I am not sure in animals. In plants, chemical colchicine can be used for chromosome doubling. For example, haploid cells (ex. developed from anther/pollen culture) can be induced into double-hapolid (DH) line (2N=2x) through chromosome-doubling agents. DH lines are important sources for plant breeding-- to produce instant homozygous plant lines. The chromosome sets are doubled from 1x to 2x. But, I have not heard of any technique that can turn 1x chromosome set into 10x, then 20x or even 100x......

I am not sure in animals. In plants, chemical colchicine can be used for chromosome doubling. For example, haploid cells (ex. developed from anther/pollen culture) can be induced into double-hapolid (DH) line (2N=2x) through chromosome-doubling agents. DH lines are important sources for plant breeding-- to produce instant homozygous plant lines. The chromosome sets are doubled from 1x to 2x. But, I have not heard of any technique that can turn 1x chromosome set into 10x, then 20x or even 100x......

Can precision 3-D printing achieve it (using DNA building material) in the future??

Now, 3-D printing can print human body parts (see attached link). Maybe one day they can print tiny molecules such as chromosomes.

(2017 Nov) The firm that can 3D print human body parts (http://www.bbc.com/news/business-41859942)

**Copy and paste the link to view

I concur with my collegues. Looking at so many genes which may be contained in one chromosome, what will be the aim of the technique?

I think this article will help you

Article Chromosome Preparation From Cultured Cells

I know only cytogenetic techniques: culture of cells in medium containing phytohemagglutinin followed by the addition of colchicine. But they allow only the doubling of the amount of DNA in each chromosome.