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Wireless, modular motion tracking system for the most natural and intuitive interaction with video games, virtual reality, and more.
Wireless, modular motion tracking system for the most natural and intuitive interaction with video games, virtual reality, and more.
Created by
2,383 backers pledged $604,978 to help bring this project to life.

Recent updates


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Maunfacturing Update


Here’s the latest from the manufacturer. There are only few issues left to be resolved. When the solutions have been implemented, we’ll have a clearer picture of the production schedule.


Trigger Base Issues


Bumper button has friction to the trigger base when installed. Does not let the button float and return. Has a bad feel and sluggish action. Parts were trialed with different concentrations of glass filling. We settled on 15% glass filled nylon. Glass filled nylon is very stable, and can not be reset with a cooling fixture or heat cycles. So the problem will not improve over age.

Symptom Details

Pitch at tip is too small, causing drag on bumper button. Posts are not parallel. Slight inward angle is causing additional drag. Tool is built straight, but parts deform after molding.


Thick sections in between the posts are causing part warpage. Large sections shrink more and pull the posts inward. The purpose of hole “A” is unknown and adds more material in suspect area.

Suggested Solutions

  • Increased inner hole diameter to reduce material in area.
  • Remove material on underside of trigger base to ensure consistent wall thickness and improve part stability.
  • Increase fillets at base of cruciform posts to ensure geometric stability during and after molding.

Controller Handle Issues


Flanges between handle halves overlap slightly when screws are tightened.


Part was designed with a 0.25mm gap between screw bosses, causing an overlap at flange. The molded part exhibited a 0.5mm gap. Screw bosses are the hard stop in the part. Shell does not flex much, and overdrives the flanges. There is no reference surface to measure the bosses, relative to the flange.

Suggested Solution

  • Add 0.5mm of material to screw bosses on right side only. Left side part has the board mounted to it, and USB connector is centered in the plastics.


Once again, we thank you for your continued support.

Second Round of Refinements to STEM System Plastic Molds


After reviewing the last iteration of the plastics we determined that some issues were not entirely eliminated. Below are details of actions we are actively taking with our manufacturer to resolve the final errors in our housing design. Please note that these types of refinements are typical during this phase of plastics production.

These resolutions are estimated to be completed by the end of April and we’re expecting to receive the second round of test plastics from our manufacturer shortly thereafter.

We appreciate everyone’s continued patience with us as we iron out these final issues with the STEM System. These fixes will help ensure that the systems we ship have long lifetimes and consistent performance for both mobile and desktop VR.

STEM Plastics Update


First of all, we sincerely hope everyone had an enjoyable Holiday Season and we wish you all a very Happy New Year.

After making the required fixes to the plastic molds, as noted in the previous update, we are now awaiting shipment of the final plastics. All the electronics are ready for production; they merely require their housings. We’ll be providing another update in the next couple of weeks after we receive the plastics shipment and system assembly has begun.

Here is a video of the STEM System in final plastics. Please keep in mind that, as with the images in the previous update, these plastics are a “first shot” on the fixed molds and the texture finish is not representative of the final product.


STEM Plastics - First Look


We're very happy to share with you pictures of test STEM plastics, still warm.

Please keep in mind these images are of “first shot” plastics from our tools and do not represent the final plastic finish.








The test run revealed cosmetic and functionality-impacting errors and inaccuracies in the tools that are currently being corrected.  The following pictures show the errors.










Manufacturing Progress and Images


Here are progress reports and images from our plastics manufacturer:

































We still hope to start shipping in December and have all KS systems delivered by February.

To all of our backers in the USA, we’d like to wish you a Happy Thanksgiving!