Standalone high-pass filters are pretty uncommon for some reason - I find this odd since I myself use them quite a bit.
This is the companion module to my 2HP low and band-pass resonant filters and is a good fit for those clashy, percussive sounds as well as adding some spacey effects to lower-frequency signals. It's also capable of extremely shrieky self-oscillation if that's your idea of a good time.
Better still, it fits inside 2HP. Cool, huh?
Supplied with a laser-cut and engraved panel made from opaque 3mm perspex (design files available if you want to roll your own) - mounting hardware and power cable are also supplied.