diff --git a/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printer.py b/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printer.py
index 254c926..68ad5ff 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printer.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printer.py
@@ -31,6 +31,7 @@
 # <http://www.gnu.org/licenses/>.
 
 import re
+import ldap.filter
 
 from univention.admin.layout import Tab, Group
 import univention.admin.uldap
@@ -324,9 +325,8 @@ def _ldap_pre_modify(self):# check for membership in a quota-printerclass
 		# cut off '/' at the beginning of the destination if it exists and protocol is file:/
 		if self[ 'uri' ] and self[ 'uri' ][ 0 ] == 'file:/' and self[ 'uri' ][ 1 ][ 0 ] == '/':
 			self[ 'uri' ][ 1 ] = re.sub( r'^/+', '', self[ 'uri' ][ 1 ] )
-		if self.hasChanged('setQuota') and self.info['setQuota'] == '0':
-			printergroups=self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(univentionPrinterQuotaSupport=1)(univentionPrinterSpoolHost=%s))'
-										   % self.info['spoolHost'])
+		if self.hasChanged('setQuota') and self.info['setQuota'] == '0' and self.info['spoolHost']:
+			printergroups = self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(univentionPrinterQuotaSupport=1)(|%s))' % (''.join(ldap.filter.filter_format('(univentionPrinterSpoolHost=%s)', [x]) for x in self.info['spoolHost'])))
 			group_cn=[]
 			for pg_dn in printergroups:
 				member_list = self.lo.get(pg_dn, attr=['univentionPrinterGroupMember','cn'])
@@ -338,7 +338,7 @@ def _ldap_pre_modify(self):# check for membership in a quota-printerclass
 
 
 	def _ldap_pre_remove(self): # check for last member in printerclass
-		printergroups=self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(univentionPrinterSpoolHost=%s))'%self.info['spoolHost'])
+		printergroups = self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(|%s))' % (''.join(ldap.filter.filter_format('(univentionPrinterSpoolHost=%s)', [x]) for x in self.info['spoolHost'])))
 		rm_attrib=[]
 		for pg_dn in printergroups:
 			member_list=self.lo.search( base=pg_dn, attr=['univentionPrinterGroupMember','cn'])
diff --git a/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printergroup.py b/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printergroup.py
index 1cc9b1d..2c0a728 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printergroup.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/handlers/shares/printergroup.py
@@ -30,6 +30,8 @@
 # /usr/share/common-licenses/AGPL-3; if not, see
 # <http://www.gnu.org/licenses/>.
 
+import ldap.filter
+
 from univention.admin.layout import Tab, Group
 import univention.admin.uldap
 import univention.admin.syntax
@@ -192,7 +194,7 @@ def _ldap_modlist(self):# check for membership in a quota-printerclass
 				raise univention.admin.uexceptions.leavePrinterGroup(_('%(name)s is member of the following quota printer groups %(groups)s') % {'name': self.info['name'], 'groups': ', '.join(group_cn)})
 		elif self.info.get( 'setQuota', None ) == '1':
 			for member_cn in self.info['groupMember']:
-				member_dn=self.lo.searchDn(filter='(&(objectClass=univentionPrinter)(univentionPrinterSpoolHost=%s)(cn=%s)(univentionPrinterQuotaSupport=1))' % (self.info['spoolHost'][0], member_cn))
+				member_dn=self.lo.searchDn(filter='(&(objectClass=univentionPrinter)(|%s)(cn=%s)(univentionPrinterSpoolHost=%s)(cn=%s)(univentionPrinterQuotaSupport=1))' % (''.join(ldap.filter.filter_format('(univentionPrinterSpoolHost=%s)', [x]) for x in self.info['spoolHost']), ldap.filter.escape_filter_chars(member_cn)))
 				if len(member_dn) < 1:
 					raise univention.admin.uexceptions.leavePrinterGroup, _('%s is disabled for quota support. ') % member_cn
 		if self.hasChanged('groupMember'):
@@ -200,7 +202,7 @@ def _ldap_modlist(self):# check for membership in a quota-printerclass
 		return univention.admin.handlers.simpleLdap._ldap_modlist(self)
 
 	def _ldap_pre_remove(self): # check for last member in printerclass on same spoolhost
-		printergroups=self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(univentionPrinterSpoolHost=%s))' % self.info['spoolHost'])
+		printergroups=self.lo.searchDn(filter='(&(objectClass=univentionPrinterGroup)(|%s))' % ''.join(ldap.filter.filter_format('(univentionPrinterSpoolHost=%s)', [x]) for x in self.info['spoolHost']))
 		rm_attrib=[]
 		for pg_dn in printergroups:
 			member_list=self.lo.search( base=pg_dn, attr=['univentionPrinterGroupMember','cn'])
@@ -218,12 +220,10 @@ def _ldap_pre_remove(self): # check for last member in printerclass on same spoo
 
 	def isValidPrinterObject(self): # check printer on current spoolhost
 		for member in self.info['groupMember']:
-			spoolhosts = '(|'
-			for host in self.info[ 'spoolHost' ]:
-				spoolhosts += "(univentionPrinterSpoolHost=%s)" % host
-			spoolhosts += ')'
 
-			test=self.lo.searchDn(filter='(&(objectClass=univentionPrinter)(cn=%s)%s)' % ( member, spoolhosts ) )
+			spoolhosts = '(|%s)' % ''.join(ldap.filter.filter_format('(univentionPrinterSpoolHost=%s)', [x]) for x in self.info['spoolHost'])
+
+			test=self.lo.searchDn(filter='(&(objectClass=univentionPrinter)(cn=%s)%s)' % (ldap.filter.escape_filter_chars(member), spoolhosts ) )
 			if len(test) < 1:
 				raise univention.admin.uexceptions.notValidPrinter(_('%(name)s is not a valid printer on Spoolhost %(host)s.') % {'name': member, 'host': self.info['spoolHost']})