GMKTec K12 Case

Please note that I am not a professional designer; this is a hobby project. You do everything at your own risk.

Commercial use, selling prints or files on Etsy/eBay/etc. is NOT allowed without my written permission.

You will have to solder small cables to the motherboard—think about whether you can do it!

The design uses a 92mm fan and has the option of adding a Noctua NA-FC1 PWM controller

*About fans:
- it is safest to use the original 92mm fan. It is not that bad and does not require any modifications.
- if you want to use a different 92mm you will need to modify the wiring - I will not provide specific instructions - I will only say that the board provides 5V and easily powers some 12V fans (it is then quiet and efficient). Only 15mm thick fans will fit.
- unfortunately, there is no space for 120mm fans.

About Noctua NA-FC1 PWM controller:
Noctua NA-FC1 solves all problems with CPU fan.

Problem one – setting a fixed value (20%, 40%, etc.) resulted in either quiet and hot or loud and OK temp. Solution: Noctua allows you to set the RPM freely using a knob (after setting it to 100% in BIOS).

Problem two – automatic mode – the fan stops completely and then starts up again, causing noise.
Solution: Noctua has a mode in which the RPM never drops below a certain level.

For installation Noctua you need to have knowledge about this, use additional adapters, etc. But it's worth it!

The design is intended to be placed in a vertical position, but it can also be laid on its side.

List of items to print and settings:

• case.3mf
  the most important file. It is recommended to use supports in key areas, as shown in the photo. For a better appearance, also set the seams on the wall that will not be visible.
  

  

• front.3mf / top.3mf
  top solid layers: 0, bottom solid layers: 0, infill: Rectilinear 25% (or more)
  

• back.3mf / back_wo_noctua.3mf
  top solid layers: 0, bottom solid layers: 0, infill: Rectilinear 25% (or more)
  You can add Generic-Box as shown below and modify infill to 15-20%
  I printed this part with PLA, but if you have concerns, print it with a different material (ABS, ASA, PETG)
  

  

• 2x leg.3mf
  supports: on
  

• noctua_holder.3mf / fan.3mf
  without special settings, print normally

Tips and tricks

• When inserting the PCB into the housing, start with the front (hook it in) and then lower the back. Always center the board so that it fits evenly. Some elements at the back may break off slightly - this can happen and does not interfere with anything.
  

• Use M3 18 mm spacer screws to screw the PCB in place. You can use slightly shorter ones. Place the fan.3mf on them and screw it in place with regular M3 screws or more spacer screws.
  

• The front.3mf is prepared for magnets (4x6) to be inserted, but this is optional because everything should fit in place without them.
  

• You will have to reattach the WiFi and BT antennas
  

• The most difficult part is soldering the new wiring to the new power-on switch:
  Remember to check the connection with a multimeter (it should show a reading when you press the button). If you are not confident, do not solder! Wait until someone remixes the project to use the existing power switch.
  

  

  
  

Bill of Materials (BOM)

• several M3 screws

• 16MM Metal Flat Head Momentary ON OFF Push Button Switch
  

  

• 3x spacer bolt / screws M3 18mm
  

  

Good luck!
And let me remind you once again that if you are not confident in your abilities, just don't do it. This is a difficult project and requires some experience in the field.

If you like my work, you can support me.