Spinner Ring - Print in Place, US Sizes 5-13, No Supports

A comfy fidget ring that prints fully assembled. The fluted outer band spins smoothly around the inner band on a hidden V-shaped track, and it can't come apart. It makes a great quiet fidget and an easy stocking stuffer.

Sizes

• 9 files for US sizes 5 to 13 (inner diameter 15.7 to 22.2 mm, in the file names)

• 8 mm wide, with a 3.3 mm wall. The outer diameter runs from 22.3 to 28.8 mm

• Not sure of your size? Measure the inside diameter of a ring that fits and pick the closest file

Design

• A 0.4 mm clearance on every moving surface, including the 45-degree track flanks, checked in CAD with no contact between the bands

• Captive: the 0.9 mm ridge overlaps the outer band by 0.5 mm. Even pushed fully to one side and lifted, the bands still interlock

• Both bands have 45-degree faces only, so nothing needs support, plus a bed-side relief gap of 1.2 mm so the first layer does not fuse them

• 36 grip flutes on the outer band, and softened outer edges

Print settings

• PLA or PETG, 0.12-0.16 mm layers for the smoothest spin, 0.4 mm nozzle, 3+ walls (the bands print almost solid), no supports, no brim

• About 1-3 g each (estimated; the bands print nearly solid)

• Calibrate your first layer. If the bands are stuck after printing, hold the inner band and twist the outer band firmly to break it free

Two-color option

The two bands are separate bodies in each file. In Bambu Studio, PrusaSlicer or OrcaSlicer, use "Split to parts" and pick a color for each band.

If you print one, please post a Make with a photo. It really helps, and I read every comment. Questions or fit issues? Leave a comment and I'll take a look.

About the images

All images are computer renders made from the exact STL files in this listing, not photos of a print. Colors and props (thread, cookies, batteries, keys, rope) are shown for illustration. Real print photos will be added as Makes come in.