This machine is intended as a wall decoration but you can use it as a timer i guess :P. I tried to make it as simple as posible, i hope the the assembly video is clear enough.

Assembly video:

• Print the Pendulum2 and the ArmMod1 twice.
• For weight i used this big ball bearings together weighing 120g. If it's jumping around reduce the weight.
• You can glue the not moving parts, Placers in place EXCEPT the bottom one.