What is the impact of Greece on a Stock with excellent fundamentals?

Hi. I intend to hold a very good growth stock for long term. It is 3D Systems and i strongly believe in their future to revolutionize the manufacturing industry with their 3D printer products and turn the 3D printing industry into a trillion dollar industry in 5 - 10 years. Now i've been observing the market for a few months now gaining understanding of the impacts of the headlines i see on many stocks. But here's the problem. I have invested 9400 euros in 500 shares at $24.30 and the stock reached $31 and fell again on bad news and now went back up to 28.40. With the euro at $1.26 this gives me a profit of 1800 euros if i liquidate my stock now. I intend to keep the stock for long term but with the possible exit of Greece i don't know what to do.... What impact will Greece's exit have on a stock like 3D Systems with really good fundamentals? Will it definitely fall or could it rise despite a Greece's exit from the euro zone? Should i better liquidate and anticipate the stock falling when the greek exit happens then buy it back at a cheaper price? Or should i really stick to my long term standing and ride the roller coaster? I'm just afraid that if i sell and it doesn't get affected by Greece's exit that i will miss BIG time... please i need advise from very experienced fundamental analysts and investors....