Nature, especially in spring, may be an inspiration for
a creative work. This year, however, the world is ruled by
different laws which push it to search for solutions which are not
obvious.
Usually the majority of innovations arise as a result of
conducting a laborious research which means hundreds of hours spent
in the laboratory. Unexpectedly, due to the epidemic of COVID 19,
there is an urgent need for finding new ideas to deal with the
emerging problems, for example there are attempts to remedy limited
availability of equipment by applying completely innovative
ideas.
The incremental technologies, known for over 20 years, i.e.
3D printing, have been rediscovered recently. The availability
and falling price of 3D printers have contributed to the increased
popularity of this manufacturing technique. One of the most popular
and cheapest printing technologies is FDM i.e. applying molten
thermoplastic material layer by layer. Usually FDM technology is
used for
