Anemone Tentacle Mk1 (Arduino YÚN Case)

by Inza, published

Anemone Tentacle Mk1 (Arduino YÚN Case) by Inza Oct 31, 2016

Educational Thing


Anemone Tentacle is a 3D printable case for Arduino YÚN and Arduino TFT Display.

It is part of the open and free #anemoneCloud Platform, but it can be used completely standalone as well.

When used inside the Anemone Platform the Tentacle could be used as a DYI Open Hardware device where user can load one of the available anemone apps or create his own.

When used outside the Anemone Platform it can be used as a cute case for your Arduino YÚN and Arduino TFT Display.

Tentacle features one top button, one front button and side place for the Rotary Encoder KY-040 with a knob.

Detailed instructions how to assemble the Tentacle electronic circuits are available as well.

I am not the sole author of this thing or of the Anemone Project. Anemone Tentacle has been created as a team effort of our great team at Juicymo and our client. See more info about who is behind this here.

Tentacle Visualization can be found at YouTube


Print Settings

Printer Brand:



Prusa i3 MK2 Original






ABS 0.35mm (first layer 0.15mm)


15% Honeycomb


The Anemone Tentacle 3D case is available either as .stl files of 9 individual components:

  • The Bottom Part
  • The Walls
  • The Top Button
  • The Top Button Lodge
  • The Top Button Lever
  • The Menu Knob Cover
  • The Front Button
  • The Top (LEGO® compatible) cover
  • The Front Display Frame

Or as three ready-to-print .stl files with all components assigned into three groups (with slightly different print settings) :

  1. Bottom and Insides
  2. Walls
  3. Top and Display covers

In addition to the .stl ready-to-print file for every print group you can download a exported gcode files for the Prusa i3 MK2 3D Printer with ABS filament setting. We have use these gcode files to print our version of Anemone Tentacle on Kanárek (Prusa i3 MK2 Original 3D Printer).

Print Group 1 - Bottom and Insides

The first print group consists of case bottom part, internal components and all knobs and buttons.

Print Group 2 - Walls

The second print group is the case walls.

Print Group 3 - Top and Display covers

The last print group contains the top LEGO® compatible cover piece and display frame cover.

Recommended print settings

The Anemone Tentacle case is optimized to be printed in ABS (but theoretically should print well with PLA too).

We have used the Slic3r for slicing the .stl files into .gcode.

Anemone Tentacle case looks awesome even on low print settings - which looks nice with a semi-transparent filament.

Global settings

  • Filament: ABS 1.75mm
  • Extruder Temperature: 255°C
  • Heat-bed Temperature: 100°C
  • Layer height: 0.35mm
  • First layer height: 0.15mm
  • Perimeters: 1
  • Infill density: 15%
  • Infill pattern: Honeycomb
  • Skirt: 1
  • Brim: 0mm
  • Support: No

Detailed settings

Detailed settings are slightly different for each of the three recommended print groups (only the attributes different from the global settings are shown):

  1. Bottom and Insides
    • Infill density: 20%
    • Perimeters: 1
    • Brim: 0mm
    • Support: Yes
    • Support Pattern: Rectilinear
  2. Walls
    • Infill density: 15%
    • Perimeters: 1
    • Brim: 5mm
    • Support: Yes
    • Support Pattern: Pillars
  3. Top and Display covers
    • Infill density: 20%
    • Perimeters: 2
    • Brim: 0mm
    • Support: No

Tips and Tricks

  • When printing with ABS you HAVE TO to use the heated bed!
  • The second print group (The Walls) needs to have brim which helps the print to stay connected to bed and not bend while printing (we use 5mm).
  • The second print group (The Walls) needs to be printed with supports (we recommend pillars type if you use Slic3r).
  • Best infill type is Honeycomb with 15% density for The Walls part which even helps to achieve the nice light reflecting effects with a semi-transparent filament.


After printing the second print group (The Walls) needs to be cleaned of supports.

When done you can try to assemble the Anemone Tentacle case.

See the following video.

How I Designed This

The Anemone IoT Platform Story

The original idea for Anemone was to create a simple Open Hardware device which would be able to send information to the cloud (or internet) and which will be very easy to use for others.

Over time, the idea expanded a little. And we have ended up creating not just the Open Hardware device itself (we call it a Tentacle) but 3D printable case, cloud web application and even mobile application as well.

