What happened Industrial bellwether stock General Electric (NYSE: GE), maker of aircraft engines, gas turbines, and medical equipment, joined with new manufacturing economy 3D printing stocks Stratasys (NASDAQ: SSYS) and 3D Systems (NYSE: DDD) in a broad stock market rally Tuesday -- a snapback in response to some of the worst days on the stock market that we've ever seen. As of 1:40 p.m. EDT, shares of Stratasys had gained 12.3% over Monday's closing prices, 3D Systems was up nearly 9%, and GE had racked up a solid 5% gain. Image source: Getty Images. So what None of the three companies has put out any news of note today to explain the sudden turnaround in their fortunes -- not even giant GE, which is so big you might think it would be putting out press releases of some sort on a daily basis. Instead, all three stocks seem to be simply getting swept up in today's broad-based rally. Whether the rally continues may depend largely on why it formed in the first place. Is this, for example, simply a matter of short-sellers closing bearish bets and collecting profits before resuming their selling once more? In that case, today's stock market rally could be followed by a string of new stock market crashes in coming days. Or are investors warming up to promises of economic stimulus packages heard out of Washington -- bailouts for airlines and airplane makers that might benefit companies like GE (which sells airplane engines), as well as Stratasys and 3D (whose 3D printers can manufacture prototype and replacement parts useful in a variety of industries)? If investors become convinced that despite the coronavirus outbreak, the U.S. will somehow manage to buy its way out of the looming recession by printing government money, then there's at least a faint hope that in the coming days, investors might finally begin to make good some of the savage losses they've incurred over the last few weeks. At least, a Fool can hope. 10 stocks we like better than General ElectricWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and General Electric wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of December 1, 2019 Rich Smith has no position in any of the stocks mentioned. The Motley Fool recommends 3D Systems. The Motley Fool has a disclosure policy.Source