and ensuring that the parts are not brittle or easily delaminated. Additionally, the quality of the printed case may be affected by the filament, printer model, settings and any modifications made via CAD.

Detailed terms of use are outlined in our End User License Agreement (EULA) included with the files. By using MODCASE files, you understand and agree that Haiteng Pty Ltd, the owner of MODCASE, is not responsible for any loss or damage that may result from the use of the print files.  Otherwise, please do not use the files, contact support.



Join the frame halves using 4 screws from the inside. 

MODCASE EVO Assembly Guide



The M-ATX model comes in 4 splits to fit your print bed, they join using screws as shown below.

M-ATX uses a screw-less GPU retainer.

Modcase EVO mATX assembly instructions


4-Split side panels are in Optional/Side Panels folder for smaller than 200x200mm beds.



The APU frame is quite compact, it essentially slides on and assembles 'around' the electronics. To slide in the motherboard, please remove these 4 screws:

1. All USB cables are secured with normal PC case screws.
2. Attach ATX and IO cables before sliding the motherboard in.



Insert retainer clips before installing panels.


Small Parts


Vertical Base *New*

This mod lets you use your EVO vertically for a minimal foot print. 

You can optionally mount a USB hub up to 154mm long (e.g. this hub works well with a USB extension cable).

Shorter hubs are preferred for ITX. (e.g. this hub).

Vertical Base Tips:
1. You may not need to reprint your frames for this base! The self tapping wood screws can drive directly into the existing rear. 4 positioning studs are included on the top of the base for easy alignment.

2. If you do reprint, new holes were added to the latest "Frame_RT, Frame_RB, Frame_R" files to receive this base. The extra holes are hidden behind 0.3mm of material for a clean appearance for those who don't need the holes.

3. Need more bottom cable clearance? Scale "Base Feet x4" in the vertical direction only in your slicer (untick uniform scaling). This will result in taller feet, it's designed to work even after scaling.

4. Feel free to try other rectangular hubs, you may just need to adjust your mounting tape thickness for a centered fit. Use CAD files for further customization.


Part List

EVO APU Description
Frame_T Top half of mainframe
Frame_B Bottom half of mainframe
Clips Clips for retaining side panels
Side Side panel

Removable mesh for PSU.
Clicks in place from outside.

Base Removable vertical base
Hat Experimental glue on decorative panel.


EVO ITX Description
Frame_F Front half of mainframe
Frame_R Rear half of mainframe
Clips Clips for retaining side panels
Door_B Bottom access door
Door_R Back of motherboard access door
Side_R Rear half of side panel
Side_F Front half of side panel
GPU_R GPU retainer plate and thumbscrews
Feet 14mm case feet, best printed in TPU
Caddy Adds 2 x 3.5" or 4 x 2.5" drive support
Rad_S240 Side mounts 240mm radiators
Fan_S120 Side mounts 120mm fan or rad
Fan_T120 Top mounted 120mm fans
Door_R Style2
MESH (Door_R Style2

Vent Style Rear of Motherboard Door.

Side_F Style2
Side_R Style2
MESH (Side_F Style2)
MESH (Side_R Style2)

Vent Style Side Panels.

