diff --git a/localsettingspotatohut.py b/localsettingspotatohut.py
index 5346415..976e61a 100644
--- a/localsettingspotatohut.py
+++ b/localsettingspotatohut.py
@@ -24,6 +24,7 @@ FIX_PERMISSIONS = ["sudo", "/usr/local/bin/fix_permissions"]
 
 SURVEX_DATA = REPOS_ROOT_PATH + 'loser/'
 TUNNEL_DATA = REPOS_ROOT_PATH + 'tunneldata/'
+THREEDCACHEDIR = REPOS_ROOT_PATH + 'expowebcache/3d/'
 
 CAVERN = 'cavern'
 THREEDTOPOS = '3dtopos'
diff --git a/localsettingsserver.py b/localsettingsserver.py
index b0cd49d..1d8fbe7 100644
--- a/localsettingsserver.py
+++ b/localsettingsserver.py
@@ -26,6 +26,7 @@ PUBLIC_SITE = True
 
 SURVEX_DATA = REPOS_ROOT_PATH + 'loser/'
 TUNNEL_DATA = REPOS_ROOT_PATH + 'tunneldata/'
+THREEDCACHEDIR = REPOS_ROOT_PATH + 'expowebcache/3d/'
 
 CAVERN = 'cavern'
 THREEDTOPOS = '3dtopos'
diff --git a/localsettingsubuntu.py b/localsettingsubuntu.py
index c50a374..3ae475d 100644
--- a/localsettingsubuntu.py
+++ b/localsettingsubuntu.py
@@ -25,6 +25,7 @@ PUBLIC_SITE = False
 
 SURVEX_DATA = REPOS_ROOT_PATH + 'loser/'
 TUNNEL_DATA = REPOS_ROOT_PATH + 'tunneldata/'
+THREEDCACHEDIR = REPOS_ROOT_PATH + 'expowebcache/3d/'
 
 CAVERN = 'cavern'
 THREEDTOPOS = '3dtopos'