Remix base of https://makerworld.com/en/models/423606#profileId-328279 / csmerchange to allow it to fit a bottomless portafilter. One shown in picture is an Andoer 54mm Bottomless Portafilter with an IMS Precision 18-22g filter basket.
so I had to open it up to fit over mine as I have an aftermarket bottomless portafilter AND and aftermarket filter basket. The original design eas too tight and did not fit on it properly.