2 - Split 212mm longest dimension

Mesh is a separate removable piece


EVO M-ATX Description
Frame_FB Front-Bottom of Main Frame
Frame_FT Front-Top of Main Frame
Frame_RB Rear-Bottom of Main Frame
Frame_RT Rear-Top of Main Frame
Clips Clips for retaining side panels
Door_B Bottom access door
Door_R Back of motherboard access door
Feet 14mm Case feet, best printed in TPU
GPU_R GPU Retainer (NEW tool-less design)
SFX PSU Bracket SFX PSU bracket can mount to the side or the front.
Side_F Mesh Side Panel Front half
Side_R Mesh Side Panel Rear half
Side Single Body mesh side panel (247x344x6mm)
Mesh Side panels. 4 Split (193mm longest dimension)
Side_FB Style2
Side_FT Style2
Side_RB Style2
Side_RT Style2
Vented Side panels. 4 Split (193mm longest dimension)
Side_F Style2
Side_R Style2
MESH (Side_F Style2)
MESH (Side_R Style2)
Vented Side panels. 2 Split (245mm longest dimension)
The mesh is a separate removable piece
Side_FB Style2
Side_FT Style2
Side_RB Style2
Side_RT Style2
MESH (Side_FB Style2)
MESH (Side_FT Style2)
MESH (Side_RB Style2)
MESH (Side_RT Style2)
Vented Side panels. 4 Split (193mm longest dimension)
The mesh is a separate removable piece
MESH (Front PSU) Mesh for front mounted PSU intake
Filter_120 Rear 120mm Fan mesh
Filter_FT Front-Top internal mesh
Filter_RT Rear-Top internal mesh
Filter_S Side internal mesh and Door_R Style2 mesh
Door_R Style2 Vent Style Rear of Motherboard Door. Uses Filter_S
ATX PSU Brackets Up to 225mm long ATX PSU support
Caddy Mounts up to 6x2.5" and 3x3.5" drives
USB-C Holder Mounts USB-C in V1.2 and earlier



Filament: PETG recommended. Do not use PLA. (Read more)
1 - 2kg is required. You can find PETG for $13/kg (Link) or $10/kg for 10 (Link). These are examples, it doesn't have to be these brands.

PLA will warp over time with heat.

Engineering materials such as PC, PA, PC-CF, ASA and ABS should be reserved for experienced printers.
Hardware Link
Power Button Ø16mm
Power Cable Right Angle
Screws M3x20 Self tapping (30 pcs)

The EVO can use most commonly available M3x20 screws. The imperial equivalent #4x3/4 screws also work.

Optional Link
Reset Button Ø16mm
USB Type C 40cm
USB Type A 30cm


USB-C Port

Modcase is designed to use most commonly available components. This USB C cable is suitable for EVO M-ATX. Similar cables may also work.

Make sure to cut the rubber tabs (it's soft) and use standard computer screws (#6-32 -6) to secure the cable.

Note: EVO v1.3 onwards no longer requires the separate retainer for USB-C.

USB Type A  - Also need to trim the rubber tabs before use.

Standard PC screws are used for PC components such as Motherboard and PSU. (#6-32*6)



Printer Requirements

  1. Nozzle Temperature: 240°C 
  2. Bed Temperature: 90°C 
  3. Minimum Bed Size: APU 180x180mm  |  ITX 240x170mm  |  m-ATX 200x200mm

Any printer meeting the above specs will work.
E.g: Bambulab A1, P1p, P1S, X1C, X1, Prusa Mk3s+, Mk4, Sovol SV01 Pro.

ITX comes in 2 splits, m-ATX has the new 4 split assembly.

Like games and GPUs, higher end printers will render nicer looking prints. Older printers can get a good result, but may require more Troubleshooting to get started. 

Slicing guide - Main Frame

Tip: Download latest files before printing.
- EVO has quality and feature updates!
- Download updated files via the original link in your email. Your unique link has the newest version at all times.
- You will also receive this link via email when updates release.
- Updated files are backwards compatible.

    1. Load “Frame_R” in your slicer and select the following settings:

    For PETG 0.4mm Nozzle

    Layer Height


    Print Cooling Fan

    27% (Min and Max)


    20% Grid





    Nozzle Temp


    Bed temp

    90°C (Important)

    Infill/Perimeter overlap


    Bed temp must be 90°C for proper PETG bed adhesion. Use a 'brim' or glue on the print plate if you're still having lifting prints.

    2. Slice and Print!

    Evo Rear Sliced and Ready to Print

    Note on Stringing:
    Please dry the filament before printing. Otherwise, tuning print settings may not help.

    See Troubleshooting section for drying tips.

    Slicing Guide - Mesh Panels

     1. Load “Door_R” in your slicer and select yes when prompted to “load as single object with multiple parts”.

    Evo slicing guide rear door

    Parts with mesh have 2 BODIES, one dedicated for mesh, one for solids.

