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I have tried to reduce the resolution of my stl file. I found 3 ways to do it,and I only try the third.

1. Use SOLIDCast to reduce the triangle number.

http://www.cast-cae.com/forum.php?mod=viewthread&tid=385

1. Use 3ds Max to reduce the vertex.

http://www.ddove.com/3dmax/sl/tut_using_the_vertex_weld_modifier.html

1. Use Inventor to export stl file with options.

It can be choice : high,medium,low,custom

What I found is if I try to import the same motor stl with different resolution,

 load motor_lowest.stl（296k，about 0 sec）
 load motor_low.stl（512k，about 0 sec）
 load motor_medium.stl（1028k，about 3 sec）
 load motor_high.stl（2820k，about 10 sec）
 load motor_highest.stl（51M, very very long）

I have tried to reduce the resolution of my stl file. I found 3 ways to do it,and I only try the third.

http://www.cast-cae.com/forum.php?mod=viewthread&tid=385

http://www.ddove.com/3dmax/sl/tut_using_the_vertex_weld_modifier.html

It can be choice : high,medium,low,custom

What I found is if I try to import the same motor stl with different resolution,

 load motor_lowest.stl（296k，about 0 sec）
 load motor_low.stl（512k，about 0 sec）
 load motor_medium.stl（1028k，about 3 sec）
 load motor_high.stl（2820k，about 10 sec）
 load motor_highest.stl（51M, very very long）

I have tried to reduce the resolution of my stl file. I found 3 ways to do it,and I only try the third.

1.Use SOLIDCast to reduce the triangle number.

http://www.cast-cae.com/forum.php?mod=viewthread&tid=385

2.Use 3ds Max to reduce the vertex.

http://www.ddove.com/3dmax/sl/tut_using_the_vertex_weld_modifier.html

3.Use Inventor to export stl file with options.

It can be choice : high,medium,low,custom

What I found is if I try to import the same motor stl with different resolution,resolution successfully,

 load motor_lowest.stl（296k，about 0 sec）
 load motor_low.stl（512k，about 0 sec）
 load motor_medium.stl（1028k，about 3 sec）
 load motor_high.stl（2820k，about 10 sec）
 load motor_highest.stl（51M, very very long）