Researchers successfully printed cellulose structures with resolutions down to 30 μm using specialized micro-nozzles.
The "RAR" in your query may actually refer to "Random Access Response" rather than the file extension. These files are typically circulated among engineers as ZIP or RAR archives containing technical specifications and proposal documents. 22044.rar
These papers often discuss Random Access Response (RAR) procedures in 5G NR (New Radio), specifically for non-terrestrial networks (satellite 5G). specifically for non-terrestrial networks (satellite 5G).