    2. Enter the following print settings

    For PETG 0.4mm Nozzle

    Layer Height


    Print Cooling Fan

    25% min, 50% max


    36% Grid



    Supports No

    Nozzle Temp


    Bed temp


    Infill/Perimeter overlap



    3. Right click the mesh body in the objects panel > Select “infill” and “Layers and Perimeters”

    Infill Perimeter Select Both

    Tip: In Bambu Slicer, you can select the mesh via the objects tab.


    4. Set the mesh to: 36% Grid infill, 0 perimeter, 0 top and 0 bottom layers.

    Evo Mesh Slicing Density settings

    This dedicated body uses native slicer infill geometry to generate fast, clean and strong meshes. Make sure to reduce infill speed if you see broken mesh.


    5. Slice and print!

    Modcase Evo mesh sliced and ready to print

    Repeat the same procedure for the other panels.

    Note on Supports:
    Modeled supports are included for critical overhangs. For best print success, do not turn on additional supports. 

    Optional mesh customizations

    The mesh can be customized without CAD. Simply set your own density and infill type when printing.

    E.g. Use triangular infill with 30% density. This means the mesh will be weaved as triangles and with an open rate of 70%.


    NOTE: Watch out for elephants’ foot, as it can restrict airflow. Elephants foot can be controlled via first layer flow adjustment (Cura) or via the Elephants foot compensation setting in others.

    Slicing guide - Small Parts

    Print Solid for the rest of the small parts: such as the Fan and PSU brackets, HDD Caddy, Feet and Clips.
    For PETG 0.4mm Nozzle

    Layer Height


    Print Cooling Fan

    27% (Min and Max)


    100% Rectilinear





    Nozzle Temp


    Bed temp

    90°C (Important)

    Infill/Perimeter overlap


    1. The GPU Retainer has an optional mesh body. You can assign mesh parameters like the side panels above to have a breathable mesh window, or you can just leave it solid.
    2. The Feet is best printed in TPU. Please follow TPU settings according to your filament.


    Optional Parts

    Removable Filters

    Intakes such as the top and side panels have removable fine mesh for dust filtering. For example, the ITX model has the following filters:

    The exhausts are relatively open for unobstructed heat dissipation. The PC should be set up with positive air pressure.

    The Part List has a full list of filters available.

    Cable management strap points

    Up to 12mm wide cable management straps or zip ties can be fitted to the following 3 positions.

    Metal Nut Inserts

    M3 locknuts can be inserted into dedicated pockets behind most holes, to be used with M3 machine screws.

    Please consider this as a backup option only. The self tapping screws have a lot of thread engagement and are quite reliable.


    Drive Caddy

    EVO M-ATX : Up to to 3 x 3.5", 6 x 2.5" drives
    EVO ITX : Up to to 2 x 3.5", 4 x 2.5" drives

    EVO M-ATX PSU options

    Mount the PSU to the bracket first, using normal PC case screws. Then the bracket to the case with M3x20.

    SFX and SFX-L can mount to the side or the front. Mesh filter is available in the 'optional' folder.

    ATX PSU up to 220mm long can be front mounted with the 2 piece bracket.

    - SFX PSUs are recommended for full GPU length support. If the ATX PSU is longer than 140mm, the max GPU length is 254mm. Even then, some 140mm modular ATX PSUs have cable exits that reduce GPU length support.

    - SFX PSUs are also required for side mounted 240/280mm radiators.


    Fans and Radiators

    Radiator Support Fans Support
    MATX 2x 280mm (Side, Top) 4x 140mm (Side, Top), 1x 120mm (Rear)
    ITX 1x 240mm (Side) 4x 120mm (Side, Top), 1x 92mm (Rear)

    Note: A slim 140mm fan may be needed to fit 280mm radiators on the side when using MATX motherboards.


    280mm Radiators and 140mm Fans are mounted on the side with optional mounts as shown below:

    When mounting just 2 fans on the side, please use a "bridge" in the middle. They're included in the radiator mount files. See below.

    Reset Button

    A 16mm hole is available at the back for an additional reset button. Just push out the cover piece and install the same type of switch as your power button.


