Thermaltake CA-1R3-00S1WN-00 The Tower 100 Tempered Glass Black Mini-ITX Mini-Tower Desktop Chassis

The design of this case is genius. You get great airflow, and the placement of the bottom fan means often-neglected components like RAM and NVMe drives get direct airflow. It's also clever that the GPU can intake air directly from outside through filtered mesh (however the lack of passive airflow over the GPU means that your fan-stop profile is likely to struggle to keep the GPU cool at idle without waking up the fans). The shape means you get the benefit of a "vertically-mounted" GPU without using a riser cable and without interfering with a tall air-cooler. It's also relatively easy to build as you can remove all panels, and has plenty of room for a full-size ATX and all the accompanying cables, as well as up to a 3-slot tall GPU.

The build quality is a bit weak - the metal feels a bit thin and flimsy, especially the top cover, which has quite a lot of bulge and flex. The price is just a little too high to justify this. Additionally, while the first build is easy, it's tricky to make subsequent changes to the build, as you have to undo 5 screws to remove the top panel, which has to come off in order to remove the tempered glass panels (although it works OK if you just don't re-do those screws).

Overall, despite these flaws, it's an easy recommendation for someone wanting to put full-size components in a smaller-footprint ITX build while retaining good airflow.

I got a 5800x cooled by a D-Cooling SE-207-XT Advanced and an Rx5700xt with 2 140mm fans and this case just eats it all with no issue

The great airflow design is amazing since my pc never goes past 50C while working

I chose this case because I wanted to do a small form factor build but all the ITX cases had limited options for cooling / ventilation and I don't do liquid or AIO cooling... This case fits an ITX but can do 165m high air cooler and can do a three fan GPU, plus it comes apart really well so you have great access and lots of space for cable management, it even takes a 165mm deep ATX PSU !!! I have three RGB 140mm case fans in addition to the CPU cooler in a vertical chimney effect... I love it and it looks great on my desk...