I waited for a month for the original author to respond wether there will be a V2 for 54mm portafilters, and then decided to make my own. This is not a scaled model, but a re-computed one.
Note this is the short version so you need to cut the needle handles. No matter what basket you use, the needles are in 2 lengths - 55mm and 45mm. The way to fit different basket is to adjust the needle depth configuration, which dictates the height of the base part.
The STL files are for my own configuration, 54mm portafilter and 26mm depth basket. Also included some similar configurations for your convenience. They are organized by folders.
Please export yourself on OnShape. Remember to uncheck Handle groove if you choose anything other than Long Tabs.
Note that I made many features available as configurations. So technically it will work for many different sizes.
For reference, these are the changes I made.
The author remixed this model.