I was unaware you had any issues so you must be referring to communications with Shapeways. I cannot speak to the situation directly but I can say that out of the many people that have purchased these parts you are the only one to take issue with them.
I am sorry you have had a less than ideal experience but I would like to make it clear that this is a functional replacement part for the G35 and that your experience was most likely due to use with a different product or possibly a manufacturing problem.
I unfortunately cannot do anything for you as Shapeways is responsible for the manufacturing. I hope that you are able to find a solution that works for you.