Customizable squeeze bottle lid.
thingiverse
I'm building a tiny cap for low-cost squeeze bottles that will hold two-part silicone rubber without making a mess. I'm using these to store the rubber. **Beware:** The safety of using 3D printed parts with food depends on your plastic and nozzle material - brass might contain lead, so be cautious. Before you decide it's safe, read up on 3D printing and food safety. Also, check out http://www.thingiverse.com/thing:35709 for an alternative solution under a more restrictive license.
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