Charlyn Gonda's Friendship Bracelet Glows with Joy — Thanks to a Clever Custom Battery Clasp

A 3D-printed coin cell holder provides an LED noodle with the power it needs while doubling as a magnetic bracelet clasp.

Gareth Halfacree
17 days ago3D Printing / Lights / Wearables / Art / HW101

Maker Charlyn Gonda has built a friendship bracelet with a difference: it glows when snapped together, courtesy of a custom-made coin cell battery holder that doubles as a clever clasp.

"The world’s glowiest friendship bracelet," Gonda writes by way of introduction to the project. "This battery holder didn't exist, so I invented it — 3D-printed magnetic battery clasp! Bracelet is wrapped thread around an LED noodle, and 2 brass beads held together by copper wire."

The body of the bracelet is commercial "LED noodle" flexible LED filament string, hand-wrapped, which glows along its length when given power. Turning it into a bracelet, though, requires a way to provide the power, keep things stable, and still make it so you can put it on and remove it again — which is where the custom-built clasp-cum-battery-holder comes in.

"[The] top and bottom are symmetrical, [and] the conductive metal is pried from an existing battery holder," Gonda explains. "A half-circle raised geometry keeps it from rotating. Designed for a 1632 coin cell, but it’s parametric!"

Additional details on the project are available from Gonda's Twitter thread, though it has yet to be uploaded to her website.

Gareth Halfacree
Freelance journalist, technical author, hacker, tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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