3D Printed Marble Run 

It depends... the stairs, for example, are about 30 grams (i.e., in standard PLA, perhaps 0,40 ct), but it takes about two hours to print them, using two printers;)

@@vhgvideo-ag thank you. So this would be expensive to print out by some one....

@@gaboaaa23 : ... but very much cheaper than buying the wooden ones at 15 EUR,--/piece! ;)

@@vhgvideo-ag that's for sure :)

one piece is 13 cents exactly