In this Instructable I'll show you how I made my foam mattress round from one side, and also made the support it had underneath match the mattress. I don't know how to modify a normal bed frame to match a custom mattress, my bed support comes from a construction site's lifting pallets.

My mattress is made from foam, but I suppose similarly and with a little imagination you could modify a mattress that is made from other material too.

I chose a half round shape because that fit my living room/bedroom best but as you'll see you can do any shape you like, the sky's the limit!! :)

Step 1: Materials and tools.

I include the instructions on how to modify the lifting pallets, this is of course optional. I strongly recommend some form of entertainment (laptop with films, tv, etc) during the sewing step, it's incredibly boring otherwise. With entertainment you just spend a fun afternoon.


- a foam mattress
- sewing thread to match the colour of the mattress
- lifting pallets for the bed to stand on (optional)


- scissors or small sharp knife
- marker
- big sharp knife
- (optional) knife sharpener (if your knife isn't sharp enough)
- sewing needle
- (optional) jigsaw (to modify the pallets)
- (optional) hammer, screwdriver or drill and wood screws (to modify the pallets)
- (optional) laptop or/and other entertainment (to keep you from getting incredibly bored through the sewing procedure)

Have you ever tried doing something like this with an inner coil spring mattress?
Actually i recently had to change my matress and i bought an inner coil spring one. I want to have the same shape so I'll have to modify this one too (i also don't want to lose the lovely bed underneath ;) ) <br>So yes, I'll make that into an instructable too, and thanks for the motivation to actually do it, i've been postponing it :)
Thanks for your reply! I ended up doing my &quot;Harry Potter bed beneath the stairs&quot; to fit in the odd-shaped basement room with a foam mattress after I realized that I'd never be able to flip a spring-based mattress since the shape is sort of like a lazy &quot;L&quot;, and flipping it would no longer fit the space since it is so asymmetrical. With a memory-foam based mattress, you can't flip it, see? And now I get to take advantage of the fact. <br> <br>It took a new full memory-foam mattress with a zip-style removable cover, a sharp fishing fillet knife, and a lot of playing with autocad online to get the dimensions and weird angles perfect. <br> <br>This was a great instructable and really saved my bacon (and potentially my back). Thank you!
Thank you that's really nice to hear :) <br>Could you maybe put a picture of that crazy L shaped understairs mattress job? I'm curious to see how it turned out. So you meant that you don't *have to* flip a memory foam mattress? i know nothing about those ones, i do know one definitely has to occasionally flip the spring coil ones...
where can i get 4 inch foam bedding cheap ?
depends where you live, every town has their cheap matress provider :P
I'm going to have to do this!<br /> ever since i saw a circle matress at IKEA i've been lusting for one.<br /> thank your this!!!
&nbsp;Cool! Feel free to post result photos here :)
You could have gone for heart-shaped... L (great)
hey, cool! the tutorial's great! so elaborate that one might get the impression you put the same effort on it than on the actual matress job! ;) the description of the "optional" tools just made me laugh a bit, it's like saying "for this you can use a simple household watch, optional use an atom powered time bending device!" ;) btw: this site really IS awesome!

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