Here is a pendulum swing sensory toy i designed for my son who has sensory needs and he loves it, i made it so he can drive cars through but its also a fun fidget to sit and swing. It does take a lot of parts but it is still an easy print and allows you to print in whatever colour suits or even use up the left over bits of filament,

you will need to print:

1x Base

2x A-frames

1x shaft

14x pendulum arms

I printed with 0.2 layer and 15% infill with 4 walls and its plenty strong enough, it is designed to be a stiff push fit so it doesnt really need glue but you can if you prefer