(Reuters) – The board of German 3D metal printing machine maker SLM Solutions Group AG on Tuesday recommended that its shareholders accept a takeover offer from Japanese camera maker Nikon Corp. Nikon announced last month its plans to take over SLM Solutions for 622 million euros ($607.20 million), in a bid to become the global leader in metal additive manufacturing. The Japanese company has obtained binding commitments from SLM Solutions’ key shareholders Elliott Advisors UK Limited (Cornwall), ENA Investment Capital and SLM Solutions’ founder Hans J. Ihde to support the transaction by way of…