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What happened 

Shares of 3D Systems Corporation (DDD -5.22%) fell 22.7% in October, according to data provided by S&P Global Market Intelligence, as bad news roiled the industry. 

So what 

Proto Labs was the first to surprise the rapid prototype industry, posting a decline in third-quarter net income and expecting about a 20% drop in earnings per share for the fourth quarter. Competitive pressure and very little growth are starting to hurt the industry, which will trickle down to 3D Systems. 

GE also abandoned its attempt to buy SLM Solutions, which led to speculation that 3D Systems won't be acquired, either. Investors speculating on a potential buyout sold out of the stock. 

Now what 

If the 3D printing industry is in for slow growth, or even contraction, it would be bad news for 3D Systems. The company is losing money as it is and needs to have future growth to turn the bottom line around. 

Investors might want to be cautious about the future of the 3D industry right now, because if a broad decline is in store, it will hurt everyone. And without profits to fall back on, 3D Systems might be hurt more than most.