Summary: A pink & purple 3D Printed prosthetic arm for a 7-year old girl <br> has to be one of the most admirable uses of a 3D Printer. But only <br> charging $50 raised a lot of questions for us about design, engineering <br> and printing time. With the exception of such worthwhile charitable <br> ventures, can you really charge enough to cover the design and <br> fabrication time? Here's what Mark Lengsfeld had to say...<br>
