MAPLE PLAIN, Minn.--(BUSINESS WIRE)--Proto Labs, Inc. (NYSE:PRLB) today announced that it has reached agreement in principle to acquire select assets and operations of Alphaform, AG subject to standard terms and conditions of purchase. Alphaform is a leading service bureau headquartered in Feldkirchen (Munich), Germany. The planned acquisition will include Alphaform divisions operating in Germany, Finland and the United Kingdom. This acquisition will significantly expand Proto Labs’ additive ma