Bottle Cap Upgrade

in 3D Rendering Services held by alwaysj
Contest Closed
  • Open
  • Choosing Finalist
  • Ended
Description:
The challenge is to make a water bottle cap that will fit most water bottles in the USA. This bottle cap must also be able to hold 15-20ml of a thicker liquid. A mechanism in the bottle cap allows said viscous liquid to be dispensed into the water below. The liquid chamber must be sealed until the user decides to dispense.

If you'd like a shot at the top prize, please use first prinicples and be innovative.

Yes, there are 2 such caps in China that do this (they don't fit USA water bottles). They are outdated in design and bulky so instead of iterating on existing designs, let's start from the fundamentals. Feel free to observe but not be inspired; we're aiming for something completely new here.

Please prioritize and optimize:
-Sealing
-Bottle compatibility
-User experience/ease of use
-Premium Aesthetics

It might be worth referencing Hy-Conn, an a sharktank product that allows firefighters to connect hoses to fire hydrants instantly instead of the usual 20-30 second delay due to threading.

Its a relatively simple project (besides the threading), and I do want it to be a bit of a challenge, so 3 days it is!

Don't hesitate to ask any further questions and good luck!
Wants:
Secure, leak-proof fit (cap must screw on smoothly with consistent torque and no wobble).
Innovative mechanism that allows easy operation (one handed if possible).
Don't Wants:
-Inspired by Chinese design
-Bulky
-Overly Complex
-Designs that compromise on reliable sealing or clean dispensing
Ask for Sample:
Please submit a high-level concept design first (simple 3D model or render showing overall cap shape, thread interface on a standard USA water bottle neck, basic dispensing feature, and key dimensions). This is a focused first-principles design project, so prioritize creative yet practical solutions for sealing, clean dispensing, ergonomics.
Additional Information
PLEASE WATCH THE REFERENCE VIDEO IN THE COMMENTS

The bottle cap may be sports/squirt type bottle cap or the traditional twist open/close. Totally up to you. Again, we're aiming for ingenuity here.

It's also important to note that these caps will be disposable and not reusable so any high cost materials are discouraged ie stainless steel etc.

AI files on their own without CAD or some way to show the working mechanism will not be eligible!

Entries

= Buyer's Rating
#61 SpinFlow Cap by as_win_pk_
#60 TWIST-PISTON ISOLATION CAP (TPIC) by achmadfadlan
#59 Bottle Cap by abidrasool
#57 Bottle Cup by suhermanwinong
#54 Multi-Use Refillable Pull & Press Smart Cap by as_win_pk_
#51 Aurora Cap by alexcool
#50 Multi-Use Refillable Pull & Press Smart Cap by as_win_pk_
#49 Bottle Cap Upgrade by Aman Ghimire
#48 Update by Manp
#44 Upgraded cap by as_win_pk_
#43 Upgraded cap by as_win_pk_
#42 Proof of concept CAP with thread by MécaCim
#40 Submit Your Design by Azadservice
#38 TwistShot Bottle Cap by Sarab
Declined
#37 TwistShot Bottle Cap by Sarab
Declined
#36 Bottle Cap Upgrade by Mattdos
#35 Liquid Dispensing Cap V1(initial concept) by elbashire
#34 DECANT Bottle Cap Upgrade by Jinen Sheth
#33 Single-Action Puncture-and-Dispense Bottle Cap by Richard_Joe
#30 Bottle Cap Upgrade by Busyb
#29 bottle cap Actuator by ridwans
#28 Bottle Cap Upgrade by Mattdos
#27 Press type cap by yaswantr
#26 Push pull cap with liquid dispenser by adamrockler
#25 premixed syrup dosing bottle cap by AR_CAD_SERVICE
#23 Water Bottle Cap by Jaydip_23
#22 Bottle cap_2 by clintsar
#21 Bottle Cap Upgrade V2 by kevinb6132
#20 Bottle Cap Upgrade-C2 by alirezaemamian
Declined
#19 Bottle Cap by Tarun Kumar Dutta
#17 Viscous fluid adding bottle cap by kevinb6132
#15 FlowCap™ – Premium Integrated Liquid Dispensing Bottle Cap by calvinceowino
#14 Submit Your Design by Azadservice

Discussion

Showing last 20 comments - View All
abidrasool

abidrasool

Designer

Sat, 25 Jul 2026 06:48:47 +0000
Any changes
thealidev

thealidev

Designer

Fri, 17 Jul 2026 05:33:26 +0000
Can You Look At It
ridwans

ridwans

Designer

Wed, 15 Jul 2026 09:14:07 +0000
hi @alwaysj

im already sent CAD file
adamrockler

adamrockler

Designer

Wed, 15 Jul 2026 06:10:47 +0000
is there anything specific you prefer i can change the outlet to flipflop or anything you want.
yasht6

yasht6

Designer

Mon, 13 Jul 2026 18:49:28 +0000
Hey @alwaysj , any improvements that you would like to suggest?
Richard_Joe

Richard_Joe

Designer

Mon, 13 Jul 2026 11:06:04 +0000
Hi @alwaysj, concerning your recent comments on this design , yes tit is configured to US bottles (PCO 1810), and both Native CAD files and STEP files are included in the submission.
ioeng

ioeng

Designer

Mon, 13 Jul 2026 10:06:55 +0000
@alwaysj please take a look at my design.
Mattdos

Mattdos

Designer

Mon, 13 Jul 2026 08:21:15 +0000
Entry 36 is not reuseable once the button is pressed that's the end
abidrasool

abidrasool

Designer

Mon, 13 Jul 2026 08:18:45 +0000
Waiting For your Feedback
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:34:40 +0000
Was this design with reusability in mind? We're going for a cap thats single use and to be discarded with the bottle its on.
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:31:04 +0000
Solid design. However, would love to avoid foil and any puncturing to avoid fragments in drink. The size and overall appearance matches what I had envisioned.
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:27:50 +0000
do you have CAD files?
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:23:08 +0000
would like it done without puncturing anything as to avoid fragments in the drink
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:21:36 +0000
Very nice. Please make it so its not "hold to dispense" but rather a one time activation that dispenses everything
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:16:33 +0000
Is it possible to make this with less parts and also make the dispense rate faster with a bigger outlet
alwaysj

alwaysj

Buyer

Mon, 13 Jul 2026 07:13:00 +0000
Is this configured to US bottles?
as_win_pk_

as_win_pk_

Designer

Sun, 12 Jul 2026 10:22:07 +0000
Hi @alwaysj , can you rate recent uploads?
alwaysj

alwaysj

Buyer

Sun, 12 Jul 2026 03:54:08 +0000
I have uploaded measurement of the contraption. I suspect our cap will hold around 50% or less of the reference.
alwaysj

alwaysj

Buyer

Sun, 12 Jul 2026 03:48:13 +0000
So far, Jinen and AdamRockler are the closest! If you want a shot at the prize, please reference the video and the submissions of both these gentlemen because it seems from current submissions that any upgrades will have to be based on current models. Squirt, flip top, or twist is up to you but Flip top will be preferred!
alwaysj

alwaysj

Buyer

Sun, 12 Jul 2026 03:37:09 +0000
Please watch the reference video and try to minimize parts! You're a close contender!

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