An awesome series of designs that fascinates and gives a little joy to everyone who plays with them!
Red, Yellow, Orange
I'm very new to 3D printing so I printed these with a brim to ensure good bed adhesion. A little bit of post-printing work to remove the brims, but it avoided any issues. Printed at 44 to 55 mm/sec with max speed 92% for the infill.
Bit of Wurth HHS2000 spray grease for lubrication worked a treat.