.gitignore

@@ -1,6 +1,9 @@
 # Generic files to ignore.
 .*
 
+print3d.rsa
+print3d.rsa.pub
+
 # Python temp paths.
 __pycache__/
 *.py[cod]
@@ -17,3 +20,4 @@ __pycache__/
 
 # Locally built extensions.
 /*.zip
+

source/__init__.py

@@ -47,6 +47,11 @@ class SceneProperties(PropertyGroup):
         description="Apply scene scale setting on export",
         default=False,
     )
+    use_ascii_export: BoolProperty(
+        name="ASCII",
+        description="Exporting file in ASCII format, export binary as binary otherwise.",
+        default=False,
+    )
     use_data_layers: BoolProperty(
         name="Data Layers",
         description=(

source/export.py

@@ -100,7 +100,7 @@ def write_mesh(context, report_cb):
         filepath = bpy.path.ensure_ext(filepath, ".stl")
         ret = bpy.ops.wm.stl_export(
             filepath=filepath,
-            ascii_format=False,
+            ascii_format=print_3d.use_ascii_export,
             apply_modifiers=True,
             export_selected_objects=True,
             global_scale=global_scale,
@@ -109,7 +109,7 @@ def write_mesh(context, report_cb):
         filepath = bpy.path.ensure_ext(filepath, ".ply")
         ret = bpy.ops.wm.ply_export(
             filepath=filepath,
-            ascii_format=False,
+            ascii_format=print_3d.use_ascii_export,
             apply_modifiers=True,
             export_selected_objects=True,
             global_scale=global_scale,

source/ui.py

@@ -135,6 +135,9 @@ class VIEW3D_PT_print3d_export(View3DPrintPanel, Panel):
         col.prop(print_3d, "use_apply_scale")
         col.prop(print_3d, "use_export_texture")
         sub = col.column()
+        sub.active = print_3d.export_format in ("STL", "PLY")
+        sub.prop(print_3d, "use_ascii_export")
+        sub = col.column()
         sub.active = print_3d.export_format != "STL"
         sub.prop(print_3d, "use_data_layers")