I printed and tested this with PLA

Parts list:Threaded inserts:

• Body: 4x M2x3x3.5
• Tooth: 1x M2x3x3.5 (for each tooth)

M2 Screws: 

• Body: 4x M2*6
• Tooth: 1x M2*6

Bearing:

•  OD: 22mm, ID: 8mm, Thickness: 7mm

Rubber pads:

• 6x 12mm

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I added slots for 6mm  diameter nuts (M6) in the Base and Spiral for weight. These are optional but it feels better to handle the Helping JawsI also used machine oil (any thin oil will work) to make it as frictionless as possible.