1 F is the force of attraction between them. 2  G is a constant that is 6.67259 x 10-11 m3/kg s2. 3  M1 and M2 are the two masses that are attracting each other.  R is the distance separating the two objects.
A makerspace is a community center that provides technology, manufacturing equipment and educational opportunities to the public.
Shapeways is a great 3D printing marketplace. You can find the latest neat, unique items for sale here. Maybe one day it will be like Amazon but with all 3D printed things!