Bunk Bed With No Screws

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About: Generalist twitter.com/SklyarYuriy facebook.com/yuriy.sklyar

Intro: Bunk Bed With No Screws

Here's a project I've been working on during my spare time for the past ~two years. It started off as a simple Tinkercad prototype which was printed as a scale model on a MakerBot Replicator 2 for testing purposes. The idea worked great, however development was put on hold. Project finally resumed at the end of 2017 when the family grew yet again and the kid's room required a makeover.

A common pattern when thinking about furniture design is using screws/bolts to fasten things. This got me thinking if there was another way, a way which requires no fasteners – just simple design thinking.

The bed was designed around three main constraints:

  • the crib mattress size (52"×28"×7"),
  • tight space the structure must fit into (72" in length) – with 1/4" of clearance on each side, and
  • ability to be cut out of freely available materials – a standard 3/4"×4'×8' panel was selected for this reason.

I wanted to cut out as little material as possible out of the side panels to keep them as strong as possible... I wanted to be sure it’s the safest it can be for kids. To commemorate the location of where this bed was designed, the top panel actually resembles Golden Gate bridge – the first bridge you see as you enter the Bay, and the oldest one, just like my oldest son (where he sleeps). Bottom one is the newest portion of the Bay Bridge – it is elegant and not as old as GG bridge, just like my younger daughter.

The beauty of this idea, however, is that one could truly customize their bed with anything from child names, to other, more complex/intricate designs. I wanted to keep with the super minimalist style for v1.

Perhaps the most brilliant bonus of this design is that, unlike most bunk beds on the market, it can be easily mirrored, meaning you could have the steps either on the left or the right side of the bed, by simply flipping a single panel! That, is pretty cool, if I do say so myself.

Speaking of stairs, they were integrated for extra storage (designed to fit 12" books standing upwards) and at the same time greatly increase the overall strength of the bed structure. Addition of books provides for added weight, which attributes to added stability of the bed. Initially I had designed the bed to feature drawers, but due to the recent explosion of kid's books in our library, we desperately needed the extra book storage.

You would also be pleased to know that the assembly of this bed requires absolutely no tools; only the disassembly requires pliers (for safety reasons ;) ).

Now, unless you go out of your way to try and disassemble the bed, it will stay in-place without any problems. That might not be the case with kids, however. My children dismantle anything and everything, so it was important to add an extra layer of safety. In the spirit of not using any type of common fasteners (bolts, screws), as well as the open design nature, I've designed a simple 'locking clip' mechanism which can be easily 3D printed on literally ANY FDM 3D printer.

Speaking of safety, the bed was designed with the following in mind:

  • Guardrails on both sides of the upper bunk, except for up to 15 inches at each end of the bed.
  • The upper edge of the guardrails shall be no less than 5 inches above the top surface of the mattress when a mattress of the maximum thickness specified by the bed manufacturer’s instructions is on the bed

    (7" in this case).

  • Guardrails shall be attached so that they cannot be removed without either intentionally releasing a fastening device or applying forces sequentially in different directions.

  • That openings in the structure surrounding the upper bunk be small enough to prevent passage of a tapered block having a base measuring 3.5 inches by 6.2 inches.
  • That openings in the end structures and the FHSA rule addresses hazards associated with bunk beds intended for use by children.

The rules are issued under both the Federal Hazardous Substances Act (FHSA), for bunk beds intended for use by children, and the Consumer Product Safety Act (CPSA), for bunk beds not “intended” for (but often used by) children. These rules came into effect on June 19, 2000 and apply to all bunk beds manufactured in the United States, or imported.

But yeah... Use this bed at your own risk!

Best place to get the most up-to-date information on this open source project is the official website: www.freebunkbed.org

For those who wish to learn more about the design of this bed, head over to my blog, where you can check out some of my other projects.

I should make a note that this bed is free for personal, non-commercial use. In case you have commercial ideas/suggestions, please do reach out!

Read on in case you're here to know how to build one for yourself!

Step 1: Materials

As previously noted, this bed was designed to be as accessible as possible (in every meaning of the word), and as such, you will require 5-6 sheets of standard 4'×8'×3/4" plywood. Why the range? Initially I've designed the bed to fit 5 sheets - the most cost-effective way to build it. After examining the bed design, my friend recommended that I add an extra support for the top bunk, which was a fantastic suggestion, and is currently how my kid's bed is set up. With that in mind, the top bunk with support can hold anywhere from 150-250ish LBS, while without support it can handle up to 150(ish) LBS. You guessed it. If you want your top bunk to have extra support, prepare to use 6 sheets of plywood. Cut it out and experience it for yourself. [The bed can easily handle adults, given they can fit].

