After converting my FLSUN QQ-S to Klipper I wanted to try out the resonance compensation feature but I couldn't find a simple and sturdy mount for an ADXL345 accelerometer board so I created one.

It attaches to the front screw of the effector and although there's only one screw holding it in place it's designed with a slot for the screw so it can be pushed flush with the front metal edge which prevents any movement. This also perfectly aligns the ADXL345 with the printer's X and Y axes and creates a very rigid connection with the effector.

You'll need 2 M3 x 8mm bolts with nuts to attach the ADXL345 to the mount.