Lyre 100% PLA. (project - making musical PLA strings)

After experimenting with making a PLA string of 0.8mm from 1.75mm filament, it turned out that this string was very strong and could really serve as a string for a stringed instrument. My previously published one-string instrument The Sound of PLA (Gopichand / Ektara) is an example of this. However, the manufacturing method published there meant that only 1 string diameter could be made because the stretch value (about 4,5-5x the original length) was fixed. The resulting diameter was always 0.8mm. A multi-string instrument requires several strings of different diameters to produce all the tones. So I started experimenting. After testing different methods and eventually working with the largest nozzle I had never used before: 0.8mm, it turned out to be possible to make different workable diameters fairly simple and reproducible. To obtain a round diameter of the final string, the base string should already be round. This eliminated the possibility of printing a line on the bed, as it is not round. Printing multiple layers is also not an option. In order to still obtain a starting string of a smaller diameter, I therefore needed the largest possible nozzle and had to print "in the air". However, letting a string flow loosely from the nozzle only gave 1 result, namely: the diameter of the nozzle. In order to obtain different round diameters, I created simple bridges and used the option of the slicer to influence the layer thickness. By printing increasing layer thicknesses, whereby the amount of filament ejected by the nozzle increased or decreased, it was possible to create different diameters with only one nozzle size. I then stretched these string pieces using the method described in my previous publication: using boiled water and immersion in a bowl with 2 small holes (see blockqoute at model The Sound of PLA). Because the strings were shorter, stretching was possible by pulling on the ends with both hands and moving the string through the bowl until all stretch wa