Depending on your budget, the cost of plywood can be as little as $20-50/sheet, and go into several hundred dollars per sheet. Initially I was planning on using Russian 11-ply, however right before cutting the bed, decided to switch to a local USA-made 7-ply maple, which ended up working just fabulously! This was in the range of $60-70/sheet, or $360-$420 for 6 sheets.

BONUS: in case you'd like to build the miniature version (a scale model) of this bed, feel free to download the SVG file. As seen in STEP 1, it can be cut out of various materials, so you'll have to manually scale the file depending on the thickness of your material. This can be a great addition to any doll house or a [useful] showcase piece which could be used for storing essentials such as keys and wallets! Check out the laser cutting class in case you're interested in this version of the bed.

Step 2: Cutting

This bed can be cut out with any ShopBot/CNC that can accommodate 4'×8'×3/4" sheets of plywood.

Check out the many photos here to get an idea of the process. The CNC we used was quite incredible, actually, and, unlike ShopBots, where you have to clamp everything down, this one was using a powerful vacuum system to hold the sheet in-place. This reduces the work by at least an hour, I'm assuming... I won't get into details of how to use a CNC - there's actually a class for that, so all I'm going to say is that you can grab all the files from here. Be sure to create dog bone fillets, otherwise you'll have issues with assembly.

Once cut, you should consider rounding all of the sharp edges - my wife/kids appreciated that little big detail. Use the 3/8" round over bit for that.

Step 3: Finishing

If your plywood came finished on both sides, all you'll have to do is round off all the edges for best usability experience using a router, and then thoroughly sand all the edges. The better your sending job, the longer your bed will last.

In case your plywood came finished only on one side - like mine - you'll have to manually stain the other side. I got recommended this BeesWax product by a friend who is very particular about the products his kids come in contact with, so rest assured that this has been deemed very safe for child use. It also makes your room smell nice for the first couple of weeks! :)

Be very thorough in your staining as bed's lifespan greatly depends on how well you protect otherwise exposed wood. One bottle covers single bed.

Step 4: 3D Printing

This step is required in order to complete your bunk bed. Head over to the downloads section and grab 3D printable STL files for clips that are used to secure all panels in-place (to prevent them from coming out).

The idea, just like the bed itself, is very simple:

  1. Insert panel.
  2. Slide panel down.
  3. Insert clip into the remaining opening to secure it in-place.

See the attached diagram for more detail.

Depending on how dark your wood is, there are two options of PLA filament you can go with. See attached photo of the darker locking clips, and lighter clips that hold LED lights (I prefer MakerBot filament for its consistency/ease of use).

Be sure to check out the official Store section in case you're interested in some 3D printer recommendations.

Step 5: Assembly

Be sure you have the 3D printable assembly clips before proceeding with the assembly of your bed. (Check the previous step for more info.)

Assembly of this bed is meant to feel more like an enjoyable puzzle, rather than instruction manual-referencing-fastener-selecting torture, that furniture assembly is turned into most of the time. In fact, the assembly is so intuitive, that most of you won't require a manual in order to "solve this puzzle".

Perhaps I will get around to creating a dedicated manual, but for now, please use photos included throughout this Instructable to get an idea of how the bed comes together.

Step 6: Accessories/Add-ons

Besides the ability to add ambient, energy-efficient LED lighting to the bed itself (as seen in the photo), as a bonus accessory, the bunk bed design includes two night tables, which could be made spill-resistant by creating a 1/2" groove using a round router bit (see photos). My kids love them!

In case there's enough interest, I'll consider releasing several other add-ons that make your bed even more useful!

Step 7: Enjoy the Zzzz's!

May you and your kids have many nights full of rest, and please, don't sue me for anything :)

Visit the official Store to get all the supplies you'll need to build this bunk bed.

www.freebunkbed.org for more info. And my blog for the design/creation process.

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    39 Discussions

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    DavidK32

    Question 4 months ago

    Hey, super cool design and thank you for the upload.

    Your website seems to be down, is there anywhere else where i can download the files?

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    gtnz

    8 months ago

    excellent best looking one I've seen in a long time

    1 reply
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    charlessenf-gm

    8 months ago

    Excellent build.
    What did it cost?
    I suspect the materials were relatively inexpensive, but the cost of machining - even were one to have the appropriate control files in hand would exceed the cost of materials.
    Given one can purchase a Bunk bed for $200 or so - including fasteners ;), how practical is this build?
    One question about the CNC process. You suggest routing the edges before assembly. Isn't this withing the capability of the CNC process - changing the cutting bit out for one designed to round over edges? Thus accomplishing the rounding over as part of the part's creation?

