How to Make a Signet Ring and Seal Your Envelopes in Style




Introduction: How to Make a Signet Ring and Seal Your Envelopes in Style

Nothing is more embarrassing than getting to the end of a letter and realizing that you don't have a good wax seal for the envelope.  With a couple of easy steps, a 3d printer, a kiln, and a spin caster, you can have a signet ring in no time.

Submitted by Milwaukee Makerspace for the Instructables Sponsorship Program

Step 1: Design the Ring

Using Sketchup or openScad, or your favorite cad design program design a ring.  Below is a question block ring I designed using Sketchup.  Also attached is an openScad ring designer I am working on.  Whatever you want to design is up to you.

If you use Sketchup, there is a variety of plugins you can get to take your design from .skp to .stl.  I found one from the makerbot website, and it worked great.

Step 2: Print the Ring

I used a makerbot replicator to print out the rings.  From stl file to print is as easy as opening the stl in replicatorG.  From there to SD card, it was easy enough to get the printer going.  I printed these rings in ABS plastic.

Step 3: Pack the Ring in Investment

After you have your companion cube ring printed out, the next step is to put it on a wax sprue and then mix the investment and pour it over the ring.  Unfortunately, I forgot to take a picture of this step, and all I could find was a picture of the side of the cylinder.  Inside this cylinder is a ring suspended on a wax stick.  I then mixed the investment plaster and poured it over the ring.  This dries overnight and sets up inside the cylinder.

Step 4: The Burnout and the Cast

Some guys from Makerbot came by the Milwaukee Makerspace and told us that ABS burns out quite cleanly.  Since I assumed that ABS and wax are basically the same burnout profiles, I followed the same burnout for wax using the Kiln at my local makerspace.  Follow whatever Temperature profile is your favorite, and burnout the abs ring from the investment.

After the Burnout, when the mold is at casting temp, I put the mold into the spin caster at my local makerspace, melted the bronze grain in the crucible and started the caster spinning.  

After the metal cooled down enough, I dropped the mold into water and watched as the water boiled with the sudden infusion of a mold and metal being quenched.

Step 5: Cleanup

After the rings come out of the mold, they are still attached to the tree that was supporting them in the mold.  This is now made out of bronze, since the plastic melted out leaving a space in the mold which was filled with molten bronze.  The First step is to cut the rings off of this tree and start filing, and cleaning until the plaster is all gone and any imperfections created in the casting process are gone.  I didn't get any good before shots of the rings, but my favorite cleaning method for things that have been cast is to soak them in Coca-Cola overnight, and then brush them with an old toothbrush.  The best before-after shot I have of this method is on a Bronze Han that I made a while ago.  The pictures are from slightly different angles, but they are the same Han frozen in Bronze.

Step 6: The Letter and the Seal

The only thing left to do is to write a letter to a princess that is trapped in another castle, seal it with your brand new signet ring and put it in the mailbox.  

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    10 Discussions

    Have you tried doing this without the casting? You inspired me to make a a simple version. ABS doesn't soften until ~212F, and paraffin melts <195F,

    Sounds like they can be friends! It might not last as long (longer if I chill the ring before hand)...but I can always reprint :). Until the day I get access to a beautiful kiln.

    This article is like "how to draw owl" instruction:
    1)draw some circles
    2) draw the rest of the f*** owl

    One thing that I do know is when you are making this, if you want it to fit on your finger then you need to allow for some shrinkage. The metal, from when it solidifies to when it hits room temperature will shrink by a percentage (I'm not sure by how much, probably depends on the metal).

    What would the approximate cost be if you skipped everything after the CAD design and sent it somewhere like Shapeways?

    1 reply

    I uploaded a similar ring to shapeways and it was around 30 bucks for steel or 70 for silver. I don't know if it is print-able though, because I didn't ensure that the tolerances matched for the material specs from shapeways.

    this is completely awesome, ive wanted to make a signet ring for the last 5 or 6 years, and finally decided i was going to go to a jewelers and have one made of silver. i have yet to go to the jewelers and so but but this makes me want to even more.

    I live in madison, so it was nice to see your in milwaukee ;P

    I just wish i had access to all the things you do and the insperation to do it this way, ive bin thinking about a few other cheap ways to cast one, AWESOME instructable. THANK YOU!

    1 reply

    Thanks for the comments. Glad to hear you liked it. If you are looking for a great place with lots of equipment and people that know how to use them, you should look into Sector 67. I've not been, but they are the makerspace in Madison. Also, if you look into , you could design the ring in a cad program and have them make it in silver, steel, or plastic for you.

    This is super cool. I like it because it is not just RETRO... it is PRE-retro ! Makes me want to get out my quill-pen and send someone a REAL LETTER... not some lame old email. great instructable !