Added 3D models.

3d/body.step

@@ -0,0 +1,2960 @@
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+    'Author'),(''),'Open CASCADE STEP processor 7.3','FreeCAD','Unknown'
+  );
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
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3d/cover.step

@@ -0,0 +1,4924 @@
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+ENDSEC;
+END-ISO-10303-21;

3d/ring.step

@@ -0,0 +1,344 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('FreeCAD Model'),'2;1');
+FILE_NAME('D:/Projects/SNC-IN4-7/3d/ring.step','2020-12-31T10:02:07',(
+    'Author'),(''),'Open CASCADE STEP processor 7.3','FreeCAD','Unknown'
+  );
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
+ENDSEC;
+DATA;
+#1 = APPLICATION_PROTOCOL_DEFINITION('international standard',
+  'automotive_design',2000,#2);
+#2 = APPLICATION_CONTEXT(
+  'core data for automotive mechanical design processes');
+#3 = SHAPE_DEFINITION_REPRESENTATION(#4,#10);
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+#5 = PRODUCT_DEFINITION('design','',#6,#9);
+#6 = PRODUCT_DEFINITION_FORMATION('','',#7);
+#7 = PRODUCT('Chamfer','Chamfer','',(#8));
+#8 = PRODUCT_CONTEXT('',#2,'mechanical');
+#9 = PRODUCT_DEFINITION_CONTEXT('part definition',#2,'design');
+#10 = ADVANCED_BREP_SHAPE_REPRESENTATION('',(#11,#15),#250);
+#11 = AXIS2_PLACEMENT_3D('',#12,#13,#14);
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+#14 = DIRECTION('',(1.,0.,-0.));
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