SMARS modular robot

by tristomietitoredeituit, published

SMARS modular robot by tristomietitoredeituit Nov 22, 2017


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SMARS acronym of “Screwless/Screwed Modular Assemblable Robotic System” is a simple robot designed to the educational field. The main features of SMARS are the reduced number of components, the possibility of mount it without screws and without soldering any part, it doesn’t need glue or similar and it’s really cheap to build. Another main point of SMARS is the modular design. You can mount different sensors and tools and design your own parts. In future I’ll add new modules or DLC to improve the model on my Cults 3D page (https://goo.gl/xK9s1V) but It would be nice if you could share your mods too.

Join the Facebook group! https://goo.gl/4EgJhX
Facebook page: https://goo.gl/Gcmxp5

To build the basic model (with “chassis -SL.stl”) you just need few extra components:
-2x mini 150RPM motors https://goo.gl/FK7nvk
-1x 9[V] battery (you can find it in a local shop)
-1x 9[V] battery connector https://goo.gl/P5gYos
 or https://goo.gl/F1wWUd
-1x Arduino UNO or 2009 https://goo.gl/6nCCMZ
 or https://goo.gl/gNpttN
-1x Adafruit Motor Shield V1 or V2 https://goo.gl/n9rXvW
or an L298P motor shield https://goo.gl/aHG2z7

For the screwed version ( “chassis -S.stl”) you just need two 25mm M4 screws and two self locking nuts.

The joints of the tracks are simply pieces of 1.75mm filament cutted at the right length.

To assemble the screwless version you will need a multi slip-joint gripping plier to insert the “slave wheels”.

One of the next DLC will be the Quadpod mod. if you are interessted to move from tracks to legs, use the screwed version “chassis-S.stl” (“chassis-SL” will not be compatible)!

Building instructions are in the "doc lite" folder.

These models fits also:
-3x AAA batteries (check on my profile for the DLC)
-1x PS3 controller 1800mAh 3.7V Li-Ion Battery (be careful and use it only if you
know what you are doing!) https://goo.gl/AR6pjf

Print Settings


BQ Witbox










only the "chassis_SL" needs supports (touching building plate)

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Ive printed all the parts and very impressed with how its turned out thank you.

However the tracks seem too tight causing to much friction for the motors to turn them. Whats the best way to free them up a bit?

Hi and you're welcome. The tracks are directionals, have you tried to rotate them of 180°? Otherwise I suggest to scale them with Cura or other softwares and print again one segment or more

This is really outstanding. Thank you for doing this. I cant wait to build one!

Thank you and your welcome. Join us in the Facebook group to be updated and share your ideas!

Hi! this project looks so professional! even the documentations looks like a lego kit :)

Is your Idea to upload the cad files? Are there available somewere?


Hi! Thanks, usually I don't spend much time in the documentation but this time I tried to do my best. The source files are available here on Thingiverse, they are in the "source_files.zip" folder. I designed all the parts with Cubify Design, the file format is odd and I don't know if other CAD softwares could open it. Let me know and have a nice Christmas!

can you upload the pen holder & the shovel models please??
thank you in advance.

Hi, I just uploaded the shovel, unfortunately I can't upload the drawing tool because it's not a free model.

Hi, I couldn't fine the shovel STL file!!!
could you tell me where can I find it please??
thank you in advance..

Can you post an example of the software you wrote to operate SMARS

Hi, the examples are in the doc_lite.zip folder

Could you share any video, or how to program it?

I'll try to record something this weekend. For the programming, you just have to download Arduino IDE software from https://www.arduino.cc/ , open a new sketch and paste there the content of one of the demo files in the doc_lite folder. in the sketches there are some explications about what the code does. There are a lot of examples online, you just have to see where are connected the sensors and install the right libraries