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DIY 3D-printer for powder-based prototyping: Pwder! - 3D Printing Industry
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iro3d enters production and reports four customers of Selective Powder Deposition metal 3D printer - TCT Magazine
OpenSLS - An Open Source Project Creates a Sub-$15K Selective Laser Sintering 3D Printer - 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing