diff --git a/bimport.py b/bimport.py
index 85cadbe..27cd8b5 100644
--- a/bimport.py
+++ b/bimport.py
@@ -4,10 +4,11 @@ from bpy.props import (
     BoolProperty,
     EnumProperty,
     IntProperty,
+    FloatProperty,
     CollectionProperty,
 )
 from bpy.types import Operator
-from bpy_extras.io_utils import ImportHelper
+from bpy_extras.io_utils import ImportHelper, ExportHelper
 from io_scene_gltf2 import ConvertGLTF2_Base
 import importlib
 
@@ -15,31 +16,20 @@ import importlib
 if "Font" in locals():
     importlib.reload(Font)
 else:
-    pass
+    from .common import Font
 
 if "utils" in locals():
     importlib.reload(utils)
 else:
     from .common import utils
 
-try:
-    from io_scene_gltf2.io.imp.gltf2_io_gltf import glTFImporter, ImportError
-    from io_scene_gltf2.blender.imp.gltf2_blender_gltf import BlenderGlTF
-    from io_scene_gltf2.blender.imp.gltf2_blender_vnode import VNode, compute_vnodes
-    from io_scene_gltf2.blender.com.gltf2_blender_extras import set_extras
-    from io_scene_gltf2.blender.imp.gltf2_blender_node import BlenderNode
-except (ModuleNotFoundError, ImportError):
-    from io_scene_gltf2.io.imp.gltf2_io_gltf import glTFImporter, ImportError
-    from io_scene_gltf2.blender.imp.blender_gltf import BlenderGlTF
-    from io_scene_gltf2.blender.imp.vnode import VNode, compute_vnodes
-    from io_scene_gltf2.blender.com.extras import set_extras
-    from io_scene_gltf2.blender.imp.node import BlenderNode
-
 
 # taken from blender_git/blender/scripts/addons/io_scene_gltf2/__init__.py
 
 
 def get_font_faces_in_file(filepath):
+    from io_scene_gltf2.io.imp.gltf2_io_gltf import glTFImporter, ImportError
+
     try:
         import_settings = {"import_user_extensions": []}
         gltf_importer = glTFImporter(filepath, import_settings)
@@ -60,7 +50,7 @@ def get_font_faces_in_file(filepath):
                 out.append(node.extras)
         return out
 
-    except ImportError:
+    except ImportError as e:
         return None
 
 
@@ -70,7 +60,7 @@ def get_font_faces_in_file(filepath):
 class GetFontFacesInFile(Operator, ImportHelper):
     """Load a glTF 2.0 font and check which faces are in there"""
 
-    bl_idname = "abc3d.check_font_gltf"
+    bl_idname = f"abc3d.check_font_gltf"
     bl_label = "Check glTF 2.0 Font"
     bl_options = {"REGISTER", "UNDO"}
 
@@ -87,6 +77,7 @@ class GetFontFacesInFile(Operator, ImportHelper):
 
     def check_gltf2(self, context):
         import os
+        import sys
 
         if self.files:
             # Multiple file check
@@ -109,7 +100,7 @@ class GetFontFacesInFile(Operator, ImportHelper):
 class ImportGLTF2(Operator, ConvertGLTF2_Base, ImportHelper):
     """Load a glTF 2.0 font"""
 
-    bl_idname = "abc3d.import_font_gltf"
+    bl_idname = f"abc3d.import_font_gltf"
     bl_label = "Import glTF 2.0 Font"
     bl_options = {"REGISTER", "UNDO"}
 
@@ -294,6 +285,11 @@ class ImportGLTF2(Operator, ConvertGLTF2_Base, ImportHelper):
 
     def unit_import(self, filename, import_settings):
         import time
+        from io_scene_gltf2.io.imp.gltf2_io_gltf import glTFImporter, ImportError
+        from io_scene_gltf2.blender.imp.gltf2_blender_gltf import BlenderGlTF
+        from io_scene_gltf2.blender.imp.gltf2_blender_vnode import VNode, compute_vnodes
+        from io_scene_gltf2.blender.com.gltf2_blender_extras import set_extras
+        from io_scene_gltf2.blender.imp.gltf2_blender_node import BlenderNode
 
         try:
             gltf = glTFImporter(filename, import_settings)
diff --git a/butils.py b/butils.py
index 6663a1a..9b696d1 100644
--- a/butils.py
+++ b/butils.py
@@ -358,7 +358,7 @@ def turn_collection_hierarchy_into_path(obj):
 def find_font_object(fontcollection, font_name):
     fonts = find_objects_by_custom_property(fontcollection.objects, "is_font", True)
     for font in fonts:
-        if font["font_name"] == font_name and font.parent is None:
+        if font["font_name"] == font_name and font.parent == None:
             return font
     return None
 
