This is a simple lamp project consisting of a standard lightbulb socket cast into a concrete cube, with the optional addition of a 3D printed lampshade on top.

Materials required:

- Concrete powder: I used Shapecrete, which had clear instructions on the package for mixing and casting and turned out great. This material is really cool because it can have a claylike consistency then harden into concrete, but at the higher water ratio I used to get a pourable consistency, it acts a lot like regular concrete.

- Concrete mixing materials: Cover your workspace in something like a tarp or brown paper to take care of drips, and have a bowl, stirrer and measuring devices ready for mixing, as well as a water source handy.

- Mold making materials: I used foam board, a hot glue gun, a ruler, a triangle, a pen, double sided carpet tape, and a utility knife.

- Lightbulb socket with cord and switch: This is available in hardware stores - make sure you get the kind that has the cord on the switch, not the side of the socket, because the socket will be totally encased in concrete.

- 3D printer and FDM material

Step 1: Make a Mold

The lamp shown here is 3.5" x 3.5" x 2.5", so you'll need to build a rectangular mold with those inside dimensions. Sheets of foam are great for creating a casting mold, because they don't absorb water, demold easily and leave a smooth surface on the face of the concrete. They can be cut easily with a utility blade - use a triangle or measure carefully to make sure the pieces are square, and don't forget to account for material thickness in your dimensions. Stick the panels together with hot glue - it's okay if the joints aren't perfect, any extra concrete that gets in there can be broken off after demolding. I attempted to seal them with hot glue and it just created a melty mess, but if you want a super clean result you could try using silicone or some other sealant.

<p>Great idea and instructable! Can you post (or send PM) the .stl file?</p>
<p>Nice lamp! Another awesome option would be to create your 3D printed lampshade from lithophane photos.</p>
<p>It looks really nice, I really like your project. Never thought of making a translucent lampshade with a 3D printer. Great idea, really.</p>
This actually looks really nice. Did you polish the concrete surface? Because it looks smooth
<p>Almost no air bubbles in the base! Nice work. It's really cool how the pen marks transfer to the piece, I've had that happen too ;) great project and instructable. love the 3d printed shade</p>
<p>This is so cool! I'd love to see a copy of your STL. </p>

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