High-volume mass-production and customization of complex three-dimensional polymer and polymer-derived-ceramic microstructures are manufactured in a single step directly from three-dimensional computer models. An electromagnetic field is generated in the area of the guide channel by means of at least two inductors disposed at both sides of the metal strand to retain the coating material in the container. The invention also relates to methods for producing a soybean plant containing in its genetic material one or more transgenes and to the transgenic soybean plants and plant parts produced by those methods. A, B, and C are natural numbers satisfying freq=fref. In yet another embodiment, the excavator includes a plurality of excavating augers independently raised and lowered to vary the width of the ditch.