This is a case mod for the Lenovo Thinkcentre m720q/m920q/m920x/p330.
Its purpose is to fit a dedicated GPU inside while keeping good airflow and thus good cooling capabilities. (low profile single slot gpus only, with a max TDP of 50W)

One design goal was to make it printable in one part - however i might redesign it in the future and improve on this design.

There will be a YouTube video in a few weeks (so probably somewhere around 11/2024) to explain how to build the PC and what to wath out for.

PRINTING:
Two versions of the top case are available for the two different versions of the rx6400 (slightly different fan positioning).
preferrably print with PETG (however if you are using the Sapphire version of the rx6400 you may also use PLA as this GPU runs much cooler than its XFX cousin).
The hardest part will be removing the supports without breaking anything (depending on the print quality).

THINGS NEEDED:
8x M3 screws (or less if you can reuse flathead screws that might come with your case mounting the additional ports):

• 4 for mounting the case, 1 for mounting the GPU bracket on the backside of the case and 2 for mounting it on the GPU itself, 1 flat head screw for mounting the GPU adapter to the case (optional)

2x M3 nuts for mounting the GPU bracket on the GPU

1x M3 heat insert (optional - for the screw on the side of the GPU bracket)

GPU adapter as can be found here:
https://amzn.eu/d/3vZtN8A
135w power supply (if you only have a 65W one):
https://amzn.eu/d/iH1uq86

Wifi antenna set, as you will have to remove the "internal front antenna" in order to fit the gpu. Make sure to buy the right form factor connectors, in my case the wifi card that came with the pc needed MHF4 connectors (had to learn that the hard way and bought the wrong ones first).
Then one antenna goes in the standard antenna hole on the backside and the other one into the hole in the GPU bracket.
The one that fit my wifi card:
https://amzn.eu/d/1ukf5EF

You will also need matching screwdrivers (a soldering iron for the heat insert - optional) and fine-tip pliers as well as a box cutter come in handy for cleaning the prints.

ASSEMBLY:

Print the GPU bracket and optionally put in the heat insert on the side, remove the GPU cover and mount the GPU bracket using 2 M3 screws and nuts at the bottom as well as the small GPU shield screws above the ports.
Attach the GPU adapter to the GPU. Take out the Sata drive cage (if present), the "internal front wifi antenna" if your GPU doesn't fit and any modular I/O-ports if present.
If you want to use the pc with a new wifi set, put the antennas in place in the bracket before inserting the gpu assembly.
Put in the GPU with the adapter attached (optionally put in a flathead screw to secure the adapter).
After printing the top case, you will have to break off one of the metal lashes on the right side of the main pc housing for one of the screw holes. you can easily check which lash you need to remove by placing the top cover onto the lower case and checking the screw holes for obstacles.
Then put in the screws in the side and in the back.
You're good to go :)

Additionally i designed a stand to place the PC upright - see files.

Please let me know if you have any ideas for improvements or how you like the design.
Have a good one!