About: Graduated as a product designer in the Spanish city of Barcelona in 2017. Since one month before graduation, I started working as a team co-manager of BCN3D Technologies, a company from the 3D printing s...


ORBITA is a Project which creates a modular piece made out of plastic waste by using a manual plastic injection machine, to make home furniture. Empowering a workshop in collaboration with Taller Esfèrica. Which its aim is to cause a new mental change in to the youngest generations, approaching them to a responsible consume, making understand the new position of the consumer as a maker of the products itself, breaking with the classic industry, and understanding the value of his waste products.

Step 1: Mold Design

First of all 3D model the mold.

Step 2: CNC Milling

CNC mill the mold in beech wood or in harder woods. Make it in aluminium if you have enough money. If you do not have CNC you can access the services of FABLABs or CNC milling companies.

Step 3: Hand Sanding and Smooth Surfaces

Once the mold has been completely milled, we will sand it gently with 1000 or 2000 sandpaper getting it ready for injection avoiding rough surfaces.

Step 4: The Legs

In parallel we will have cut our plank of wood that will make us of on of the table, stool or chair that we want to make. We will also have cut the square profile slats that will be the legs and we will have made some cavities to let the melted plastic go in when injecting and be well joined.

Step 5: Assemble the Mold

With all the components ready, we will proceed to assemble the mold. We will use the metric screws that will join all the parts and enclosing the leg inside of the mold to let the plastic wrap it.

Step 6: Soap Demolding

Before closing the mold completely and making it airtight for the injection of plastic, we will apply the whole interior with a thin layer of dish soap to avoid the adherence of the plastic to wood pores.

Step 7: Close the Mold

Once properly soaped, we will close it tightly with the metric screws. You will be ready for the injection.

Step 8: Shredding Plastic

Now it is time to shredd the bottle caps or reusable party glasses (made out of Polypropylene) and get the plastic grain ready to inject as our raw material.

Step 9: First Steps in Plastic Injection Machine

Once obtained the plastic chips, we will introduce it in the plastic injection machine. We will have to heat it up at 180ºC for 20 minutes. It is at this time where we can mix different colors of plastics to give to the final piece a cool aesthetics to our final piece. i have choosen transparent with a big load of red resulting in a unsaturated red.

Step 10: Mold Loaded Inside the Machine

Having already the plastic at the right temperature, after 20 minutes, you are ready for the injection. We will put the mold that we had previously assembled and inject by pressing the lever until we notice that the mold is filled to the maximum and doen't allow us to fill it anymore.

Step 11: Waiting for Cooling

Once injected, wait for the plastic inside to cool.

Step 12: Unmolding

Once cold, we will proceed to the extraction of the piece, which will have been embedded in the leg.

Step 13: Repeat, Repeat and Repeat

Repeat the process as many times as needed to obtain the desired number of legs with their respective pieces.

Step 14: Legs Assembly

Before finishing we will proceed to the assembly of the legs using some self-tapping wood screws and the drill.

Step 15: The Piece!

Finally we will have our piece. In this case a stool.

Step 16: READY!

Ready to be used whenever you want! :)

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    14 Discussions


    9 days ago

    Very nice instructable! A good mixture of visuals and text.

    Wish andG

    11 days ago

    This is awesome simple and neat


    17 days ago

    I love how simple and functional this is! The plastic pieces make it look so modern. :)

    1 reply

    18 days ago

    This is really neat!!

    I would LOVE to hear more about your plastic injection machine - did you make it?

    6 replies

    Reply 17 days ago

    I just looked at the Precious Plastic site for the injector. They have plans and a video showing how to make it. There is lots of welding that could be done in wood or PVC if you ask me. Basically it is a large hot glue machine that starts with HDPE chips and ends with a stream of hot goo. This device could revolutionize the small scale recycling of HDPE.


    Reply 16 days ago

    Oh wow! As much simple as possible is always better than use tons of energy in welding. It could be super cool to develop an injection machine out of wood with simple joinery using screws. I hope you go for it. It would be awesome!


    Reply 18 days ago

    Thank you so much. Trying to design something else with it. Actually the machine it's not mine, but anyway the construction design and the blueprints are taken from the opensource project precious plastic. If you don't know it you should check it out. It is awesome!



    18 days ago

    If you liked check more ideas and projects in my intagram profile @yoelcruzdesign


    Tip 18 days ago

    You should take your injections a step further and put an imprint of the type of plastic on the mold, so you know what it is when you want to recycle it later down the road (or someone else finds it and wants to recycle it).

    Great idea. I'd love to see an instructable about the plastic injector.

    1 reply

    Reply 18 days ago

    Totally agree! It is a nice idea. Now I am working on a heated stamping tool to put the kind of plastic that the legs are made out. Thank you so much for your suggestion :D