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This is a 3D printed LED lamp project that looks like a giant knob. Turn it, and watch it glow from the inside.

    This instructable is meant to be a companion to the webinar series I'll be hosting starting March 15. Design Now: Hour of Making in Motion will focus on mechanical assemblies and integrating electronic parts in Fusion 360. Follow this link to register for free.

    Step 1: Tools and Materials

    All the parts can be purchased on Amazon. You can also buy the hardware on McMaster-Carr, which may be more convenient because you can make an order through Fusion.

    ELECTRONICS

    HARDWARE

    FILAMENT

    Any filament will do, but I like the results I get with Alchement Wood Fiber PLA. It's out of stock on Amazon, but I think this one will have pretty much the same look:

    TOOLS

    Step 2: 3D Modeling + Printing

    Above is a screencast of me rebuilding the model based on the original one I had designed previously. If you click on the actions in the different tracks, you can follow my work flow.

    This project is the subject of a webinar I'll be hosting on March 29th as part of a series called Design Now: Hour of Making in Motion. I'll be covering mechanical assemblies, integrating electronic parts, and general modeling techniques.

    The files attached in this step are as follows:

    • The F3D is the complete design in a Fusion 360 archive format. If you're new to Fusion, please sign up for my free 3D Printing class. In Lesson 2 you'll find instructions on how to get a free license as a hobbyist or student / educator.
    • The STLs are printable files that you can bring into any slicer

    The design is pretty simple, it's a base with a dimmer built in, and a cap that acts as a giant knob. There's a ring on the inside that keep the knob cap in place, and the knob cap plugs into the potentiometer post on the dimmer. With the base stationary, twisting the knob cap turns the potentiometer and dims the LEDs.

    Step 3: Assembly

    The assembly is really simple. All the holes are sized properly in the model, so the whole thing just snaps together.

    All the parts you need are seen above.

    1. The LED strip has adhesive backing. Cut the strip to size so that it fist on the rim, then remove the backing and stick it to the base. You may also want some extra glue or a hot glue gun for the LED strip.

    2. Insert the DC terminal and fasten it in place with the provided nut and washer.

    3. Solder the wires to the leads on the LED strip and to the DC terminal. Give yourself enough length to work with in case you need to make corrections. Generally Red is + and Black is -, but it doesn't really matter because you've only got two options and you can switch the wires on the screw terminals if the LEDs don't come on.

    4. Push the dimmer into the hole in the bottom of the base, then use the M4 screws to fasten it in place.

    5. The wiring is dead simple. Just insert the stripped ends into the appropriate screw terminals. IN is where you screw in the wires from the DC terminal, and OUT is for the wires from the LED strip. When you plug in the 12V adaptor, the lamp should now turn on automatically.

    In this picture you can see I've also put the ring on.

    6. Now that the base and electronics are assembled, it's time to add the knob cap. There are two semicircular holes that match the dimensions of the top of the potentiometer. Just line up the holes and press down.

    In retrospect, it might have been better to just have a single hole. The metal post of the potentiometer is made so that you can widen the gap with a flat head screwdriver. This would have made it easier to press on and would have made it adjustable.

    7. Now that everything's in place, just line up the ring holes with the tapped holes in the underside of the knob cap and screw in the M2 screws.

    Step 4: Lessons Learned

    Overall this project was pretty successful and worked on the first try. If I were to do it over, I would probably pay more attention to the location and exposure of the LED strip. I recessed the LEDs up into the knob shell in order to hide them, but it doesn't emit much light as a result. I think having some exposure would be an acceptable trade off for more light. After all, it's hanging on a wall, so you wouldn't really see the LEDs anyway.

    <p>JON-A-TRON, i'm a new member just joining the building instructables team could you possibly give me helpful advice on a project im working on ? if not that's ok i'll still make it i would just care for some help write back to me if you are interested sir.</p>
    <p>Sure, what's the idea?</p>
    well sir i want to make a turning table that turns gears on the top of it. i have a poorly drawn design on my google drive but with effort i believe it'll work nicely.
    <p>Should be easy enough. I would start with this youtube video on spur gears in Fusion: <a href="https://www.youtube.com/watch?v=KbhSQZ236EE" target="_blank">https://www.youtube.com/watch?v=KbhSQZ236EE</a></p>
    <p>Nice job and certainly gives me some ideas - since I am a woodworker (and a 3D printer is not in my immediate future), I immediately though of a turned wood knob version. And further I thought this would make a very nice night light for a children's room. All kinds of potential. I did sign up for your 3D printing class and already have Fusion 360 downloaded. Now to reconcile more stuff to do on an already overloaded 'to do' list.</p>
    Thanks for joining us! I hope you're able to expand your skill set. Woodworking + 3D printing is a powerful combination. A turned wood version of this would be gorgeous. You could even do it with a super thin wall and make it glow from within.
    Trying to make a wood turning thin enough for light to pass through - probably (in a practical sense keeping in mind physical strength limitations and skill level of wood turner) not practical. But combining a layer approach with wood and plexiglass or another plastic - that might work!
    <p>Maybe something with wood and epoxy/resin. Tint the resin.</p>
    <p>I was just thinking the same thing when I first saw this except mixing epoxy and phosphorous zinc and embedding it with wood seep through the cracks for light to shine through as a unique design or electrocute the wood to even exotic look. So many ideas flowing through my head of endless possibilities. Nice work John-A-Tron. Dee18 like minds think alike. ;-)</p>
    <p>Turning one was the first idea that came to my mind seeing this, before reading the title even. That would be beautiful, share it if you make one!</p>
    <p>Hello! It looks awesome and I want to make it. Can you upload the base.stl file?</p>
    <p>Oops! Just added it.</p>
    <p>Thank you!</p>
    Great job and great idea! Just one thought before everyone goes to copy it. To keep consistancy remember &quot;righty tighty, lefty loosy'. What do the rest of you think?
    <p>Yeah, it's kind of weird. Turning it to the right seems natural because that's how all knobs work (volume knobs, etc.), but this somehow feels like it might be turning the wrong way just because it's so big I guess.</p>
    <p>Looks good. If you could hide the supply it's just a big knob on the wall!</p>
    Should be easy enough with a junction box. It's low voltage, so there's no need to worry about fire.
    <p>Looks good but I suggest you kmprove your understanding of British slang.</p>
    Walked right into that one, didn't I?
    <p>I was slightly disappointed when I clicked that link, but it's still a pretty sweet lamp.</p>
    Sorry to get your hopes up.
    <p>*teehee*</p><p>Ace lamp though!</p>
    <p>cool design - lighting really makes it stand out. </p><p>PS: nice comment policy prevents me making a lewd remark at the title, so I won't. </p>
    It's not that kind of lamp!
    <p>Jon, to get more light, you may consider making the lap &quot;taller&quot; so that there is more space between the wall and the base of the knob. I think that this would give more light without taking away from the theme. Make sense?</p>
    Yeah, that would probably help. The main thing I think would be make the rim shallower so that the LED strip is expose more, that would give it a much wider throw.
    I really like it. How hot does the material get from the LEDs? Concerned about longer term lighting with the design. Have you done any testing? Thanks
    The literature from the company has thermal information. This setup gets barely warm to the touch.
    <p>Really nice looking and great way to turn it on! love it!</p>
    <p>Thanks man!</p>
    <p>Amazing! Thanks for your share</p>
    <p>Thanks for saying so!</p>

    About This Instructable

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    Bio: I'm a full-time Designer at the Instructables Design Studio (best job ever). My background is in residential architecture, film set design, film animatronics, media ... More »
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