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Here is a little 'ible on how to make your own wax seal stamp!

Step 1: What You Need

Pasta machine
Sugru
Pen
Linoleum block print cutter (make your own here, it's the last 3 steps)
Wooden block for a handle
Sealing Wax (make your own here)
stamping ink *optional*
Aluminum foil

Step 2: Sandwich the Sugru

Mix up your Sugru, flatten it into a pancake, and sandwich it between aluminum foil.

Step 3: Pasta Machine

Put the Sugru-foil sandwich through a pasta machine with the gap set to about 3 or 4 mm

Step 4: Peel It

After putting the Sugru through the pasta machine a few times to make sure it's flat and consistent, wait 1 hour (so it can cool to room temp and be less sticky. If you want, you can put it in the fridge but DO NOT FREEZE IT).

After that, you should be able to pull one side of the aluminum foil off the Sugru. You need to expose one side to the air so the Sugru can dry.

Now that one side it exposed to the air, let the Sugru dry for 24 hours.

Step 5: Peel It Again

After the Sugru dries, peel the aluminum foil off the other side. Be very careful not to tear anything!

Step 6: Making the Handle

Glue a block of wood to the Sugru-pancake, and then trim the excess Sugru off.

Step 7: Carving

Draw out your design on the Sugru, remember that it will be reversed when you stamp it. After that, use a linoleum block print cutter to carve out your design.
If you don't have a linoleum cutter, you can learn how to make one here (the last 3 steps)

Step 8: Final Product and Uses

All done! You can use your new stamp for two different things: You can stamp it into seal wax, or you can use it just like a rubber stamp!

Use it to authenticate letters, documents, or whatever you can imagine!