    Scalable Feet

    Stock height is 14mm. You can scale it via your slicer in the Z direction. Untick the uniform scaling box and type in the height you like.

    Going lower than stock is not recommended. If you're lowering the feet height, be careful and make sure your screw doesn't reach internal components.


    Alternative Side Panel

    Side panels that simulate the looks of the vents are also included in your optional folder. The default mesh type panels (left) have greater airflow for the same mesh density.

    MODCASE EVO Mesh VS Vented Side Panels


    Carbon Fiber reinforcement

    Four Ø6mm x 300mm Carbon Rods (Link) can be inserted to reinforce the case. See diagram below.

    This is optional. Any Ø6mm rod will work.



    EVO mATX - 18.3L 1.5kg
    Size 352 x 272 x 191mm
    GPU Support 4.75 Slots - 340x165x96mm
    Motherboard mATX, ITX, DTX
    CPU Cooler Up to 158mm tall
    Hard Drives 6x2.5", 3x3.5"
    IO Ports USB-C, USB-A x2
    PSU SFX, SFX-L, ATX up to 220mm
    Radiators up to Dual 280mm!
    Fans  4x 140mm or 5x 120mm
    EVO ITX - 11.9L 1.1kg
    Size 320 x 225 x 166mm
    GPU Support 2.5 Slots - 305x140x51mm
    Mother Board ITX
    CPU Cooler Up to 135mm tall cooler
    Hard Drives 4x2.5", 2x3.5"
    IO Ports USB-C, USB-A x2
    Radiators 240mm
    PSU 4x 120mm, 1x 92mm
    EVO APU - 3.7L 0.5kg
    Size 305 x 179 x 68mm
    Motherboard ITX
    CPU Cooler Up to 49mm tall cooler
    IO Ports USB-C, USB-A x2

    *Weight can vary due to customizations.

    Versions: What's Included

    EVO mATX Print File   ✓    ✓
    EVO ITX Print File   ✓    ✓
    EVO APU Print File   ✓    ✓
    Optional parts   ✓    ✓
    EVO mATX - CAD Library    ✓
    EVO ITX - CAD Library    ✓
    EVO APU - CAD Library    ✓
    Optional parts - CAD Library    ✓


    Efficiency is at the heart of Evolution's CAD library. The simplicity of the drawing means you'll find clean forms and features that can be adjusted either by dragging or entering numbers.

    This CAD file is created from the ground up and delivered in the universally compatible STEP format. There are no hollow bodies or inoperable surfaces. Just clean, fully detailed and functionally interactive 3D models - that is ready to print. 

    It's a complete CAD assembly with all the optional parts as well. It's continuously updated and always accessible via your unique download link.

     Recommended CAD Program: Autodesk Fusion 360 (free)

    Opening the File
    File > Upload > Select Files > Choose file > Upload.

    Enable Direct Editing
    Right-click top component in Browser Tree on the left > click "Do not capture Design History".

    Right-click a body> Save as mesh > Choose "3MF" > tweak refinement (optional)> Save.

    It's recommended to export as 3mf instead of STEP for printing for resolution controls and generally better slicer compatibility.

    Examples of CAD Customization

    Adjust Chamfer

    The same tool can be used to change the angle of the chamfer.

    Add Fillets


    Delete Features

    The same applies to holes and other geometry. The trick is to select all faces to do with the features you're deleting.

    Edit Holes

    Pattern Vents

    Resize Case

    Modcase EVO CAD - Extend Case

    Add and Subtract bodies

    Modcase EVO CAD - Add subtract guide

    Here's a reference on CAD skill levels involved editing various actions.

    Easy Edits:

    • Fillets - Add/Remove/Resize
    • Chamfers - Add/Remove/Resize/Adjust Angle
    • Holes - Add/Remove/Resize/
    • Vents - Remove/Pattern
    • Mesh - Adjust pattern and Density
    • Feet - Resize/Adjust angle
    • Combine/Subtract Operations (Boolean)

    Advanced Edits:

    • Alter/Move large structures
    • Move Walls, Adjust Thickness
    • Custom Front IO
    • Custom Water Cooling Mods
    • Create RGB Lighting Accessories
    • Create new mounts and accessories
    • Create molds
    • Create new vents
    • Add more PCIE slots
    • Resize case
    • Split Bodies

    Proceed with caution. Please understand, by altering the CAD you're changing the structure of the case itself. Ensure at least a 4 to 1 safety factor when designing your structures.

