After-hours buzz: Datalink, ExOne & 3D Systems

Check out which companies are making headlines after the bell Tuesday:

Datalink - Shares rallied in after-hours trading, after the data-storage company raised its fourth-quarter earnings-per-share and revenue guidance.

General Motors - The automaker's shares climbed in after-hours trading after it announced a quarterly dividend of 30 cents a share.

ExOne - Shares fell in after-hours trading after the 3-D company reduced its 2013 revenue expectations from its prior forecast.

3D Systems - A peer of ExOne, its shares also declined in after-hours trading.

—By CNBC's Kate Gibson

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