diff --git a/scripts/exports.py b/scripts/exports.py
index bd34a5e..5d0f114 100644
--- a/scripts/exports.py
+++ b/scripts/exports.py
@@ -28,6 +28,7 @@ from set_config import *
 import time
 import times
 from deps import *
+from tmpdir import *
 import json
 import shutil
 
@@ -65,8 +66,11 @@ def make_parts(target, part_type, parts = None):
     target_dir = top_dir + part_type + 's'
     deps_dir = target_dir + "/deps"
     bom_dir = top_dir + "bom"
+    tmp_dir = mktmpdir(top_dir)
+
     if not os.path.isdir(target_dir):
         os.makedirs(target_dir)
+
     if not os.path.isdir(deps_dir):
         os.makedirs(deps_dir)
 
@@ -131,9 +135,9 @@ def make_parts(target, part_type, parts = None):
                                             #
                                             # make a file to use the module
                                             #
-                                            part_maker_name = part_type + ".scad"
+                                            part_maker_name = tmp_dir + '/' + part_type + ".scad"
                                             with open(part_maker_name, "w") as f:
-                                                f.write("use <%s/%s>\n" % (dir, filename))
+                                                f.write("use <%s/%s>\n" % (reltmp(dir, target), filename))
                                                 f.write("%s();\n" % module);
                                             t = time.time()
                                             openscad.run("-D$bom=1", "-d", dname, "-o", part_file, part_maker_name)
@@ -150,6 +154,10 @@ def make_parts(target, part_type, parts = None):
         with open(bounds_fname, 'w') as outfile:
             json.dump(bounds_map, outfile, indent = 4)
     #
+    # Remove tmp dir
+    #
+    rmtmpdir(tmp_dir)
+    #
     # List the ones we didn't find
     #
     if targets:
diff --git a/scripts/render.py b/scripts/render.py
index 9e35938..4f2926e 100755
--- a/scripts/render.py
+++ b/scripts/render.py
@@ -30,6 +30,7 @@ from tests import do_cmd, update_image, colour_scheme, background
 from deps import mtime
 from colorama import init
 import json
+from tmpdir import *
 
 def usage():
     print("\nusage:\n\trender [target_config] - Render images of the stl and dxf files.");
@@ -40,6 +41,7 @@ def render(target, type):
     # Make the target directory
     #
     top_dir = set_config(target, usage)
+    tmp_dir = mktmpdir(top_dir)
     target_dir = top_dir + type + 's'
     bom_dir = top_dir + 'bom'
     if not os.path.isdir(target_dir):
@@ -80,7 +82,7 @@ def render(target, type):
         # make a file to import the stl
         #
         if mtime(part_file) > mtime(png_name):
-            png_maker_name = "png.scad"
+            png_maker_name = tmp_dir + "/png.scad"
             pp1 = [0, 146/255, 0]
             colour = pp1
             if part in colours:
@@ -88,15 +90,19 @@ def render(target, type):
                 if not '[' in colour:
                     colour = '"' + colour + '"'
             with open(png_maker_name, "w") as f:
-                f.write('color(%s) import("%s");\n' % (colour, part_file))
+                f.write('color(%s) import("%s");\n' % (colour, reltmp(part_file, target)))
             cam = "--camera=0,0,0,70,0,315,500" if type == 'stl' else "--camera=0,0,0,0,0,0,500"
             render = "--preview" if type == 'stl' or colour != pp1 else "--render"
-            tmp_name = 'tmp.png'
+            tmp_name = tmp_dir + '/' + part[:-4] + '.png'
             openscad.run(colour_scheme, "--projection=p", "--imgsize=4096,4096", cam, render, "--autocenter", "--viewall", "-o", tmp_name, png_maker_name);
             do_cmd(("magick "+ tmp_name + " -trim -resize 280x280 -background %s -gravity Center -extent 280x280 -bordercolor %s -border 10 %s"
                     % (background, background, tmp_name)).split())
             update_image(tmp_name, png_name)
             os.remove(png_maker_name)
+    #
+    # Remove tmp dir
+    #
+    rmtmpdir(tmp_dir)
 
 if __name__ == '__main__':
     init()
diff --git a/scripts/tests.py b/scripts/tests.py
index 1f6ea08..677661a 100755
--- a/scripts/tests.py
+++ b/scripts/tests.py
@@ -34,6 +34,7 @@ import shutil
 from deps import *
 from blurb import *
 from colorama import Fore
+from tmpdir import *
 
 w = 4096
 h = w
@@ -94,6 +95,7 @@ def usage():
 
