I have a bad time filtering my IPA after UV curing it with a common funnel and filter due to the fact the filter clogs at the lower end of the funnel.
I designed this spacer to give more surface for the filter do it's work.
It was designed from the print funnel of the original creater...

Hint: You can scale for other funnels. And you can also use a second one to push the filter into shape.