And now we in fact have a quite nice ecosystem. Not with many apps right now, but it is ready to use! And that is where we need your help ;)

With Anemone, you can create a cloud enabled IoT apps in a very easy way and get them hosted for free in the Anemone Cloud. Or you can just print the Tentacle Case and upload a picture of it to the I made it section. Our Anemone Tentacle case is the very first 3D printed case connecting Arduino YÚN and Arduino TFT LCD Display together. And you can use it freely even completely outside the Anemone platform too.

So enjoy! ;)


Overview and Background

This lesson can be used as a semestral work for any subject featuring electronics, soldering and 3D printing.

Lesson Plan and Activity

How to print

A detailed tutorial how to print Anemone Tentacle is available.

How to build

A detailed tutorial how to build Anemone Tentacle is available.

Platform Overview

An Anemone Platform Overview document is available.


A FAQ with many answers regarding the project is available.

Materials Needed


Anemone Tentacle case is best printed from the semi-transparent EasyABS filament. But any ABS will work without problem.

In theory PLA filament should work as well, but the model is optimized for ABS (the hole for the rotary encoder of the right side of The Walls .stl file is designed as oval which looks like a circle after printing from ABS).

Electonics Components

In order to make your life easier we have prepared a list of links where you can buy all the Tentacle parts:

This is just a hint ;). All the parts are Open Hardware you can buy them in your favorite shop, local hardware store, etc. Links is this table are just our suggestion.

# Part Where to buy Cost
1x Arduino YÚN https://goo.gl/zxKTJE €68.20
1x Arduino TFT LCD Display https://goo.gl/QMAZtW €20.90
1x Rotary Encoder KY-040 https://goo.gl/aWtrAF €0.50
1x Buzzer YL-44 https://goo.gl/2WzGYW €0.43
1x Microswitch TC-0108-T https://goo.gl/iff8Z7 €0.13
1x Red Switch P-PB303B https://goo.gl/SXAANZ €0.45
2x Green Super Flux LED 913PG2C https://goo.gl/xWg07e €0.40
2x Optocoupler BPC-817C https://goo.gl/BFo84T €0.30
2x Resistor 220 Ohm - -
2x Resistor 10 Kiloohm - -
1x Prototype Shield with Small Breadboard https://goo.gl/QiYypK €1.00
1x Stripboard Single Side PCB 5x7cm https://goo.gl/bP6dKk €1.26
1x RJ-11 Connector Box WEBP 6-4 LP 833-045 https://goo.gl/kE05f0 €0.25
1x Insulated wire on coil 0,4mm/25m Blue https://goo.gl/lk7bCX €2.20
1x Breadboard Connectors PROSKIT OP-E351 https://goo.gl/8ECFLD €12.29
1x Female Headers Row 40 https://goo.gl/bsTJQJ €0.34
1x Male Headers Row 20 Straight https://goo.gl/MwZm9u €0.23
1x Male Headers Row 20 90-deg https://goo.gl/N3jrON €0.34
1x Jumper Cables M-M, M-F, F-F, 40pcs, 10cm https://goo.gl/9HJ0Yd €3.45
1x Jumper Cables M-M, M-F, F-F, 40pcs, 20cm https://goo.gl/QxP5vw €2.17
Total €114.84

Skills Learned

  • Soldering
  • Electronics
  • Programming

Duration of Lesson

4 hours preparation + 10 hours 3D printing + 4 hours assembly = 18 hours


In order to 3D print the Tentacle case you need the following:

  • a 3D printer (ABS compatible = with heated bed)
  • a ABS filament

In theory, you should be able to print the case with PLA filament as well, but we have not tested that.

In order to assemble a working Tentacle you need the following:

  • a 3D printed case
  • all the electronical parts (see the tentacle parts list)
  • a free account on the Anemone Cloud open platform (in case you want to use your Tentacle within the Anemone Platform, you can create your account here)

Rubric and Assessment

Anemone Tentacle can be used in a tasks like "Creation of a cloud enabled Open Hardware Device".

An example assessment for students could be:

Your task is to create a working Anemone Tentacle open hardware device. Your task is the following:

  1. 3D print a Tentacle case (a detailed tutorial is available)
  2. Assemble the Tentacle electronic circuits (a detailed tutorial is available)
  3. Install the required Open Source software (a detailed instructions are available)

The student assessment is a success when:

A. (the easier variant) Students were able to construct a working Anemone Tentacle device and they were able to install the software on it and they were able to install the default example Anemone App called JuicyDay using OTA (over-the-air) update.
B. (the harder, more complex, variant) Students were able to construct a working Anemone Tentacle device and they were able to install their own Anemone application to it using OTA (over-the-air) update.

Students should work in teams of two.


Custom Section


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