Cirkul refill funnel

I love my Cirkul but I hate throwing out so much plastic with each spent cartridge. This funnel fits easily in a Cirkul cartridge for filling with other liquid. I'm using cheap store brand liquid and get several refills from one bottle. This was printed in the lowest resolution I could, .28. Infill was 75% but probably doesn't matter as there isn't much but shell layers.