Prototype Sputnik - a 7.5L HTPC

Shatrod

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Hi Everyone.

I have been away for a bit but figured its time i come back and share what has been occupying my free time as of late. I have been designing a simple 7.5L HTPC case with a focus on storage. My design goals were simple: don't use any risers or extensions, design around standard sff parts (sfx psu mostly), support a few drives, have some front IO, and look good in a living room :)

I feel like I mostly have what I set out to make. The sheet metal design is almost done, just needs to be triple checked and I will start looking at manufacturers near me to prototype with.
I already designed and prototyped the front IO PCB. The case sports two usb3.0 ports running full usb 3.0 speeds, and a cherry switch for power button.
For storage you can fit four 2.5" drives. Max GPU length is 204mm with 2.25 ish slot thickness. Although an SFX-L psu will fit, the vents are only designed to accommodate an SFX.
The cpu cooler is limited to 65mm tall, but really that will choke the fan. Practically I can only see this working with around 45mm tall coolers.
To help with cooling a 120mm fan can be mounted in the front.

Without further delay, some renders and pictures. Let me know what you think!
Update march 2024: first prototype is made!

Update August 2024:
I decided I want to try to do this for real and try to bring it up as a low volume product. To that extent I had to put the project on a small hold while I started building up supporting infrastructure. I opened a sole proprietorship in my province and built a website to host my current and future work. You can check it out below, as well my Instagram redshift.project. I also added hardware compatibility graphcis to this post.


For the case itself, i did notice some minor tweaks need to be made. Some of the screw holes don't line up perfectly (though they are so close i didn't notice until i was auditing the cad model, the actual prototype it was not evident at all). Im also battling with some tolerance issues with the wood. I need to make a bunch of prototypes tweaking the wood slightly until its a good fit every time. I also chose not to 3d prin the button but isntead go for an off the shelf keycap. I also need to see how to best tweak the front IO PCB. It works but, it could be better/easier to make. I will also be finishing the last 3 prototypes.







Update February 2025:
The prototypes are finished, with the front panels made with australian burl and colored resin. I am still tweaking the deisgn for a small volume production batch, more details on that in the feb 11 post below. Two of these resin prototypes are also for sale on my website if you wanted to grab one! Specifically the blue and purple one! https://redshiftproject.com/pages/sputnik-sff-case



I also put together a build video:


















 
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Shatrod

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Dec 6, 2019
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Small update. I have been talking to a few manufacturers and am zeroing in on a local one that is reasonably priced. I do have to update the design for manufacturing. Mainly, the front vents need to change from the concentric wedges to the same slots as the top. I also extended the same methodology for the back. All in all, i am happy with the updated look, i don't think it detracts from the theme at all.

 

Shatrod

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Dec 6, 2019
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Hi all.

It's been a few months but I'm excited to share a big little update. I got the first prototypes made!


Still need to powder coat, assemble, make the wood front, get screws and other trimmings but we're getting there! Hopefully fitment test and first build soon.
 

Shatrod

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Big update, the first prototype is fully made.
I CNCed the wood front, sourced all the screws (they are very flush). The whole case came together perfectly. I will also be editing the first post to reflect that this not just a render anymore :) First build coming soon to test hardware fitment. Here are some pics:









As well as some in progress photos of making the wooden front:
 
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ASAP

Minimal Tinkerer
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Mar 10, 2024
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This is an intriguing layout. How well does the GPU cooling work with the card upside down? Is there room for a radiator and fan on the front to be used in conjunction with a pump/res waterblock combo?

Great job, it looks awesome!
 

Shatrod

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Dec 6, 2019
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This is an intriguing layout. How well does the GPU cooling work with the card upside down? Is there room for a radiator and fan on the front to be used in conjunction with a pump/res waterblock combo?

Great job, it looks awesome!
Thanks!

I haven't done extensive testing just yet, but if my understating is right the GPU cooling should work fine in this orientation. As far as vapor chamber/heat pipes are concerned it's the same as the usual way. And convection really shouldn't play that much of a role if you have fans going. The vents wrap around the sides specifically to let GPUs exhaust out the sides if your fin stack points sideways.

There is definitely no room for a radiator. Motherboard to front panel clearance is 30mm. Works out to be just enough for a standard fan and the 24pin cable clip.

I think the length width and height ratios make the case appear bigger than it really is.
 

Shatrod

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Dec 6, 2019
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Update August 2024 (also updated first post):
I decided I want to try to do this for real and try to bring it up as a low volume product. To that extent I had to put the project on a small hold while I started building up supporting infrastructure. I opened a sole proprietorship in my province and built a website to host my current and future work. You can check it out below, as well my Instagram redshift.project


I also made some GPU display stands, which are available for purchase now. I am hoping to use that product to build up a bit of a brand and to subsidize the case development as its becoming a little difficult to prototype things out of pocket. I am now getting back to the case itself and trying to put in the last 10% of the effort to polish everything off. Here is a list of TODOs:

