diff --git a/2021/day22.py b/2021/day22.py
new file mode 100644
index 0000000..edc8a8e
--- /dev/null
+++ b/2021/day22.py
@@ -0,0 +1,24 @@
+with open('day22input', 'r') as file:
+    inputlines = file.read().strip().split('\n')
+
+input_steps = []
+for line in inputlines:
+    state, _, coords = line.partition(' ')
+    coords_str = [token[2:] for token in coords.split(',')]
+    coords = tuple(tuple(int(i) for i in s.partition('..')[::2]) for s in coords_str)
+    input_steps.append((state, coords))
+
+def coord_t_to_cube(tup):
+    (x0,x1), (y0,y1), (z0,z1) = tup
+    return f'translate([{x0},{y0},{z0}]) cube([{x1-x0},{y1-y0},{z1-z0}]);'
+
+scadlist = []
+for onoff, tup in input_steps:
+    operator = {'on':'union()', 'off':'difference()'}[onoff]
+    cube = coord_t_to_cube(tup)
+    scadlist.insert(0, operator+'{')
+    scadlist.append(cube+'}')
+scadstr = '\n'.join(scadlist)
+
+with open('day22.scad', 'w') as file:
+    file.write(scadstr)