 def tests(tests):
     scad_dir = "tests"
+    tmp_dir = mktmpdir(scad_dir + '/')
     deps_dir = scad_dir + "/deps"
     png_dir  = scad_dir + "/png"
     bom_dir  = scad_dir + "/bom"
@@ -234,7 +236,7 @@ def tests(tests):
             if changed:
                 print(changed)
                 t = time.time()
-                tmp_name = 'tmp.png'
+                tmp_name = tmp_dir + '/tmp.png'
                 openscad.run_list(options.list() + ["-D$bom=2", colour_scheme, "--projection=p", "--imgsize=%d,%d" % (w, h), "--camera=0,0,0,70,0,315,500", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, scad_name]);
                 times.add_time(scad_name, t)
                 do_cmd(["magick", tmp_name, "-trim", "-resize", "1000x600", "-bordercolor", background, "-border", "10", tmp_name])
@@ -303,6 +305,11 @@ def tests(tests):
     with open(doc_base_name + ".html", "wt") as html_file:
         do_cmd(("python -m markdown -x tables " + doc_name).split(), html_file)
     times.print_times()
+    #
+    # Remove tmp dir
+    #
+    rmtmpdir(tmp_dir)
+
     do_cmd(('codespell -L od ' + doc_name).split())
 
 if __name__ == '__main__':
diff --git a/scripts/tmpdir.py b/scripts/tmpdir.py
new file mode 100644
index 0000000..f19681d
--- /dev/null
+++ b/scripts/tmpdir.py
@@ -0,0 +1,40 @@
+#
+# NopSCADlib Copyright Chris Palmer 2021
+# nop.head@gmail.com
+# hydraraptor.blogspot.com
+#
+# This file is part of NopSCADlib.
+#
+# NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+# GNU General Public License as published by the Free Software Foundation, either version 3 of
+# the License, or (at your option) any later version.
+#
+# NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with NopSCADlib.
+# If not, see <https://www.gnu.org/licenses/>.
+#
+"""
+Make a directory for tmp files.
+"""
+import os
+import time
+
+def mktmpdir(top_dir):
+    tmp_dir = top_dir + 'tmp'
+    if not os.path.isdir(tmp_dir):
+        os.makedirs(tmp_dir)
+    else:
+        for file in os.listdir(tmp_dir):
+            os.remove(tmp_dir + '/' + file)
+    return tmp_dir
+
+def reltmp(dir, target):
+    return dir if os.path.isabs(dir) else '../../' + dir if target else '../' + dir
+
+def rmtmpdir(tmp_dir):
+    os.rmdir(tmp_dir)
+    while os.path.isdir(tmp_dir):
+        time.sleep(0.1)
diff --git a/scripts/views.py b/scripts/views.py
index 91080a9..c5dbaf7 100755
--- a/scripts/views.py
+++ b/scripts/views.py
@@ -38,6 +38,7 @@ import shutil
 import re
 import copy
 from colorama import Fore
+from tmpdir import *
 
 def is_assembly(s):
     return s[-9:] == '_assembly' or s[-11:] == '_assemblies'
@@ -129,6 +130,7 @@ def views(target, do_assemblies = None):
     # Make the target directory
     #
     top_dir = set_config(target, usage)
+    tmp_dir = mktmpdir(top_dir)
     target_dir = top_dir + 'assemblies'
     deps_dir = target_dir + "/deps"
     bom_dir = top_dir + "bom"
@@ -204,15 +206,15 @@ def views(target, do_assemblies = None):
                                             changed = check_deps(png_name, dname)
                                             changed = times.check_have_time(changed, png_name)
                                             changed = options.have_changed(changed, png_name)
-                                            tmp_name = 'tmp.png'
+                                            tmp_name = tmp_dir + '/' + real_name + '.png'
                                             if changed:
                                                 print(changed)
                                                 #
                                                 # make a file to use the module
                                                 #
-                                                png_maker_name = 'png.scad'
+                                                png_maker_name = tmp_dir + '/png.scad'
                                                 with open(png_maker_name, "w") as f:
-                                                    f.write("use <%s/%s>\n" % (dir, filename))
+                                                    f.write("use <%s/%s>\n" % (reltmp(dir, target), filename))
                                                     f.write("%s();\n" % module);
                                                 t = time.time()
                                                 target_def = ['-D$target="%s"' % target] if target else []
@@ -439,6 +441,10 @@ def views(target, do_assemblies = None):
                 dst.write(line)
                 i += 1
     #
+    # Remove tmp dir
+    #
+    rmtmpdir(tmp_dir)
+    #
     # Spell check
     #
     do_cmd(('codespell -L od ' + top_dir + 'readme.md').split())