1. Overall form: triangular cap, circular bottom.
Ideally, the neck point is where the user will hold the tube. Change in shape helps the tube to rest nicely on user’s finger.
2. The funnel
Old design: funnel opening occupies half of the cap. I designed this to signal that the other half is closed and airtight, then I realise actually no need for user to know that.
Changes: Extend funnel so that the opening is big. User easily drops in liquid. Design is such that liquid will run down the wall nicely into to designated compartment.
3. The guiding fixture.
Making use of the live hinge on the cap, I created a protruded part so that the tube will always end up in the desired orientation.