Noctua Ventilador Nf-a4x10 5v 40 Mm

This was to upgrade the hotend fan in an I3 Mega Pro and it fit perfectly. Took maybe 10 minutes to install and drastically reduced how loud the printer was when running. I can absolutely recommend this for an upgrade. While it is a bit more expensive the quality on offer is more than. Worth it imo.

If you want a compact fan that fits inside a Raspberry Pi case, this probably isn't it, unless the case is quite roomy. It can be made to work in a pinch, however.

Very well packaged and comes with all the accessories that you will need to connect up to your device.

This is a great quiet fan, nice airflow. Used it to replace the cooking fan on my Monoprice 3D printer.

What else is there to say, it's a Noctua fan.....it's awesome!!!