Four (4) Layer Stackable Acrylic Raspberry Pi 3 Case for Model B B+ and Pi 4 Enclosure with Fan and Heatsinks - Clear (RAS-PCS46)

My original item had 8 acrylic top pieces instead of 4 tops and 4 bottoms, and unfortunately I had waited 3 months to open it so I could not exchange it via Amazon. I contacted Micro Connectors customer support and they immediately shipped out a brand new one, which I received two days later, and which was perfect (and even had newer Raspberry Pi 4 heatsinks included).The case was easy to set up, building layer by layer, and the included fans directly connect to the Pi's +5V and GND connections. The spacers and screws are all good quality and fit together perfectly. The acrylic has paper or plastic protectors to prevent their becoming scratched in transit.Unfortunately, because I am using LoverPi PoE (Power over Ethernet) Hats for my Pis, the fans in their suggested configurations (hanging under the top pieces) do not fit. I instead installed the fans above the tops, which was possible since there are separate top and bottom pieces separated by enough space to fit the fans with airflow. This would not be possible in most other 4-Pi acrylic cases, since they use only one piece for the top and bottom in the middle layers. I also had to use a pull configuration for the fans rather than push, since the fans are so thin that they were rubbing against the acrylic in the push configuration. You could probably get it to work in a push setup with some spacers on the fans.Even with this less than ideal fan setup, my Pi 4s only reach about 70C running cpuburn, so no throttling occurs, and there are no issues with the PoE hats overheating. The top Pi runs significantly cooler (10C+ less) because the fan airflow is unrestricted.You can see my final setup picture, connected to a TP-Link PoE switch. The case looks great and is very functional.

This worked great for some MMDVM hotspots I put together.

good rack for multiple pi

Amazon delivered this product late.

I waited all day at the door. The moment the package arrived, I ran upstairs to my room and opened the box. Woah! Four fans!! For $30, the four pack is a wayyy better deal than the single pack. $15 for one fan and case or $30 for four fans and four cases. What a deal!Fan keeps the Pi 4 cool, perfect for serving up your favorite flavors of Linux. I can’t wait to buy another Pi!

I like this product for what it's built for, stacking your Pi's. However, the fans are absolute garbage! Three out of four are so noisy I can't even use them and the fourth one has a loud hum. So I've unplugged them all. The heat sinks are on so that will work and like I said, having my Pi's all stacked is great. But if you are relying on the fans then I can't recommend this product.Update 5.13.22:I purchased the following to replace the fans that come with this kit and it fits and works fantastic! There is a third connector so you can actually set the temp when the fan comes on, and this heat sink/fan combo fits in the stackable acrylic case!https://www.amazon.com/dp/B091L1XKL6/ref=cm_sw_em_r_mt_dp_7H33KFTDX4W75ARZQ2ME?_encoding=UTF8&psc=1

Get extra stands off. You will need them. Connect a SSD to this as well

I have two problems with this cluster kit.1. The included fans are more like jet engines. I only have 3 fans on, in a "sealed" cabinet and the fans make more noise than than my workstation which is next to me.2. The standoffs did not align with some holes for both 3B+ and 4.