    To expose issues and speed up testing, you may want to consider test prints with only 2 walls, 2 top and bottom layers. This will reduce printing time and create an intentionally weaker print to expose any structural issues.



    Remix Policy

    Personal Use
    You're welcome to remix and modify all parts for your own use.

    Commercial Use
    This model is sold for individual use only. If you want to sell finished prints please contact hbao@modcase.com.au

    Community Use
    With the exception of the Mainframe* files, you can share your mods and remixes for free amongst others with attribution.

    *Mainframe files:
    Frame_FB, Frame_FT, Frame_RT
    Frame_RB, Frame_F, Frame_R
    Frame_T, Frame_B

    Distribution of mainframe files for profit or for free is not permitted
    , whether original or modified. If you wish to collaborate or monetize MODCASE designs, please contact hbao@modcase.com.au 

    We trust these guidelines inspire creativity within our community while preserving the design's integrity. Thank you for your understanding and cooperation.



    How to print stronger
    1. Dry your filaments prior to print.
    2. Print at the upper material temperature limit.
    3. Reduce print cooling.
    4. Higher mesh density.
    How to print for better appearance

    The following is an oversimplified list of factors that usually produce nicer looking prints, some affect strength.

    1. Use a lighter filament color or one with matte finish.
    2. Print at colder nozzle temps.
    3. Slower external perimeter speed
    4. More print cooling.
    5. Faster travel speed.
    6. Try Arachne perimeter generator.
    7. Service the printer (lube, loose screws, belts, defects)
    8. FDM prints look better in a soft lighting environment in general.
    1. Dry your filament. Otherwise tuning settings won't help.
    2. Check your retractions. Bowden ~2.5mm. Direct Extruder ~0.8mm (Varies with printer, normally it should be settings from your manufacturer.)
    3. Set Z-hop to 0 or 0.1mm (Lift Z)
    How to dry filaments

    - Using your oven. Set to 60°C and put your filament roll in it for 24 hrs.

    - Using your 3D printer. Set your print bed to 70°C, put the roll of filament on the bed and cover it with a box. The box doesn't need to be airtight, so the moisture can escape. Leave it there for 24 hrs.

    - Using a good filament dryer like the Eibos dryer, or one that can go up to 55°C.

    Ghosting (Rippling Edges)
    Ghosting can be helped by slowing down external perimeter travel speed. You may also want to reduce acceleration and jerk values, specifically for the external perimeter if your slicer has the granular setting.

    Alternatively, just reduce printing speed globally. 
    Print with 0.6mm nozzles

    All print settings are the same as 0.4mm except infill% for the mesh. You’ll need to increase density - a 40% mesh for 0.4mm nozzle is similar in hole size as a 50% mesh printed with 0.6mm nozzle.

    It is best to print the side panel retainer clips with 0.4mm nozzle.

    Post Processing (cleanup)

    Some overhang will occur in these 2 areas of your print. These are factored for in testing; they're internal and do not affect function. You do not need to tune your printer for these areas.

    Allowed Over HangsYou may need to trim some small bits of plastic sticking out, there's no need to reprint. For the most part, overhanging features have been mitigated with angled geometry.

    For example, the side vents start their lowest end on the inside, leaving the visible side perfect as it is the top of the vent strut.

    Material Saving

    If you are confident of your layer adhesion, you can step down to 3 perimeters to save on some material on the smaller models.

    4 wall is recommended.

    Broken Clip

    If you're having issues, try the following:

    1. Press P to access 'paint seam' feature in PrusaSlicer or Bambulab Slicer.

    2. Paint seams on the back of the thickened middle area. 

    This ensures the thin features of the clips are free from any seams that may weaken it.

