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A 3D printed postcard for single use, ready with syrup water and an embedded stick.

The “Ice-Pop” postcard functions as a popsicle mold, and when the happy receipient gets it, they simply need to put it in the refrigerator to make it pop out!

This instructable depicts one item from my project “Post Postcard”, in which I’ve tried to question a few assumptions:

The first comes from the fact that I am the owner of the production tool and materials. How can I use my 3D printer in a way that outsource services can’t?

The second challenge comes from the fact that 3D prints are watertight. This is a well known fact, but what can be done with it (other than vases)? In this popsicle postcard I also make use of water anomalies: by placing it in the fridge the water freeze, therefore expanding and breaking the mold/postcard.

Last but not least, what are things that I can literally mail? What items can I make, then stamp and put in the post?

This is an ongoing project, which has already been exhibited in Jerusalem and Tel Aviv and I’m happy to share its concept and how-to.

***Please note that the end result is non-edible unless all the mentioned materials (filaments, resins) are food safe.

Step 1: Ingredients & Files

In the making of the Post Postcard project I’ve typically used two PLA filaments, one clear and the other pigmented, but in this tutorial I’ll demonstrate all steps with a single, clear filament. As mentioned before, if you’d really like to make it for more than just fun and to actually eat the result you must use food safe filaments and resins. A general summary of food safe 3D printing can be found in this link.


The software I used is Matter Control which makes it possible to pause a print, change the position of the Z axis, change filaments and resume to a pause point – a function that is a must-have in this project.

The printer used is a Printrbot simple metal model, which has the most critical feature for this project – the option to mess with the print and to to insert items during printing :)

Having said that, I’m certain there are more options for filaments (ABS), slicing software and 3D printers. This is all based on my personal experience and I’ll be more than happy to hear alternative solutions and methods for doing it.

Ingredient list:

1.75mm Transparent filament

Syrup Water, choose your favorite flavor (I've used strawberry as it give nice contrast :) About 100ml. (one glass).

Clear, quick drying epoxy resin (I've used the XTC-3D by Smooth-On)

Syringe + Needle, 10ml

Popsicle Sticks

Small Paint Brushes - 5 units

The needed files are:

Kartiv 3-1 - The .stl file for the printing.

Ice Pop - Back Side - The .pdf file for the printed side.

Bravo. Outside the box thinking.
<p>Thanks. </p>
I would use a plastic stick so the liquid won't wick up in the wood
<p>Great solution, I hadn't thought about it, a printed plastic stick?</p>
<p> I am intrigued by the idea and if I ever have access to a 3d printer will definitely try it. Do you have a picture of it after freezing?</p>
<p>Thanks, not yet, but soon will!</p>
Amazing concept. Well done, thanks for sharing your idea
<p>Thanks!</p>

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