Ekobots - Chair wheel - Broyhill #41119 version

This Thing is a modified version of jsirgado's caster, with wheels of my own design, to fit my Broyhill model 41119 office chair (well, that's the model number used by "True Innovations", the supplier; it's actually a "Wal*Mart fall-apart special" 😛 ).

To be specific, I shrunk down the axle "hump" so that the caster fits the chair's ~50 x 5.7 mm wheel axle, and ~7mm diameter caster pivot (that's the lower part, 10.9 mm in the upper part). Grab a hammer, you'll need to pound pretty smartly to get the pivot and axle into their respective holes in the caster and wheels. :-) You may also need to pass a drill bit through the caster's axle hole to clean it up (easily done by hand).

The wheel is closely based on the chair's original wheels.

Use supports for both; beware of supports being inserted into the bottom of the caster pivot hole.

Print instructions

Licence: Creative Commons - Attribution Category: Office Print Settings

Printer Brand: RepRap

Printer: Prusa i3

Rafts: No

Supports: Yes

Resolution: 0.2 mm

Infill: 70%

Notes:

Someone in another Thing suggested printing their version with 2-3 mm worth of shells/top/bottom and high infill. In my case, 10 top/bottom layers and 8 shells.

Updated 2025-06-09: reinforced the wheel hub by extending the “spokes” all the way to the inner end.  Mine kept breaking where the spokes originally stopped.