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    yuriysklyarcharlessenf-gm

    Reply 8 months ago

    You make an excellent point! The process could certainly be dialed in to be more efficient. Manual routing was a last minute decision ;)

    The reason why I created this particular bed design is because no other bunk bed could fit our kids room - they were too "bulky", too. Also, most of the bunk beds we saw - even IKEA ones, were in the range of anywhere from $500-600, and went up all the way to $3,500 for www.casakids.com style of beds.

    At the end of the day, it's just a fun, enjoyable, DIY project for anyone with a weekend and a CNC on their hands... well, and obviously kids, too :)

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    charlessenf-gmyuriysklyar

    Reply 8 months ago

    "Better Homes and Gardens Leighton Twin Over Twin Wood Bunk Bed, Mu ... Walmart $179 "
    I got our last one from Big Lots. Apparently, they no longer carry that model. I recall it was about $180 before tax and w/o mattresses.
    Apparently prices in CA are higher and inflation has hit the Bunk Bed market!

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    tonyi

    8 months ago

    Great project, great work great finished product. i also particularly like the small scale tester to get it right without major fail and associated cost.

    Thats a serious CNC Router you have, a tad bigger then the typical home DIY CNC router.
    well done and thanks for sharing.
    Most Engineers, Deaigners & DIYers have lots of great ideas and projects to share & post about but don't getting the time to document & finaly post / share it.

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    yuriysklyartonyi

    Reply 8 months ago

    Thank you!!! You're absolutely right about the documentation - by far the most time consuming part of the project. Plus, it's not as fun as actually designing/building, which is probably why most don't get around to doing it. :)

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    TheBrokeHobbist

    8 months ago

    If you wanted to reduce waste as make this a one material project (finishing products aside) Instead of the 3D printed plugs make some trapezoid wedges out out some of the scraps,. If you make them the right size you could use a mallet to tap them in so they are nice and tight, but can always tap them out if you ever needed to disassemble the whole thing. Its an old joinery method but it works. I do like the 3D printed parts for the record.

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    yuriysklyarcharlessenf-gm

    Reply 8 months ago

    This is actually really clean - just had to google this particular one ;)

    I believe this approach might work really well for hardwood, not sure how it would perform with plywood.

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    charlessenf-gmyuriysklyar

    Reply 8 months ago

    If the tenons on the side pieces were split in the middle of the long dimension and the receiving 'mortise' through the end panels were cut (like a dove tail - narrow in the inside and wide on the outside) the sides could be fitted snugly and then secured by inserting the long wedge into the slot.

    In the image I found, two wedges were employed horizontally. If you imagine a single wedge inserted vertically you'll get a 'picture' of what I attempted to describe above.

    Easier written, I suppose, than programmed into a machine!
    I assume that, if I had access to a CNC machine, I could cut the through mortises precisely so the wedged side was so many sixteenths wider than the other side with the required angle such that, once the wedge was driven in, the side panel wold break before the tenon pulled loose

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    TheBrokeHobbistcharlessenf-gm

    Reply 8 months ago

    Kind of. More a slight variation on it. Instead of two strips into the joint, just one large one at the top that slides into the slot above the main piece. The nature of the build means he doesn't need to worry about his panels coming out unless they slide up.

    IMG_6007.jpg
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    charlessenf-gmTheBrokeHobbist

    Reply 8 months ago

    OK, I see what you were suggesting.

    I was thinking that the CNC machine could cut tapered slots for the side rails - maybe 2-4 degrees) - and the tenons on the rail ends could be slotted to accept a wedge that would lock the tenon into the side piece.

    Disassembly would not be as easy or 'tool less,' of course. Getting the wedge out - well, that would require skill and patience.

    Then again, I've had a couple Bunk Beds in my time. I bought them, assembled them, sold them and watched the buyers take them apart and home!

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    yuriysklyarTheBrokeHobbist

    Reply 8 months ago

    Tapping them out won't work in all the places. The design is such that the back side of these always gets completely covered, leaving you with either no opening or something very thin, like .5-1mm.

    In case you're interested in some of my reasoning for deciding to go with 3D printing, check my comment in the answers section.

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    TheBrokeHobbistyuriysklyar

    Reply 8 months ago

    Oh I read why you went with 3D Printing. I'm not saying suggestion would be better, I just wanted to add the suggestion for anyone considering your design in the future.

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    newrt001

    8 months ago

    Have you found ways to use all the cut out pieces? I see a nice round table top!

    1 reply
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    yuriysklyarnewrt001

    Reply 8 months ago

    Funny you mention - that was the first thing I though about when I saw it. This was a one off cut, the file has the top step placed in the circle to save on material.

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    PiotrS

    8 months ago

    this is genius way beter then Ikea + NO SCREWS OWSOME !!!!