Hi Bryghtness, There is a way to do this very simply with Carrara . You want to animate the speed your object spins ? Well, just animate the speed your object spins ! ;) - first, add a spin modifier to your object . Set the cycles per second to the speed you need for the beginning of your anim . - move the "timeline" to the end of your anim ( 5 sec on the images ) . Set the cycles per second to the speed you need for the end of your anim . Carrara automatically creates a keyframe . Have a look of what the characteristics of your object should like when you extend its tree in the sequencer . Of course, you can add as many keyframes as you like if you need some more complex speed modifications . Hope it helps ! litst