Keep busy

This time we are looking on the crossword clue for: Keep busy.
it’s A 9 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: AMUSE, PLY, TIEUP.

Last seen on: –Thomas Joseph – King Feature Syndicate Crossword – Mar 18 2020
NY Times Crossword 7 Oct 18, Sunday

Random information on the term “PLY”:

STL (STereoLithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL has several after-the-fact backronyms such as “Standard Triangle Language” and “Standard Tessellation Language”. This file format is supported by many other software packages; it is widely used for rapid prototyping, 3D printing and computer-aided manufacturing. STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact.

An STL file describes a raw unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule) of the triangles using a three-dimensional Cartesian coordinate system. STL coordinates must be positive numbers, there is no scale information, and the units are arbitrary.

An ASCII STL file begins with the line

PLY on Wikipedia