Mushroom USB LED light

Mushroom USB LED light

Electronics, Gadgets, Laptop

3D model of a mushroom lighter

A 3D model of a small mushroom as a USB lighter for the desk. The head of the mushroom has been 3D printed with glow in the dark filament, saving the light energy and continue glowing and after the switching-off.

Free 3D model of a mushroom lighter for 3D printing
3D model of a mushroom lighter for 3D printing

The only thing that you have to do is to find an old USB cable, cut it and find the red and the black cables. You can use a simple LED just connecting the positive with the red and the negative with the black. A low resistor could be needed so not to burn out the LED. But generally, it is a very simple procedure.

Free 3D model of a mushroom lighter for 3D printing
3D model of a mushroom lighter for 3D printing
Free 3D model of a mushroom lighter for 3D printing
Rendered 3D model of a mushroom lighter for 3D printing


THE HEAD

Supports or rafts

This part does not need supports or rafts. The last layers of the object have been designed as a bridge and not as a dome. Also, the bridge is inside and therefore there is no point to waste material.

Perimeters

Use of three lines perimeter.

Layer Height

Low layer height, i.e. 0.1 mm. It affects mostly the last layers, which is the bottom of the model. A higher layer can be used, but it will not make a nice bottom surface (or top during 3D printing). However, because the object is placed upside down, you will not be able to notice this detail.

Printing speed

High printing speed, with low to medium gap speed. However, the high speed can create perpendicular stripes on the object due to the vibrations.

Travel speed

High.

 

THE BODY

Supports or rafts

This part does not need supports or rafts.

Perimeters

Use of three lines perimeter.

Layer Height

High.

Printing speed

High.

Travel speed

High.

 

 

DOWNLOAD DESIGN: LINK
(1X) SMALL LED
(1X) SIMPLE USB CABLE
(1X) GLOW IN THE DARK FILAMENT


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Universal laptop cooler with stand

Universal laptop cooler with stand

Electronics, Favourite projects, Gadgets, Laptop

3D model of universal laptop cooler with stand for 3D printing

Instead of buying cheap or expensive laptop coolers that you are not sure if they match with your laptop, you can 3D print and build our propose gadget of a universal cooling pad extracting the hot air from your laptop. The mini vacuum made by three fans of 25X25X10mm size extracting the hot air directly from your laptops’ GPU and CPU. Also, the stand is made at an angle of 15 degrees reducing the temperature by just letting the hot air under your laptop to be recycled. Despite the ergonomic stand, the proposed cooler is much smaller than the common commercial vacuum USB coolers and more effective.

Free 3D model of a universal laptop cooler with stand
3D printed universal laptop cooler with stand

The assembly of the laptop cooler is very easy. Just 3D print the models that you can find at the end of the post with the suggested printing settings. Also, if you deal any trouble with the cup of the fans, a scaled part at 99% is included. Use of 2.5mm or 3mm bolts with 15mm length. In the above photo, 2.5mm bolts have been used. Find a USB cable, even an old one, cut it at the right size and find the red and black cables. Make a simple connection of all the red cables and all the black cables respectively and you are ready. Don’t forget to make a knob or just use a plastic strap to secure the cable not to go off. The only disadvantage of this proposed 3D printed product is that it makes noise due to the low-cost fans. However, it can be used in conjunction with our proposed design product laptop stand. Don’t let your laptop burning when it handles heavy computational lifts!

Free 3D model of a universal laptop cooler with stand
The connection of the universal laptop cooler.

FOR aLL PARTS

Supports or rafts

This part does not need supports or rafts.

Perimeters

Use of three lines perimeter.

Layer Height

High.

Printing speed

High.

Travel speed

High.

DOWNLOAD DESIGN: LINK
(1X) PLA FILAMENT
(1X) SIMPLE USB CABLE
(3X) 25x25x10 mm Fan 5V
(12X) BOLTS 3MMX15MM or 2.5MMX15MM
(12X) NUTS 3MM (OPTIONAL)


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Arduino Uno case

Arduino Uno case

Electronics, Gadgets

3D model of an Arduino case

Sometimes you want to have your Arduino protected but also an easy access. This case fits Arduino Uno and has an easy open/close cap.

3D model of an Arduino Uno case for 3D printing
3D printed Arduino Uno case with an easy open/close clap

Supports or rafts

This part does not need supports or rafts.

Perimeters

Use of  three lines perimeter.

Layer Height

High.

Printing speed

High printing speed but low bridge speed.

Travel speed

High.

Download Design: Link
(1x) PLA filament


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IMU holder for MoCap

IMU holder for MoCap

Electronics, Gadgets

3D printed IMU holder for MoCap

Motion capture (MoCap) is the system that records the movement of a person. The holders including an IMU are attached to a person’s lower or upper extremities. Flexible materials are recommended for the straps and PLA for the rest of the parts. The STL files contain holder for different types of IMUs: mpu 60509150 / MMA845X / MAX21100. Short and long straps are included.

Free 3D models of IMU holder
3D printed IMU holder for MoCap systems
Free 3D models of IMU holder
3D printed IMU holder of a MoCap system

 

Supports or rafts

Thiese parts do not need supports or rafts.

Perimeters

Use of three lines perimeter.

Layer Height

High.

Printing speed

High.

Travel speed

High.

Download Design: Link
(1x) PLA filament
(1x) Flexible filament
(1x) IMU MPU-6050 / 9150 / MMA845X / MAX21100
Check also:
IMU motion detection


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3D printed force/pressure sensors

3D printed force/pressure sensors

Electronics, Favourite projects, Gadgets, Popular posts

Make low cost 3D printed sensors

Recently, advanced conductive materials have been presented for the 3D printing of electrical circuits. These new types of materials have extended the possibilities of 3D printing. A low-cost conductive filament with high resistivity can be used for various low-voltage applications such as force/pressure sensors. When pressure is applied, the contact area between the two conductive materials is increasing and the total resistance is decreasing (Fig 1).

 

 

Figure 1. The structure of the sensor.

The simplest circuit for the measurement of the voltage output is illustrated in Figure 2 and 3. This connection called as a voltage divider. In this circuit, a 10 kOhms resistor was used.

Figure 2. Voltage divider.

Figure 3. Circuit connection

 

Below you can find download links for the STL files of the sensors for a 3D printer with a dual or single extruder (Fig. 4 & 5). Using a single extruder, each printed layer should be glued.

Figure 4. 3D printed pressure sensor with a dual extruder.

Figure 5. 3D printed pressure sensor with a single extruder.


To test the pressure sensor, a calibrator was developed (Fig. 6). STLs of the calibrator are also included at the end of this post.

 

Figure 6. The structure of the calibrator.

 

Applying 5 weights (each one was 1 kg) in a pressure sensor printed with a dual extruder, the measurements were extracted (Fig. 7).

 

Figure 7. Applying 5 weights.

The results are not linear, they follow an inverse exponential attitude. In higher values, more force is needed for less change of voltage. Every printed sensor does not present the same behaviour, the voltage output could be different for each one. However, the produced 3D printed pressure/force sensors have similar behaviour with commercial Force Sensitive Resistors (FSRs) sensors and with minimum cost; each one is estimated in a few cents.

Code (Output voltage):

float reading = 0;
int dt = 20; 
unsigned long t=0;    

void setup() {
Serial.begin(115200);
}

void loop() 
{
t=millis(); 
 reading = analogRead(0);

 Serial.println(reading*(5.0/1023));


while((millis()-t) < dt) // Making sure the cycle time is equal to dt
  { 
  // Do nothing
  }

}

 

One way to calibrate the sensor is by applying weights and recording the output voltages. After, using interpolation the relative weight or force can be estimated. More weights yield better accuracy. Calibrator code can be downloaded at the end of the post. The code is based on repetitive procedure asking a weight and calculating the average voltage. Finally, a smoother could be employed for better results.

 

Components:
Modules:
(1x) Arduino Uno
(2x) 50cm Double-ended Crocodile Clips Cable Alligator Clips
(1x) Resistors
Force sensors:
(1x) Conductive filament
(1x) PLA filament
Calibrator:
(1x) PLA filament
(3x20cm) 10mm Threated rods
(18x) 10mm nuts
(1x20cm) 18mm tube 
(6x) 3mm bolts
(6x) 3mm nuts
(2x) 4mm bolts
(2x) 4mm nuts
Download Designs: Link
Download Code (Calibrator): Link


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