Many people ask for them, but no. Movable solid objects such as balls, strings, and gears will not be coming without a complete rewrite of the Powder Toy Program. So to keep the masses satisfied, here's how to make a basic moving solid ball. Only SPNG works!
Currently, SPNG is the best working solid for this. Others, like GOO and BCLN work to a small extent, and most elements don't work at all. Making it work
Make a large ball (or cube) of SPNG in the rough middle of the screen. This will be the solid that will move. Go into console. Write the following:
set vx spng 1
Congratulations, your SPNG will now move right at a speed of one.