This is a Don Labs version of the classic triple arm fidget spinner. It has trapezoidal teeth on the ends of the arms for extra grip when spinning. Utilising very common 608 bearings (skateboard bearings). Prints in 3 separate parts, the main spinner and a two part centre pin. The centre pin has a raised ring that sits on the metal part of the inner race of the centre bearing and the pin passes through the centre hole with a clearance fit for less spin resistance. The two centre pin parts are to be superglued together.

If printing, ensure the main spinner is printed with the chamfered holes facing up (chamfered to ease bearing insertion). Print the pins with the head face (the face you would have against your finger) on the print bed. Print all parts individually to avoid stringing and use minimum layer times with the pins to avoid melting and deformation.

Creality

Ender 3

No

No

0.12

25

PLA

Use at least 5 top layers and 5 bottom layers. Use at least 4 walls (I am using a 0.6mm nozzle). For standard 0.4mm nozzle you may want 6 walls. This will give extra strength for pushing the bearings in although they are not super tight.

608 bearings are very grease heavy (designed for high load) so they will need a touch of WD40 to get them spinning feely.