Share this project

Done

Share this project

Done
The Kappa QR improves the functionality of your keychain by providing quick, secure, and easy access to the items you carry every day.
The Kappa QR improves the functionality of your keychain by providing quick, secure, and easy access to the items you carry every day.
The Kappa QR improves the functionality of your keychain by providing quick, secure, and easy access to the items you carry every day.
652 backers pledged $36,540 to help bring this project to life.

About this project

Prometheus Kappa Keychain Quick Release

$36,540

652

FREE SHIPPING FOR THE FIRST 25 EARLY BIRDS IN EACH REWARD TIER! 

Oops I already messed up. I totally forgot to add shipping to the pledge levels. First, super sorry about that. Second, I've created an "early bird" reward tier that will get free shipping, limited to 25 backers in each tier. 

Unfortunately I can't edit the name of that tier, so I hope it's not too confusing. Backers that don't get in on the limited tier will pay standard shipping rates. 

****************************************************************************

 

The Prometheus Kappa Quick Release (QR) design is identical to (and compatible with) the Beta-QRv2 Keychain Flashlight quick release. Just like the Beta-QR, sometimes you have things on your keychain that you may need to quickly and easily detach. That might even be your keys! The Kappa QR delivers the same convenience and security in an entirely new way.

 

The Kappa-QR uses a proprietary “canted coil spring” to provide a “snap together” action: three pieces, no moving parts, nothing to break, and the spring is replaceable if that’s ever needed.

The spring is custom manufactured to my exact specification by a US company that specializes in only this type of spring. It’s commonly used for electrical and mechanical interconnects on everything from heart implants, military electronics, and stuff that flies in space.

 

Twisting the two halves while connecting/disconnecting the QR will significantly reduce the amount of force required to connect/disconnect. This is the preferred method, though it is not strictly necessary. Just pretend like you are screwing (or unscrewing) the two halves… but there are no threads of course. The twisting action preloads the canted coil spring and makes it easier to compress.

 Kappa QR Information

  • 10 lbs Attach & Detach Force
  • Proprietary Canted Coil Spring
  • Snap On + Snap Off Capability

Quick Release

  • Pull + Twist Left to Disconnect
  • Push + Twist Right to Connect

 

If you follow my work closely, you’ll know that the Kappa QR was originally released with my last Kickstarter project for the Epsilon EKO. Until now, the Kappa was only available in brass but after a lot of requests, I'm ready to go all in and deliver a variety of new materials! 

Wait, no titanium? Unfortunately no. Titanium has proved too challenging to reliably machine the small groove that holds the spring. If I ever find a way to do this, you'll see the Kappa in Ti. 

The machining is dialed in and production is sorted. With the launch of this Kickstarter project, I am now offering the Kappa QR in a variety of materials to suit your needs and style!

The new Kappa QR Materials & Weights (Left to Right):

  • C360 Brass - 19 g
  • C145 Tellurium Copper - 20 g
  • 6061-T6 Aluminum (Electroless Nickel Plated) - 10 g
  • Delrin® (Polyoxymethylene Thermoplastic) - 7 g
  • Lexan® (Polycarbonate Thermoplastic) - 7 g

Kappa QR Measurements:

  • Attached By Itself - 1.25" L x 0.49" W
  • With 25 mm Split Rings - 2.8" L x 1.0" W
  • With 20 mm Split Rings - 2.4" L x 0.8" W

The Kappa QR was designed from a personal necessity to improve the functionality of my keychain. I carry a number of different items, but I don't always want to deal with my entire keychain when I just need to use one thing. 

Incidentally, you can also connect the Beta QRv2 flashlight to any other item with a QR if you need a grab-and-go combo. I have taken to putting my car fob on a separate Kappa QR. Whenever I leave my car (hiking, taking the dog to the beach, mtn biking, etc.) I just take the fob connected to the flashlight with me and leave the rest locked in the car.

House keys on a separate QR are awesome for unlocking my shop gate... when I still have to drive through but don't want to take the key out of the ignition... or when I forget something in the house after getting into the car.

Use the QR in your bag to easily attach and detach your keys without having to dig through everything to find them. Be creative; be modular; be flexible in how you use your Kappa QR.

