diff --git a/lib/thingiverse/connection.rb b/lib/thingiverse/connection.rb
index da50e8d..e0c0b54 100644
--- a/lib/thingiverse/connection.rb
+++ b/lib/thingiverse/connection.rb
@@ -35,7 +35,7 @@ def access_token=(token)
     def get_token
       auth_response = self.class.post(auth_url, :query => {:client_id => @client_id, :client_secret => @client_secret, :code => @code})
 
-      raise ResponseError.new(auth_response) unless auth_response.success?
+      raise ResponseError.from(auth_response) unless auth_response.success?
 
       response = CGI::parse(auth_response.parsed_response)
 
diff --git a/lib/thingiverse/pagination.rb b/lib/thingiverse/pagination.rb
index 7f7aa17..8bbf8a0 100644
--- a/lib/thingiverse/pagination.rb
+++ b/lib/thingiverse/pagination.rb
@@ -12,7 +12,7 @@ def initialize(response, object)
       @response = response
       @object   = object
 
-      raise ResponseError.new(@response) unless @response.success?
+      raise ResponseError.from(@response) unless @response.success?
 
       @objects = @response.parsed_response.collect do |attrs|
         @object.new attrs
diff --git a/lib/thingiverse/rate_limit_exceeded_error.rb b/lib/thingiverse/rate_limit_exceeded_error.rb
new file mode 100644
index 0000000..75c7d4d
--- /dev/null
+++ b/lib/thingiverse/rate_limit_exceeded_error.rb
@@ -0,0 +1,2 @@
+class RateLimitExceededError < ResponseError
+end
diff --git a/lib/thingiverse/response_error.rb b/lib/thingiverse/response_error.rb
index 2df9a86..6f8f5ef 100644
--- a/lib/thingiverse/response_error.rb
+++ b/lib/thingiverse/response_error.rb
@@ -1,5 +1,14 @@
 module Thingiverse
   class ResponseError < StandardError
+    def self.from(response)
+      case response.code.to_i
+      when 420, 429
+        RateLimitExceededError.new(response)
+      else
+        new(response)
+      end
+    end
+
     def initialize(response)
       @response = response
     end
diff --git a/lib/thingiverse/tags.rb b/lib/thingiverse/tags.rb
index 70eec53..95b0009 100644
--- a/lib/thingiverse/tags.rb
+++ b/lib/thingiverse/tags.rb
@@ -4,7 +4,7 @@ class Tags
 
     def self.find(tag_name)
       response = Thingiverse::Connection.get("/tags/#{tag_name}")
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
       self.new response.parsed_response
     end
 
diff --git a/lib/thingiverse/things.rb b/lib/thingiverse/things.rb
index 5a042ee..e5730b3 100644
--- a/lib/thingiverse/things.rb
+++ b/lib/thingiverse/things.rb
@@ -4,7 +4,7 @@ class Things
 
     def user
       response = Thingiverse::Connection.get("/users/#{creator['name']}")
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
       Thingiverse::Users.new response.parsed_response
     end
 
@@ -26,7 +26,7 @@ def ancestors(query = {})
 
     def tags
       response = Thingiverse::Connection.get(tags_url)
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
       response.parsed_response.collect do |attrs|
         Thingiverse::Tags.new attrs
       end
@@ -37,7 +37,7 @@ def save
         thing = Thingiverse::Things.create(@attributes)
       else
         response = Thingiverse::Connection.patch("/things/#{id}", :body => @attributes.to_json)
-        raise ResponseError.new(response) unless response.success?
+        raise ResponseError.from(response) unless response.success?
 
         thing = Thingiverse::Things.new(response.parsed_response)
       end
@@ -63,7 +63,7 @@ def upload(file_or_string, thingiverse_filename=nil)
       raise ArgumentError, "Unable to determine filename" if thingiverse_filename.to_s == ""
 
       response = Thingiverse::Connection.post("/things/#{id}/files", :body => {:filename => thingiverse_filename}.to_json)
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
 
       parsed_response = JSON.parse(response.body)
       action = parsed_response["action"]
@@ -96,7 +96,7 @@ def upload(file_or_string, thingiverse_filename=nil)
       if c.response_code == 303
         # finalize it
         response = Thingiverse::Connection.post(query['success_action_redirect'])
-        raise ResponseError.new(response) unless response.success?
+        raise ResponseError.from(response) unless response.success?
         Thingiverse::Files.new(response.parsed_response)
       else
         raise "#{c.response_code}: #{c.body_str}"
@@ -108,7 +108,7 @@ def publish
         raise "Cannot publish until thing is saved"
       else
         response = Thingiverse::Connection.post("/things/#{id}/publish")
-        raise ResponseError.new(response) unless response.success?
+        raise ResponseError.from(response) unless response.success?
 
         thing = Thingiverse::Things.new(response.parsed_response)
       end
@@ -120,7 +120,7 @@ def publish
 
     def self.find(thing_id)
       response = Thingiverse::Connection.get("/things/#{thing_id}")
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
       self.new response.parsed_response
     end
 
@@ -132,7 +132,7 @@ def self.create(params)
       thing = self.new(params)
 
       response = Thingiverse::Connection.post('/things', :body => thing.attributes.to_json)
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
 
       self.new(response.parsed_response)
     end
diff --git a/lib/thingiverse/users.rb b/lib/thingiverse/users.rb
index 4d3a3a1..2e94196 100644
--- a/lib/thingiverse/users.rb
+++ b/lib/thingiverse/users.rb
@@ -4,7 +4,7 @@ class Users
 
     def self.find(user_name)
       response = Thingiverse::Connection.get("/users/#{user_name}")
-      raise ResponseError.new(response) unless response.success?
+      raise ResponseError.from(response) unless response.success?
       self.new response.parsed_response
     end
   end