LED Mason Jar Lanterns

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Introduction: LED Mason Jar Lanterns

About: Becky Stern is a content creator at Autodesk/Instructables. She has authored hundreds of tutorials about everything from microcontrollers to knitting. Before joining Instructables, Becky worked for MAKE Maga...

In this easy 3D printing project, we'll build glowing mason jar lanterns containing a simple LED and battery circuit. Download my file or build your own custom lid using the Glow Circuit Assembly in Tinkercad, which is designed to hold the battery and LED together perfectly. I'll show you four different ways to style your lanterns using materials you probably already have around.

This is a beginner project that's great for students/educators. Let's begin!

For this project, you will need:

  • Mason jar(s) in size(s) of your choice (quart, pint, 4oz)
  • 10mm LED(s) in color(s) of your choice
  • CR2032 batteries
  • Wire cutters/snips
  • 3D printed lid with embedded Glow Holder in size(s) to match your jar(s)
  • Paper & scissors, glitter glue, translucent beads, etc. for decorating your jar
  • Calipers or a ruler (optional, for designing your own lid)

Make a copy of my Tinkercad file (free account/login required). The two sizes match the common mason jar lid sizes. Export the one(s) that match your jar(s) and send them to your 3D printer. I used Autodesk Print Studio to prepare the printer file and set it to 20% infill with no raft or supports. If you prefer to design your own lid, skip ahead to the design step.

Step 1: Design Your Lid (Optional)

The shape we need to create is a simple cylinder whose diameter matches that of the jar opening. Measure your jar with a ruler or a pair of calipers.

Drag a cylinder into the Tinkercad workplane and adjust its width and depth to match your measurement by clicking the white corner boxes and typing in the new value, using the tab key to hop between different measurements on your shape. Adjust the height of your cylinder to your desired lid thickness. Mine is 1.5mm. Thinner would let more light through but might flex too much over repeated use, and thicker would take longer to print but be stronger if you're thinking of adding more to the project. Round over the sharp edges of your cylinder by adjusting the sliders in the shape inspector.

Navigate to the Circuit Assemblies menu and drag out a Glow Holder. Select both the holder and your cylinder, then select the Align tool. Click both workplane center handles to center-align the two shapes, then click the Group button to merge them into one shape suitable for exporting to your printer software (I use Autodesk Print Studio with my MakerBot Replicator 2). Recommended settings are 20% infill with no raft or supports.

Step 2: Assemble Your Lanterns

To put your mason jar lanterns together, trim the leads of your LEDs (cut the shorter leg first and maintain length disparity) and insert the battery and LED into the holder with the positive side/leg facing the + on the holder (the LED's longer leg is positive). Fit the lid into the mason jar and screw the metal band on to secure.

Step 3: Cut a Paper Jack-o-Lantern

One fun way to decorate your lantern is with paper with cutouts. Cut a strip of paper to match the inside wall of the jar, and a small circle for the bottom of the jar. Strategically fold and cut into the paper strip to create a jack-o-lantern pumpkin face, geometric designs, snowflakes, or whatever strikes your fancy. Use the paper color and the LED color to help further design your lantern. Mine uses white printer paper and red LED, and the lid/holder was printed in transparent PLA.

Step 4: Paint the Inside With Glitter Glue

The idea behind this lantern version is to diffuse the light by coating the glass. You could do this with glass frosting spray or by mod-podging in some faux autumn leaves. I had some glitter glue kicking around my painting supplies to I painted it to coat the inside of a couple jars. The glue dries hazy but clear, leaving the glitter and diffusion layer. The green one evokes some kind of alien slime!

Step 5: Fill It With Translucent Beads

Finally, the quickest way to diffuse the light is to fill the jar with translucent beads, or your collection of sea glass, etc. Again, my mind goes to party decorations when envision the ideal application for this lantern. Baby/bridal shower, kids' birthdays, or a special family meal.

Step 6: Switch It Up & Final Thoughts

The small lid fits inside the bottom of large jars, which can be used to create a more votive vibe. Swap out the 10mm LED for a candle flicker LED to cement that candle feeling. These would make great centerpiece or walkway lights at your next special event.

I'd love to see your mason jar lanterns posted up on this page! Post an "I made it" below, and I'm standing by for your questions and comments.

If you like this project, you may be interested in some of my others:

To keep up with what I'm working on, follow me on YouTube, Instagram, Twitter, Pinterest, and Snapchat.

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2 Questions

Which 3d printer you have used to construct the model of LED holder?

Thanks, I updated the one instance of "lid" that was referring to the metal band. Two different sized lids are offered up to fit the tops of the two most common mason jar sizes. The smaller size coincidentally fits in the bottom of the larger size jar, but to design your own votive holder, any size cylinder that fits through the jar's opening and isn't wider than the bottom of the jar (minus the glass thickness) should work.

what battery would you recommend for this project?

The Glow Assembly uses the CR2032 coincell battery, linked in the materials list.

1 more answer

The Glow Assembly uses the CR2032 coincell battery, linked in the materials list.

4 Comments

It's just as easy to do using cheap dollar store solar LED lights and taking them apart and reconfiguring them to fit the Mason jar lids ! My neighbor has plenty but using wine glasses , very pretty on the patio table at night ! Sorry no photos to back this up

1 reply

It's all about what you have available to you! I would purport that this project tutorial is easier than reconfiguring anything storebought, but hey, only if you have access to a 3D printer or 3D printing service. ¯\_(ツ)_/¯

This looks so easy and fun! I really need to try out the circuits part of Tinkercad :)

1 reply