 

Those of you who know my projects know that I try to keep things as simple as possible, including pledging for rewards. So here is the deal:

Choose from three different pledge tiers. The more you pledge, the more you save! Material options will be chosen during fulfillment through Backerkit. All Kappas materials are the same price, and you will be able to "mix and match" finishes via the Backerkit survey. I know, cool right?  

  • Single – Get ONE Kappa QR at 20% below retail.
  • Three Pack – Get THREE Kappa QR’s at 30% below retail.
  • Five Pack – Get FIVE Kappa QR’s at 40% below retail.

Each Kappa QR comes with a set of four split rings (2x 25 mm & 2x 20 mm). They come disassembled so you can choose to use the size that works best for you.

The flat-sided split rings look a lot nicer than a standard round-sided ring and are made from corrosion resistant 302 stainless steel. Normal split rings are chrome plated carbon steel which eventually wears off and can corrode when exposed to moisture. 

As with my past Kickstarter projects, I'm using a platform called Backerkit to manage the fulfillment process. Participation is not mandatory...but is greatly appreciated :) My experience demonstrates that Backerkit is a critical tool in delivering the right reward to the right person at the right time, and that's good for everyone. 

You may choose to opt out of Backerkit, but it may delay/complicate the delivery of your reward. Most serious project creators are using Backerkit because it makes backers happy. Notice it's called Backerkit and not Creatorkit ;) Fulfillment and data tracking are exceedingly difficult on any project. Asking me to manually manage your contact information is time consuming. This is time spent at the computer and not in the shop making parts or shipping rewards. Be a team player and we all win!

  • You'll be asked to confirm your pledge information and provide your shipping address through Backerkit.
  • Backerkit puts you in control of your pledge by allowing you to manage your own order quantity and shipping address.
  • You will not receive a Kickstarter survey requesting this information.
  • If you opt out of Backerkit, you will not have the option to modify your reward quantities.

Production for the Kappa QR is all done in-house. Machining is done on both a Haas ST-10Y and a ST-10 CNC Lathe. Laser marking the Prometheus logo is also done here along with fitting the springs and final assembly. Doing everything in-house means I'm able to minimize external risks along with making a high quality product.

Production Schedule:

The following is an estimate, not a guarantee.

I’m leaving plenty of time in the production schedule in case the project does better than I think it will. Fingers crossed! :)

 

Risks and challenges

One of the advantages to doing most of the work in-house is that it minimizes external risks. The spring manufacturer specializes on only this type of spring and has been exceedingly reliable in terms of delivery and quality.

Machining and assembly is done completely in-house, and I've already put the Kappa QR through first-run manufacturing. Normally the "figure it out" work starts when funding is completed. In this case, for your convenience and my sanity, I've already done all of that.

The major risks to this project will be flood, earthquake, tsunami, giant meteor impact, and/or a sudden sub-zero cold spell that freezes 80% of the earth overnight.

Seriously though, the real risks are still large ones like a piece of machinery suffering a major malfunction.

Learn about accountability on Kickstarter

Questions about this project? Check out the FAQ

Support this project

  1. Reward no longer available

    Pledge $20 or more About $20

    Kappa QR Single

    Get ONE Kappa QR at 20% below retail. Material option will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    Reward no longer available 25 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  2. Select this reward

    Pledge $20 or more About $20

    Kappa QR Single (non early bird)

    Get ONE Kappa QR at 20% below retail. Material option will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    180 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  3. Reward no longer available

    Pledge $52 or more About $52

    Kappa QR Three Pack

    Get THREE Kappa QR's at 30% below retail. Material options will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    Reward no longer available 25 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  4. Select this reward

    Pledge $52 or more About $52

    Kappa QR Three Pack (non early bird)

    Get THREE Kappa QR's at 30% below retail. Material options will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    235 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  5. Reward no longer available

    Pledge $75 or more About $75

    Kappa QR Five Pack

    Get FIVE Kappa QR's at 40% below retail. Material option will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    Reward no longer available 25 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  6. Select this reward

    Pledge $75 or more About $75

    Kappa QR Five Pack (non early bird)

    Get FIVE Kappa QR's at 40% below retail. Material option will be chosen during fulfillment.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    155 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.

Funding period

- (30 days)