I am somewhat new to 3D printing - the designer and seller has been so helpful. He has answered my many questions without hesitation. He has been patient with me ( 79 years old ), and more than willing to help. I am so very grateful .... he is a good 'teacher' too. Very highly recommended. By the way, I, as a former long-time collector of antique farm equipment, can highly recommend his models. They are very authentic down to the finest details. Excellent models.