Funnel
thingiverse
I use this funnel to transfer e-juice directly from a large bottle into a smaller 50ml container. The funnel's diameter measures precisely 8mm, making it a perfect fit for bottles of the same size and design: Amazon offers these types of liquid bottles with funnels that are specifically designed for liquids and cigarettes at https://www.amazon.co.uk/liquid-bottles-funnels-liquids-cigarettes/dp/B01CYKIU14?ref_=fsclp_pl_dp_3
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