This is a snap on extension for the Perky-Pet YSSF00346-2 Straight-Sided Thistle Seed Wire Mesh Tube Finch Bird Feeder. I wanted to raise the lip on the bottom a bit so that the seed didn’t fall out so easily when the goldfinches flew off.

I made this in Onshape. I measured the feeder and based the design off the measurements. There was a bit of trial and error since I had trouble measuring the base diameter accurately. This is a link to the original if you would like to modify it: https://cad.onshape.com/documents/f2666135cc0f46aded7052e3/w/254cb7c10964ff409ffa9a3a/e/9a4d30f47ac822f139849189?renderMode=0&uiState=64f27647e6184c316737943a