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Here are five things you must know for Tuesday, Sept. 6:

1. -- General Electric  (GE - Get Report) said Tuesday it acquired two 3D printing companies in Europe for $1.4 billion.

GE bought Arcam and SLM Solutions, both suppliers of additive manufacturing equipment, as it looks to bulk up the use of 3D printing in the manufacturing of jet engines and cars. 

Molndal, Sweden-based Arcam invented the electron beam melting machine for metal-based additive manufacturing and also produces advanced metal powders. SLM Solutions, based in Lucbeck, Germany, produces laser machines for metal-based additive manufacturing. 

GE will buy all the outstanding shares for each company. The company offered 285 Swedish kronor ($33.37) a share for Arcam, which represents a 53.2% premium to Arcam's Monday closing price. GE will maintain the headquarters and management for each company.

General Electric has invested $1.5 billion in manufacturing and additive technology since 2010. 

"We chose these two companies for a reason," said GE Aviation President and CEO David Joyce. "They each bring two different, complementary additive technology modalities as individual anchors for a new GE additive equipment business to be plugged and experience as leading practitioners of additive manufacturing."

GE shares were rising 0.3% in premarket trading on Tuesday.

GE is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells GE? Learn more now.

2. -- Bayer (BAYRY) , the German pharmaceutical giant, raised its bid again for seed company Monsanto  (MON) .

Bayer said it was offering $127.50 per Monsanto share, up from the rejected $125-a-share offer made in July that had valued Monsanto at $64 billion. The first unsolicited offer from Bayer came May 19.

Bayer said in a statement that the "key terms and conditions" of the latest proposals "have not yet been agreed."

Monsanto confirmed the new Bayer bid but wouldn't comment further as it evaluates it.

Monsanto shares were rising 2.8% in premarket trading to $110.40.

3. -- Volkswagen  (VLKAY) is reportedly planning to buy a minority stake in Navistar International  (NAV - Get Report) . 

Navistar shares were rising 26% in premarket trading Tuesday to $17.73.

The purchase would help provide Volkswagen with a foothold in the U.S. and bolster its global truck-market aspirations, people familiar with the situation told The Wall Street Journal.

The proposed transaction could be announced as early as Tuesday. VW plans to pay roughly $200 million for a nearly 17% stake in Navistar, according to the Journal.

4. -- U.S. stock futures were rising Tuesday as Wall Street came back from the three-day Labor Day weekend.
European stocks were trading mixed. Asian shares ended the session mixed in a quiet day of trading. 
Oil prices in the U.S. rose 1% to $44.89 a barrel early Tuesday amid speculation of a production freeze after the world's two largest oil producers, Russia and Saudi Arabia, agreed to act together to stabilize global oil output, the Associated Press reported.

The economic calendar in the U.S. Tuesday includes the ISM Services index for August at 10 a.m. EDT.

Earnings are expected Tuesday from Dave & Buster's (PLAY - Get Report) and TiVo (TIVO - Get Report) .

5. -- General Motors ( GM - Get Report) settled two so-called bellwether federal court cases related to its defective ignition switches but three more federal cases are scheduled to be heard next year, and one is scheduled for January 2018, a spokesman told the AP.

GM settled the cases for an undisclosed amount, plaintiffs' attorney Bob Hilliard said. In both cases, the plaintiffs said they sustained serious injuries when the air bags in their vehicles didn't deploy.

GM has acknowledged that ignition switches in older cars could fall out of position without warning and shut off the engine and air bags. GM knew about problems with the switches for more than a decade before it finally recalled 2.6 million small cars worldwide in 2014 to replace the defective switches. The switches are responsible for at least 124 deaths and 275 injuries, according to a victims' fund.