drainers for bottles (bottle -> cup & bottle -> bottle)

Ever tried to completely drain a bottle with a low viscous fluid (e.g. silicone -> expensive!)?

print it - srew it on - put it on a cup or another bottle and let it drain

###dimensions###
outer diameter of bottle thread: 26.65mm
inner thread diameter: 24,4mm
thread pitch: 4mm
thread length: 13mm (25mm for bottle-bottle)

groove for cup (bottle to cup version):
outer: 91mm
inner: 81mm


If you're asking yourself why I designed 2 parts instead of one which fullfils both jobs: if I