Chebyshev Amoeba Wheel Fidget

Chebyshev Amoeba Wheel is wheel-like mechanism based on Chebyshev linear linkage. The wheel was invented by Fumio Imai. The application of this wheel in some vehicle can give more friction than classical wheel because it has larger contact area with surface. 

The model is constructed from several parts, including 3D printed nuts and bolts. 

I strongly recommend test print of nut and bolt to test correct printer setting in your environment. Although there are some tolerances, I made them by testing in my environment (Bambu Lab P1P) and that tolerances may not work in your conditions. 

As an alternative, you can use some purchased M5 Nuts and Bolts of appropriate lengths, as described later. 

Printing instructions:

I printed all parts from PLA with 0.4mm nozzle:

• Layer height 0.2mm
• No supports
• Infill 15 %
• 2 perimeters
• 2 bottom and 5 top layers
• No Brim 

Parts list:

• Parts
  • 1x AW Central Rod
  • 8x AW Connection Rod
  • 8x AW Side Part
• Bolts and Nuts (in case you want to print them)
  • 8x AW Bolt M5x40mm
  • 8x AW Nut M5x5mm
  • 2x AW Bolt M5x18.5mm with excentric
  • 2x AW Handle 15mm with M5x4mm thread
• Bolts and Nuts to purchase (in case you don't want to print them)
  • 8x M5x40mm Bolt
  • 8x M5 Nut
  • 2x M5x18mm Bolt

Assembly Instructions:

1. Connect four Connecting Rods to one side of Central Rod using Bolt M5 18.5mm with excentric or purchased Bolt M5x18mm. The hole on tne excentric should match center of Central Rod.
2. Connect four Connecting Rods to opposite side of Central Rod using Bolt M5 18.5mm with excentric or purchased Bolt M5x18mm. The hole on tne excentric should match center of Central Rod.
3. Now you have to connect  free end of each Connecting Rod to two Side Parts 
   1. For connecting use 8x Bolt M5 40mm and M5 Nuts (printed or purchased)
   2. Connect first Connecting Rod and two Side Parts
   3. Connect another Side Part and Connecting Rod from opposite side of Central Rod
   4. Connect all remaining Connecting Rods and Side Parts. Be careful to alternate Connecting Rods from left and right side of Central Rod.
4. If you used Bolt M5 18.5mm with excentric in step 2, Add two pieces of Handle 15mm with M5 x 4mm thread to excentric.
5. The Assembly of Amoeba Wheel is finished 

More information about the Amoeba Wheel mechanism can be found in these videos: