Acoustic Levitator DIY - TinyLev - levitate liquids and insects at home

[@lukemcclelland1172]

Through making your original design I found the easiest and fastest way to check the polarity of the transducers is to just hold them up to your mouth and create an input signal by making a popping sound with your lips. It cut a lot of time out of the process and I wasn't worried about damaging them by poking them.

[@bassviolin8180]

Great Project. We just finished building one before christmas, everything worked on the first try. Really great work and instructions!

[@MultiMedow]

would you please sell it to me? I´d like to do some experiments, but i don´t own a 3d printer and i also font know how to do it

[@neqhoward6474]

BassViolin Hi Can, I know how did you made the 3d printout? did you get from a software?

[@samiyanbaig5593]

Wanna ask you bro, that all 72 transducers are transmitters, right?

[@thobiex]

The way he said "never apply more than 10 volts!", as if it would cause some great catastrophe or something!

[@AlienRelics]

Most likely destruction of the drivers.

[@ReaperSound]

Crank that shit to 11

[@alaskanalain]

Next, try giant stone blocks used to make the pyramids.

[@omsingharjit]

Why using multiple times small transducer instead of one or two ?

[@UpnaLab]

to get enough powah

[@omsingharjit]

@@UpnaLab or will one high power transducer not work like from ultrasonic cleaner ??

[@UpnaLab]

@@omsingharjit I wish, but ultrasonic clearners may need some kind of horn attached on top to radiate properly into air. Also, with small emitters you can give them a curved shape, you cana lso give the horn a curved shape but it will vibrate as a plate. In general those small emitters are easier to get off-the-shelf but using big powerful ones as you say brings other advantages. you can check the paper from Daniele Foresti on Acoustphoresis

[@omsingharjit]

@@UpnaLab thanks , He did similar.. kzbin.info/www/bejne/jqGxk6ycrd2ejac

[@isaaca6445]

Can you use a kind of variable switch to make the droplets rise and fall gradually?

[@DubeDheerajPrakashchand]

Also the radius you mentioned here is the radius of the sphere of whose the curved parts are sections of , right? Also is it that this radius has to be an integral multiple of the lambda of the sound used so that there are constructive interference standing wave patterns formed?

[@ameliajarry2205]

@2:32 what is he adding to D10?He says a jumper but it looks as small as the push switch buttons.

[@UpnaLab]

It is to connect D10 with D11. You can use a jumper wire or the small bridges used to connect two pin headers in hard-drivers and other old computer components. BEst.

[@r.in.shibuya]

@UpnaLabs I am purchasing the transmitters, sometimes they are marked with a T and an R. I will assume T is what is needed? As R are receivers but look similar.

[@UpnaLab]

So far, for every transducer that I have bought T and R are exactly the same thing. Just be sure to mark their polarity.

[@r.in.shibuya]

@@UpnaLab Got it! And thanks for the reply.

[@theodatura6848]

hello, the 12 gauge wire does not fit into the screw terminal of the driver, do i need a different screw terminal, does anyone else have this problem and know a work around or if it is possible to use thinner wire? thanks

[@tooththrhr]

Hello, can I put a kit together like this with a multimeter ? I don't have a scope

[@Alan-xz5yb]

You can use a multimeter to test the polarity of the transducers. Just set it to dc and tap the probes to the tails. If you get a positive value then the positive tail is the one which you tapped the positive probe to. If its a negative value then its vice versa. I found it useful to have background noise (music playing) to get a clearer reading. fyi, over 80 transducers tested and they had all been marked correctly in the first place. The incorrect markings may be an old issue that has been rectified.

[@josuelujan6314]

if I use an arduino uno instead of the nano will the wire connections be the same still?

[@UpnaLab]

yep

[@ShopperPlug]

Can you use larger ultrasonic speakers to do this with a large cup of water?

[@UpnaLab]

the maximum size depends on the frequency. Lower frequency levitators (around 19kHz) can levitate droplets of 4mm diam. Going lower would be almost impossible since energy will be much smaller and frequency would be quite annoying.

[@ShopperPlug]

@@UpnaLab what if the frequency went higher? So it seems extremely large transducers are not able to levitate a cup of water.

[@DubeDheerajPrakashchand]

what did you mix in water so that it easily left the syringe or what did you mix in water to reduce the adhesion with the syringe?

[@koenwellekens]

Since these speakers operate at 40,000 HZ, should we be careful around pets (e.g. dogs)? These animals tend to be able to pick up ultrasonic frequencies if I'm not mistaken.

[@terryhalsteadgamer]

I have an idea i'd like the designers to try, making the precisely positioned speakers spin. All same direction, opposites etc etc . I wonder if it would make a difference to nodes. Would the focus power be stronger, could it hold more weight.

[@locouk]

So is this like weightless? I mean if it was scaled up to fit a person, would it feel like micro gravity with no weight on internal organs etc?

[@UpnaLab]

To be sincere I am still not sure. One pending experiment that I still need to do is to weight: the levitator whille it is off, the levitator while it is on, the levitator while it is on with some particles inside.

[@shershahdrimighdelih]

Asier Marzo That would be interesting. Do update on that if you don't publish it in a paper

[@Rene_Christensen]

One would expect that the weight is increased, as with the birds in truck, where a reaction force is present, whether the birds fly around in the truck or just stay seated. mythresults.com/episode77

[@AlienRelics]

The mass/weight of the combination is the same regardless if it is on and levitating or the particles are just sitting in the levitator with it off. Standing waves between the top and bottom transducers are what is holding the particles in place. This creates a reaction force on the transducers, pushing them down exactly as much as the particles are being pushed up. For every action there is an equal and opposite reaction.

[@walterwhiteyo469]

could you give me the code you used for this project because I am trying to build my own one

[@thejestern]

Amazing, is it maybe easier to do it with bigger speaker cones? Like car speakers

[@UpnaLab]

Mmm car speakers are not that good generating sound above 20kHz. From all the methods that I have tried, these transducers are the best in decibels per $, and also in decibels per cm2. But you are right, sometimes we use "tweeters" for some experiments.

[@allyc0des972]

Can this be used to control plasma? I know fusion ractors are struggling to use magnets to control it?

[@UpnaLab]

Ultrasound will affect the plasma but will not work in the vacuum that they need.

[@rashmikashyap2963]

In which unit should I 3d print the base in mm or inch ??

[@UpnaLab]

mm, for example the v1 base is 156.5x78.6x85.5mm when imported in Cura

[@DubeDheerajPrakashchand]

also what kind of fabric did you use?

[@LucaAmadeus]

this is so cool. I will totally build one. Thank you very much for the in depth explanation

[@_beaten_path]

What happens if you exceed 10v? Boom?

[@ronnyt5914]

the polarity is labeled at the back of my speakers with a "+", is this reliable or should i doublecheck? thanks for that awesome project!!

[@UpnaLab]

double check, always. I added one video on how to check the polarity with a multimeter.

[@JaviGB21]

How can I apply 8 or 9 V to levitate water and alcohol, I don't know how change the voltage, help me please, I'm doing my DFD with this kit. Thanks

[@UpnaLab]

Regulated power supply, or just a dc-dc step up, also the provided power supply from the kits is 9V. Also, many wall dc adaptors can select between different voltages.

[@JaviGB21]

I'm from Spain, could you give me your email? Thank you for all.

[@UpnaLab]

@@JaviGB21 Sure asier.marzo @ unavarra.es

[@nagoyanagoya7621]

Is it possible to lower the voltage of the power supply to make the liquid float in the air? What effect does that have?

[@UpnaLab]

liquids are tricky, too much voltage and the droplet pops, too little and the droplets fall

[@nctukevin]

hi, can I use a signal generator and a power amplifier to drive it?

[@supriyasonawane3342]

May I know from where do you buy that transducers? I want to buy it. If it is available online please send me the link

[@UpnaLab]

Sure on the instructables link in the description you will find links to individual components as well as link to kits with all the components. Best.

[@wonderfulc6002]

Hello, Asier, how are you? our levitator is very noisy and we have tried to repair in all the ways but we do not know, do you have any indication that it is?

[@UpnaLab]

Is d10 connected to d11? Are the lights on the arduino and driver on? Kindly take a look at the instructables comments

[@wonderfulc6002]

@@UpnaLab Yeah sure. The arduino and the circuit are correct since we tested them with another partner but we do not know what happens because the transducers give a loud noise.

[@akaoxys7509]

Is the two hole on the up side and the down side of the 3D print base important ?

[@UpnaLab]

Not at all, but it facilitates liquid ejection or adding a camera/laser from that direction.

[@garrytalaroc]

can I make this project without the L298N motor driver?

[@UpnaLab]

In the instructables there is a minimal version called microlev. However, you can get that component for very little money (2.5£)

[@garrytalaroc]

Thank you do much!

[@garrytalaroc]

Asier Marzo is it possible also for us to use the peizo buzzer or buzzer to generate above 20k hertz? Another question, what's the importance of the L298n? And again, thank you so much for everything, you're so cool.

[@UpnaLab]

do not think so, they output very very little power compared to the 40kHz transducers.

[@AlienRelics]

The L298 is an H-bridge driver. You'd need to replace it with another H bridge driver, or build your own from parts. Piezo buzzers have a sharp resonance in the audible range, usually between 1kHz and 3kHz. It is unlikely you'd get any significant power out so far off of resonance.

[@Centuries_of_Nope]

2 questions: 1: What is the purpose of the acoustically transparent fabric? 2: Having someone print the STL file, is too pricy. Would I be able to make this work with a flat array if I were to put in the effort to make it work? From the research I've done so far, yes, but I still have a bit to learn about the physics before I invest.

[@UpnaLab]

1. That fabric can be used to place objects inside the levitator or to protect the bottom transducers from spillages. 2. Mmm you can use a flat array but the trapping will be much much weaker. In 3DHub for something between 12 and 16 pounds you can get it printed in PLA or ABS.

[@Centuries_of_Nope]

Asier Marzo I have some questions about the pizos. 1: Do I need plastic case or aluminium case? 2: Do I need the function of transmitter and receive to combined or separately? 3: Do I need it to be sealed or not?

[@UpnaLab]

I evaluated various models here aip.scitation.org/doi/suppl/10.1063/1.4989995/suppl_file/si_4_am.pdf If you are going to build TinyLev you need 40kHz 10mm diameter transducers: MSO-P1040H07T. I think they are plastic, only transmiter and not sealed. The best ones for BigLev (16mm diameter transducers) are the ones with aluminium casing, only transmiters and not sealed. That is the MSO-A1640H10T

[@alonsogarrido9084]

Hi. How Is the difference in efficiency the MSO-P1640H10TR www.buzzer-supplier.com/product/ultrasonic-sensors--mso-p1640h10tr_6967.html compared with the MSO-A1640H10T? Thanks and best regards.

[@UpnaLab]

No idea, in general the transmitter only should be better than the TR system. Although I think that actually when you ask for the TR transducers they will offer you separate T and R types.

[@nathanneuenschwander3986]

If you place your hand between the arrays, does it feel like anything?

[@UpnaLab]

www.ultraleap.com/

[@clemchia1]

very interesting.. what is the model of the audio transducer?... ultrasonic ?..

[@clemchia1]

sorry... got it ... MSO-P1040H07T

[@UpnaLab]

Any 10mm diameter 40khz transducers would do the job. I listed in the Instructables the cheapest.

[@ThePilotJ]

Are all 72 sensors a transmitter? Or is the receiver mixed? Sellers said to sell separately.

[@UpnaLab]

They are all transmitters but it does not matter that much. Could comment on the instructables?

[@OrigamiCreeper]

in the Instructables, one of the things that come with the package is a power supply for a British plug, the plug says it has "multiple voltage" I am not sure what that means(www.amazon.co.uk/dp/B00WOIV8NE/ref=cm_sw_r_cp_ep_dp_S0lJzbZAP0ES3) so how could I find a plug that works for an American outlet?

[@mateuszjanowski2521]

Hi, I am working on a project involving this kit. Do you know if it is possible to create acoustic Vortices using this design, but with modified hardware?

[@UpnaLab]

You could modify the height of the transducers to achieve phase modulation and get phase delays. I have seen some papers doing that: kzbin.info/www/bejne/rKLIZIysnc6pj7c

[@KarlHeinz34]

which physical variables of the acoustic wave gets varified by changing the voltage? and how does this effect the levitation of the objects?

[@wonderfulc6002]

Can I exchange the 40 khz transducers for another one?. Can I use a lower frequency transducer?

[@UpnaLab]

I have only found 40 kHz and 25 kHz transducers with enough power to levitate, and the 25 ones do not work that well.

[@wonderfulc6002]

Asier Marzo Whats about a HC-SR04?, it is a Arduino circuit

[@rshade407]

Hey, is it possible for you to build one for me. I an a physics teacher and would like to teach the students

[@sergiosergio1357]

I laughed a lot thinking about me trying build this machine!

[@dominiclove5269]

Do you think it's possible to make a room that can levitate people. Like in the movie Ender's Game. If so, how?

[@UpnaLab]

Not with the current technology in acoustic trapping. The power would need to be so high that your skin will burn and you will collapse. Also, the frequency would need to be incredibly low (audible range) because the maximum particle size is less than half-wavelength. But I am sure we will find ways or other suitable technologies for that : )

[@nikasharvashidze5664]

So the levitation is depended on the size of the object being smaller or equal to lambda/2 and also about density. I have been doing research about this subject and I have concluded that this process requires Pvg to be equal to Pogv (Bouyancy = Weight). Is this correct and if so how does the density of the object change the density of the air around it.

[@jhanh4516]

We are having trouble levitating liquids. We have a bent needle with the tip removed but it is not working, the droplets keep falling. Can you tell us what liquid you are levitating in the video, and do you have any other tips?

[@UpnaLab]

You can use some levitated styrofoam particles to know approximately where to put the droplet. You can increase the voltage up to 12V if that helps, but usually 9V is enough for levitating water. If the levitator is not strong enough it may be that some of the transducers do not have the correct polarity. Best.

[@jhanh4516]

How do I increase the voltage up to 12V? And what piece of equipment do I use to check it is up to 12V? Thank you for your fast reply

[@UpnaLab]

The power supply that you use to power the device may have a regulator to select the voltage.

[@jhanh4516]

Okay, I am currently using a Variac to power the acoustic levitator and measuring the voltage to the transducers using a multimeter. Can you tell me what piece of equipment you are using in the video?

[@UpnaLab]

A variac is to transform AC into AC. The input to the levitator should be DC (from 6 to 12Vdc). A normal power plug like the one referenced in the instructables does the job. I am using a regulated power supply.

[@MultiMedow]

wow, i´d like to rebuild this according your manual. Where can I buy the equipments, esspeciallyy the 3d print out model?

[@UpnaLab]

kindly, check in the description there is a link to the instructables. There you can find links to the individual components or if you prefer MakerFab sells a kit with all the parts www.makerfabs.com/index.php?route=product/product&product_id=508 . Best.

[@abrahamvega2085]

Can I replace the transducers with a HC-SR04?

[@UpnaLab]

you will need to desolder the transducers, they are also 16mm. In the instructables at the end there is a simple design using only two 16mm transducers.

[@abrahamvega2085]

Asier Marzo thank you, this proyect is so cool and amazing, someday i will get one

[@digitalwrenchworks]

brilliant Asier! How much would it cost to scale up to levitate an object about 20" in diameter and 20lbs?

[@UpnaLab]

Thanks man. Acoustic levitation has 2 limitations in the objects that it can levitate. The object cannot be bigger than half-wavelenght (40khz in air is 8.6mm), so this levitator can levitate objects of up to 4mm diameter (in the instructables there is a levitator that works at 25kHz so it can levitate objects of up to 7mm). The second limit is the density, this levitator can levitate objects of up to 2.2g/cm3, in the instructables there is one levitator that can levitate up to 6.5g/cm3.

[@williadYT]

Does the circuit put out square waves or sine waves to the transducers? I saw both flash by on the scope. Also, why is it nessecary to use ultrasound? Why couldn't you use two piezeo tweeters and 10kHz? Then the size of the object could be 4 times as large

[@UpnaLab]

The driver board generates square waves because they are easier to generate and cheaper to amplify. However, the transducers are so narrowband that their output is sinusoidal. There is some measures here aip.scitation.org/doi/suppl/10.1063/1.4989995/suppl_file/si_4_am.pdf . Piezos do not have enough power to levitate, take into account that the employed 40kHz transducers are really powerful, also doing levitation at 10kHz would be deafening.

[@dm1mccormick]

Looks like a great project ! I would like to build with my son. Any recommendations for a UK supplier of the transducers - you mention cost about $80, but at RS components it is £290 just for the transducers ?

[@UpnaLab]

Cheapest ones are from the links in instructables. Ningbo or manorshi, they may sell you 100 of them instead of 500.

[@dm1mccormick]

Many thanks Asier. I found a local shop that happened to have them in stock for a reasonable price. Prior to that, I found Alibaba would have been the cheapest option.Thanks once again for your video and I am really looking forwards to attempting this. It is certainly a step up from my PID sous vide controller and has rekindled my enthusiasm for invention, science and technology!

[@UpnaLab]

That is great, finding good and cheap transducers is usually the hardest part. In a couple of months I will try to publish a directional speaker that pretty much uses the same hardware.

[@christophemalvasio5569]

can you extend it to accurately manipulate melted plastic/metal ?

[@UpnaLab]

This one will work with melted plastic, and there is a bigger version (BigLev) that can levitate some metals. However, anything above 6g/cm3 is a little bit complicated.

[@christophemalvasio5569]

nice where to found an assembled one ? ( i' m too handicapped to assemble

[@UpnaLab]

I was talking with a company that could sell them already preassembled but for the moment assembling one is the only option.

[@christophemalvasio5569]

ok sad for too handicapped people what system do you use to accurately position things in the big model ? is there a site as wevolver where open-source work is possible for it ?

[@UpnaLab]

These systems can only move the particles up/down. For 3D control we need individual control of each of the transducers, we use a 64-channel driver t kzbin.info/www/bejne/nZCofmSvabJ-icU . I was going to publish the hardware&software for that soon but it is a little bit more complicated than these Instructables.

[@25sideral25]

Hi, What would happen if i put some ferrofluid in the middle ? a magnet ? i was thinking to put some ferrofluid in a cylinder and make the liquid move. Is this possible ? Or could it be possible to code the magnets for making spin the liquid in the middle ? The liquid stay in the midle but the magnetic field make it spin ? I'm thinkink about that for an code project in university in art program.

[@UpnaLab]

Ferrofluid will levitate normally and then wit a magnetic field you can affect it. A magnet may be too dense to levitate, perhaps one of the rubbery ones, or a tiny one inserted into the particle.

[@JorgeGamaliel]

Amazing!! Thanks for sharing.

[@ferchioouwu4659]

does someone know where to find the code pls

[@UpnaLab]

Check video description, in the instructables there is everything needed.

[@grasya26]

but the code on the website doesnt work

[@UpnaLab]

@@grasya26 If you describe the problem on the instructables, we will try to solve it . BEst.

[@KismetEquine]

Hello, The supplier asked me these questions and I'm not sure of the answers to the second two. 1,what is the size do you need? 10mm or 14mm or 16mm? 2,do you need plastic case or aluminium case? 3,do you need the function of transmitter and receive to combined or separately? 4,do you need it to be sealed or not? Thanks

[@UpnaLab]

10mm diameter 40kHz transducer, only emitter.

[@houza110]

Hello , my name is An-ichat , i'm french and i live in france , i would like to do an acoustic levitator for my school project . can you help me please , it's something very important for me . Sorry , i have a ver bad english.

[@UpnaLab]

Check the link to the Instructales in the description. You will see links to the components or a kit with all of them together. Best.

[@houza110]

Asier Marzo ok thks but do you know where can I buy the kit in France ?

[@UpnaLab]

Most of the components are easy to get anywhere (amazon&ebay) the transducers are a little bit more tricky since you need to use aliexpress. I recommend the kit.

[@realtortrevonjoseph3860]

Where do I purchase these components?

[@UpnaLab]

www.makerfabs.com/index.php?route=product/product&product_id=508 www.tindie.com/products/Makerfabs/acoustic-levitator-kit/ www.robotshop.com/de/de/acoustic-levitator-kit.html or you can find the individual components in the Instructables (link in the description)

[@andrewmead1434]

are you just using the arduino to generate the frequency?

[@UpnaLab]

Yep, the arduino generates 2 40kHz signals and can change the phase between them.

[@andrewmead1434]

could you possibly use a tone generator instead?

[@UpnaLab]

Sure thing, but we tried to minimize cost (2£ for the nano), space and complexity.

[@AlienRelics]

If you have a tone generator that has two outputs with variable phase delay between them, then probably yes. But it would still need the L298 H-bridge to drive the transducers.

[@wonderfulc6002]

can be used with water?

[@UpnaLab]

Sure, in the instructables (link in the description) there are pictures of different samples levitating, one of them is water droplets.

[@_michaelmolloy]

Will this work horizontally as well or only vertically?

[@Peaches-yj8xk]

michael molloy vertically

[@tarunverma2887]

pls share the arduino code.

[@UpnaLab]

www.instructables.com/Acoustic-Levitator/ Step 13, Nano_TinyLev.ino

[@abrahamvega2085]

Hello again, did you use another program apart from arduino ide?

[@UpnaLab]

Nope. Although for simulating the fields I used software from Ultraino.

[@nicholasg.4778]

That ant tho

[@ariyanbhattacharjee597]

😂

[@placebo_yue]

amazing project man. I'll save your video and instructables, hopefully i can make one for myself one day. It doesn't look too complicated although im sure it harder than you make it look heh

[@deathshaker0026]

I can't wait to get a kit or two. I am a maker in western canada. I am sure the members in my makerspace would go bananas over them.

[@UpnaLab]

Glad that you like it, in the Instructables we will publish a directional speaker in a couple of months. It uses pretty much the same hardware.

[@deathshaker0026]

Im guessing its the 64 channel one. Thats a cool video also. I had first seen acoustic levitation three years ago and have been wanting to play with it ever since. Then I had seen it on Physics Girl channel.

[@UpnaLab]

The 64 channel one is more oriented towards researchers. I am preparing a much simpler directional speaker.

[@deathshaker0026]

You are too awesome. I love how passionate you are. I should put my stuff on youtube. I just use my makerspace forum for projects research,studies. Things I make. Led cube, cnc machines, cymatices, hologram displays, and art. I mainly play with electronics. Its all self taught with the help of internet and youtube.

[@RogerBarraud]

Bad use case... ...the bananas will be bruised and inedible :-/

[@sarait415]

i could not download 3D design and the Code also cuz i don not have premium account .... can any body help me ...i will be very thankfull

[@UpnaLab]

I did not know that you needed premium Instructables to download the STL and the code. www.instructables.com/id/Acoustic-Levitator/ let me know if that is the case amarzo @ hotmail.com and I can send you the STL and code.

[@sarait415]

@@UpnaLab sorry for late . i contacted you sir this morning thank you very much

[@brucewayne8966]

The file for programming the Arduino isn’t working properly for me, do you know what kind of application I need to fix this?

[@brucewayne8966]

It won’t upload file. Says it has an issue uploading the script

[@UpnaLab]

Could you ask in the Instructables attaching an screenshot? thanks!!!

[@ThePilotJ]

I saw and followed the manual that you provided. But it failed. I bought the sensor I bought here (goo.gl/yazm45) Could the sensor cause a problem? The Aduino and L298N Dual Motor Drive Board made a square wave like you showed. However, when two sensors were facing, a sine wave was not formed. What is the frequency when a sine wave is made? And what was the voltage of the sine wave? Where is the current value of Step 19 measured? And are transducers and transceivers the same? I want to make it really successful.

[@DanielGutierrez-xj6vz]

Muy bueno !

[@Antonisdettor]

Is the guy who speaks Greek?

[@shirolee]

You are awesome!!!

[@zoez8185]

Sir I theoretically deducted that human can control quantum level of objects and can do telekinesis. I can do telekinesis in the brain wave of delta and gamma, your experiment of using sound wave to control object really caught my interest. I will explore more scientific theory that you provided:) and maybe contribute to the physics in the future, the 10th dimensions theory is really fascinating to me

[@duraiumionhilarisch3227]

You can also levitate your medication;)

[@markliles4113]

Very very Nice!!

[@RogerBarraud]

I believe you forgot "Slappa Youself!!11!" when you discover that you wired a few transducers backwards :-/

[@shyleshsrinivasan5092]

Pretty cool and decent !

[@معقم]

If i only i had a way to check the polarity of these guys i would've done it, really good idea btw

[@Y___Y___Y]

Nice👍👍👍👍👍

[@RogerBarraud]

DC BarBell? WAT? Bro, do you even Vdd?

[@RogerBarraud]

Hopefully there is another video describing how to make ultrasonic earmuffs for your poor pets :'( #AAAggghhTooLoudForKittehAndPuppeh!!! :'(

[@RedDotCityx2]

Make a huge one lol

[@yt_prakhartiwari0]

SIMPLE, VERY SIMPLE!!, Can be easily made at home!!!! 3d printer and many other materials are just like clothes lying everywhere in our house....

[@koreyhayden1368]

To bad a normal person couldn't diy this haha

[@xiaabaisa1690]

Hi, does the exposed wire have to wrap around the pins 6 times for a reason? Could someone explain it to me?