THIS THING IS NOT YET FINISHED OR TESTED

This is an update to my original omni wheel, this time parameterized in OpenSCAD, which I just learned. I still haven't gotten the O-rings in yet, so I've only been able to test basic fitting of the pieces, not if it actually works as an omni wheel.

The project is to remix Arcwave's O-ring based omni wheel with mbbackus's split-ring one.

Basically, Arcwave's O-ring idea is great for traction, but the spinners are on plastic axles in a plastic housing, so the rolling friction seems bad.

mbbackus's use of a split ring to provide the axle is awesome, but the spinners he uses are washers, so it seems like traction would suffer.

Lastly, I don't need them to be as big as either design, and I had 1.5" split rings on hand, so mine are also tiny, and use 8mm ID O-rings instead of 1/2" ones.

I haven't gotten the O-rings in yet, so right now they're partly untested. The wheel hub halves and spinners do indeed print and go together, but I haven't confirmed that the spinners will still work well with O-rings, and I haven't been able to test overall functionality. You're welcome to use them, but they might suck.

CUSTOMIZE the following

• Measure your split ring with a caliper and input its parameters
• Select O-rings with a size that works with the split ring you selected. Inner diameters under 8mm are not recommended.
• Jiggle additional settings as desired.

PRINT the following per wheel

• 2x hub halves*
• Spinners (quantity selected during customization, default is 10)

• I've also included an STL option for one full hub, but I'm not sure how you'd get a split ring on it when it's whole.

OBTAIN the following per wheel:

• (1x) split ring (key ring)
• A number of rubber O-rings (search on ebay, they're sold in the 100s for tattoo places, since they're used in piercings).
• Something to attach the two hub halves (screws, glue, etc.)

DO this stuff:

1. After printing, clean any debris from the spinners and slots in the hub.
2. Wrap each spinner with a rubber O-ring.
3. Put the spinners onto the split ring as you would a key.
4. Sandwich two hub halves into the split ring, maneuvering the spinners into the open slots.
5. For any spinners that don't spin freely, take them back off and widen the hole with a round file, drill bit, or you can even strip it wider with a screw.
6. Attach to robot, drive every direction ever.