Cirkul refill funnel
thingiverse
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.
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