    Broken Mesh

    Option 1. Set sparse infill line width to 0.5mm

    Bambulab: Quality>Line width>Sparse infill>0.5
    Prusaslicer: Print settings>Advanced>Extrusion Width>Infill:0.5

    The above is for 0.4mm nozzles. For fixing broken mesh on 0.6mm nozzles, set it to 0.7mm.

    Option 2. You can reduce sparse infill speed by 30%.

    Prints lifting or curling corners

    For PETG – Clean your bed with alcohol and ensure bed temp is 90°C.
    For PA, PC, ASA, PC-CF - try glue stick, use a actively heated print enclosure and 110°C bed temp.

    Cracking, brittle or delaminating prints
    1. Dry your filament again. The surface area of a spool of filament is immense. In open air, it can absorb enough moisture in 1-2 days to cause noticeable stringing, uneven walls, and bad layer adhesion.
    2. Increase nozzle temp. Normally nozzle temp shouldn't exceed 250°C,
    3. ASA, ABS, PC and Nylon really should be printed using an actively heated enclosure. Otherwise, you may end up with a print that is prone to cracking.
    Supports hard to remove

    If using Slic3r based slicers (including PrusaSlicer), set support "style" to Snug, and "XY separation between an object and its support" setting to 100%.

    Restrictive mesh

    Your first layers might be squished and flare out, making the holes smaller.

    To fix: reduce first layer flow in Cura, or in PrusaSlicer increase elephants foot compensation parameter.

    For expert printers: you can individually control the first 4 layers by using the following custom GCODE before layer change.

    {if layer_num==0}M221 S92{endif}
    {if layer_num==1}M221 S98{endif}
    {if layer_num==2}M221 S99{endif}
    {if layer_num==3}M221 S100{endif}

    S Value = flow percentage. You many try your own S values too. Each line of this code instructs flow % for that layer. By having full control of the first few layers, you can eliminate elephant’s foot, and even shape a tapered leading edge.

    Custom leading Edge Gcode


    Share your experience!

    EVO is now on Printables (link), please share your make, let us know how you liked your MODCASE. If you need any help with your build just email support@modcase.com.au

    Your experience helps others find and improve the EVO. It's digital product with instantly deliverable updates after all!

    MODCASE Evolution improvement

    All attempts have been made to provide an informative and helpful guide. However, if you spot any issues or discrepancies please contact support. This manual and EVO will continue to improve over time.

    If you have any further issues, do not hesitate to send in your query image and description to: support@modcase.com.au

    Update Log:

    You can download the latest files via:

    1. The original link in your purchase email confirmation.
    2. The link in your update notification email. It's the same URL.

    Your unique download link contains the latest files at all times. Updated files are backwards compatible.

    1 Mar 2024
     - MODCASE EVO 1.4
    Vertical EVOLUTION as arrived!

    - New bolt-on Vertical Base mod added
    - Optional USB hub mount for vertical base
    - Optional mATX frame without USB-C
    - CAD updates (new base and frame_Ft models added, dissolved duplicated features, grouped components and general cleanup)

    29 Nov 2023
     - MODCASE EVO 1.3

    *NEW* Evolution 3.7L APU model added!

    - New min 180*180mm Bed size support for APU.
    - ITX updated side vent and PSU mount print quality. (Frame_F)
    - ITX added USB-C front IO
    - MATX now has new direct mount USB-C (Frame_FT)
    3 Nov 2023
     - MODCASE EVO 1.21
    - Evolution MATX Side_RT print file fixed.
    16 Oct 2023 
    - MODCASE EVO 1.2
    *NEW* Evolution mATX model
    - Dual 280mm Radiator support
    - USB-C support
    - ATX PSU support
    - mATX motherboard support
    - 6x 2.5" or 3x 3.5" drives support
    - Tool-less GPU retainer
    - More removable internal mesh options
    - More bed size compatibility, min 200*200mm.
    26 Sep 2023 
    - MODCASE EVO 1.1
    - Frame_R Reset hole fixed oversize.
    - CAD Assembly cleanup.