Form meets function
The dome top and knurled grip explain how to use it before you read anything.
Form & 3D PrintingSemester 2 · 2026
Capcea Infusion cap
A bottle cap that turns a drink into a ritual: twist, punch, shake.
- Material
- PLA, bright orange
- Process
- FDM 3D printing
- Parts
- 2: dome cap + threaded body with flavour chamber
- Mechanism
- Twist to unlock, punch blade
- Fit
- Standard 28 mm bottle neck
The cap screws onto a standard bottle. Twisting unlocks the inner chamber; a downward punch drives a semicircular blade through a thin membrane and drops a flavour sachet (fruit, masala, herbs) into the water.
01
Twist
Rotate the knurled outer ring to unlock the plunger.
02
Punch
Press the dome down with your thumb; the blade descends.
03
Cut
The blade punctures the membrane and releases the flavour.
04
Shake
Contents drop into the bottle. Shake and drink.
Playful ritual
Twist, punch, shake turns drinking water into a small daily delight.
Material as message
Bright orange signals citrus, energy and fun without any graphics.
01 · Mechanism
Making the punch work
Sketches worked out a silicone-sealed outer shell, a threaded inner shaft holding the masala, and a semicircular blade that cuts a paper or foil membrane when pressed, then springs back.
02 · Testing
On a real bottle
The printed cap was tested on a standard 28 mm bottle neck to check the thread, the twist-lock and how satisfying the punch feels.
What I learned
Takeaways
- 01Playfulness comes from sequence: twist, punch, snap, colour.
- 02A form can teach its use: a dome invites a press, a knurl invites a twist.
- 03Colour alone can carry the product’s mood.
- 04Mechanisms need tolerance testing on real parts; standard bottle necks vary.