@@ -375,7 +375,7 @@ def move_in_fontcollection(obj, fontcollection, allow_duplicates=False):
     # parent nesting structure
     # the font object
     font_obj = find_font_object(fontcollection, obj["font_name"])
-    if font_obj is None:
+    if font_obj == None:
         font_obj = bpy.data.objects.new(obj["font_name"], None)
         font_obj.empty_display_type = "PLAIN_AXES"
         fontcollection.objects.link(font_obj)
@@ -386,7 +386,7 @@ def move_in_fontcollection(obj, fontcollection, allow_duplicates=False):
 
     # the face object as a child of font object
     face_obj = find_font_face_object(font_obj, obj["face_name"])
-    if face_obj is None:
+    if face_obj == None:
         face_obj = bpy.data.objects.new(obj["face_name"], None)
         face_obj.empty_display_type = "PLAIN_AXES"
         face_obj["is_face"] = True
@@ -678,8 +678,8 @@ def is_metrics_object(o):
     if f"{utils.prefix()}_type" in o:
         return o[f"{utils.prefix()}_type"] == "metrics"
     return (
-        re.match(".*_metrics$", o.name) is not None
-        or re.match(".*_metrics.[\d]{3}$", o.name) is not None
+        re.match(".*_metrics$", o.name) != None
+        or re.match(".*_metrics.[\d]{3}$", o.name) != None
     ) and is_mesh(o)
 
 
diff --git a/common/Font.py b/common/Font.py
index e7a7ac0..bcb7949 100644
--- a/common/Font.py
+++ b/common/Font.py
@@ -163,7 +163,7 @@ class Font:
 def register_font(font_name, face_name, glyphs_in_fontfile, filepath):
     if not fonts.keys().__contains__(font_name):
         fonts[font_name] = Font({})
-    if fonts[font_name].faces.get(face_name) is None:
+    if fonts[font_name].faces.get(face_name) == None:
         fonts[font_name].faces[face_name] = FontFace({})
         fonts[font_name].faces[face_name].glyphs_in_fontfile = glyphs_in_fontfile
     else:
@@ -193,9 +193,9 @@ def add_glyph(font_name, face_name, glyph_id, glyph_object):
 
     if not fonts.keys().__contains__(font_name):
         fonts[font_name] = Font({})
-    if fonts[font_name].faces.get(face_name) is None:
+    if fonts[font_name].faces.get(face_name) == None:
         fonts[font_name].faces[face_name] = FontFace({})
-    if fonts[font_name].faces[face_name].glyphs.get(glyph_id) is None:
+    if fonts[font_name].faces[face_name].glyphs.get(glyph_id) == None:
         fonts[font_name].faces[face_name].glyphs[glyph_id] = []
     fonts[font_name].faces[face_name].glyphs.get(glyph_id).append(glyph_object)
 
@@ -224,13 +224,13 @@ def get_glyph(font_name, face_name, glyph_id, alternate=0):
         return None
 
     face = fonts[font_name].faces.get(face_name)
-    if face is None:
+    if face == None:
         # print(f"ABC3D::get_glyph: font({font_name}) face({face_name}) not found")
         # print(fonts[font_name].faces.keys())
         return None
 
     glyphs_for_id = face.glyphs.get(glyph_id)
-    if glyphs_for_id is None or len(glyphs_for_id) <= alternate:
+    if glyphs_for_id == None or len(glyphs_for_id) <= alternate:
         # print(f"ABC3D::get_glyph: font({font_name}) face({face_name}) glyph({glyph_id})[{alternate}] not found")
         if glyph_id not in fonts[font_name].faces[face_name].missing_glyphs:
             fonts[font_name].faces[face_name].missing_glyphs.append(glyph_id)
@@ -243,7 +243,7 @@ def test_glyphs_availability(font_name, face_name, text):
     # maybe there is NOTHING yet
     if (
         not fonts.keys().__contains__(font_name)
-        or fonts[font_name].faces.get(face_name) is None
+        or fonts[font_name].faces.get(face_name) == None
     ):
         return "", "", text  # <loaded>, <missing>, <maybe>
 
@@ -286,7 +286,7 @@ MISSING_FACE = 1
 def test_availability(font_name, face_name, text):
     if not fonts.keys().__contains__(font_name):
         return MISSING_FONT
-    if fonts[font_name].faces.get(face_name) is None:
+    if fonts[font_name].faces.get(face_name) == None:
         return MISSING_FACE
     loaded, missing, maybe, filepaths = test_glyphs_availability(
         font_name, face_name, text