I wanted a way to hold filters on the side of my Decent Espresso machine and I already had this portafilter holder on one side of my machine. I heavily copied the design of that model so that it would match fairly well.

This can be mounted to the side of the Decent Espresso machine using the stock holes and screws on either side of the machine.

It will hold a filter up to about 90mm in size. The filters in the photos attached are 55mm.