1) clean up the CAD model. I noticed while auditing it that some screw holes don't perfectly line up but its so close that i didn't notice on the real thing while building the prototype.
2) tweak the design of the wood front. It will visually stay the same, but I need to work in better tolerance control. When this becomes a small volume thing I don't want to be hand sanding every single piece for fitment. Also depending on the choice of keycap, the square cutout can be too tight and the keycap can get stuck. I also need to address that.
3) keycap itself. 3d printing it has proven to be not great, and they're not expensive, so il probably use an off the shelf keycap. X D A profile.
4) the SSD bracket needs a bit of tweaks. I am a little concerned about SSDs touching the gpu back plate and shorting things if there is no back plate... so i think il extend the plastic there to act as a bit of a shield for isolation. On the flip side, the plastic then touches the back plate which could get quite hot? Or not really given the size constraints. Basically this needs testing, but i dont want to start shipping cases until I can get a chance to test it. I need to get my hands on the gigabyte 4070 dual fan that (maybe) fits in this case as its the hottest card i can think of to test this with.
5) tweak the IO PCB. Specifically the low profile usb internal cable is a pretty hard item to find. I need to find one that only has the connector on one side so i can solder it directly to the PCB. This makes it even lower profile and eliminates some connectors. I also want to look into pcb assembly services. I can see myself soldering on a few usb ports for prototyping but not hundreds for production.
6) (optional) thermal and noise testing. I think it not required but would be nice to make a "representative" build to push this case to the limit and do some temperature and noise testing. Is this something you would like to see? What would in your opinion be good hardware to use?
 
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Shatrod

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Hi All, been a bit of time since the last update. Things have been slow but I have some news.

In reference to my previous update:

1) The CAD model clean up is almost done. I went out of my way to re-model my reference motherboard and gpu using the actual pcie electro-mechanical specs as a guide, instead of trying to measure stuff with calipers. Plugging those into the case model i saw a handful of issues that still need to be tweaked out, but this is well underway.
2) i finished the remaining prototypes with a tweaked design for the wood front, and as an added bonus made the fronts epoxy rivers in burl. This is just for the prototypes to give them a little extra wow factor, as it was insanely labour intensive to do this. But now they are truly one of a kind units. The major update to the wood was an enalrged opening for the power button so an off the shelf keycap can move freely.
3) Definitely using off the shelf keycaps.
4) Upon doing a few more sample builds and trying it out with an actual 2.5" SSD, i am not as concerned. Leaving this part the same.
5) I decided to completely abandon the IO PCB. I ordered (and am still waiting for samples to arrive) an ADT link usb3.1 internal cable, with a type e connector. This completely eliminates the need for me to manufacture and solder the finicky usb cables, and the IO becomes a plug and play off the shelf part. The only soldering that remains is for the power button on the cherry switch, but thats comparatively very easy.
6) Although i did do another representative build with a ryzen 5600x and an RX6600, I did not yet have time to collect temperature metrics. I can say its not throttling, and its not crazy loud.

Now, onto the big news for Feb 11 2025:

The complete prototypes with the resin and burl fronts:










The White resin is my HTPC and is the case i used to do a sample build, which i recoreded and tried to make a build video of:


And, the most exciting news, the blue and purple resin versions are for sale on my website!
What you will get in the box is the case, disassmbled. All the necessary screws to put it together. 4 keycaps - white, black and gold XDA profile caps as well as a koi fish artisan keycam for your keybard to match the theme if you wanted to. Blue case with blue cap, purple case with purple cap. Also included is the 2.5" SSD tray, 3d printed, and all the IO and internal USB cables hooking up to the front pcb.


Thanks everyone for looking, let me know what you think of the video and resin work. It was my first time trying to film and edit something.
 
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ignsvn

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Man that's beautiful. You do resin work as well?

I read more about resin from articles about artisan keycaps, and one of the steps the creator do is removing air bubbles. They often use vacuum tank to do this.

Is air bubbles also an issue with something on a larger scale like yours?
 

Shatrod

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Dec 6, 2019
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Man that's beautiful. You do resin work as well?

I read more about resin from articles about artisan keycaps, and one of the steps the creator do is removing air bubbles. They often use vacuum tank to do this.

Is air bubbles also an issue with something on a larger scale like yours?
Thanks! I did resin work first before I got into cases. Woodworking is a hobby albeit not one I do frequently anymore.

I did have to buy a vacuum chamber and pump specifically for this project to degass the resin, but only because of the clear pour. Normally I wouldn't bother because I would just use mica powders for color, which would ultimately look opaque and hide the bubbles.

These prototypes were a 3 step process: 1) paint the burl part gold and seal it with some resin (just brush on). 2) Do a color pour which is the mica powder one, but only about 1/3 of the way. Wait for it to set. 3) do a clear pour. This clear part needed degassing but it gives the whole panel depth so I think it was well worth it. I also neglected to mention the milling sanding and polishing of the clear part. Overall, insane effort. Never doing it at scale this way. Just opaque color resin... Maybe.
 
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ignsvn

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Thanks! I did resin work first before I got into cases. Woodworking is a hobby albeit not one I do frequently anymore.

I did have to buy a vacuum chamber and pump specifically for this project to degass the resin, but only because of the clear pour. Normally I wouldn't bother because I would just use mica powders for color, which would ultimately look opaque and hide the bubbles.

These prototypes were a 3 step process: 1) paint the burl part gold and seal it with some resin (just brush on). 2) Do a color pour which is the mica powder one, but only about 1/3 of the way. Wait for it to set. 3) do a clear pour. This clear part needed degassing but it gives the whole panel depth so I think it was well worth it. I also neglected to mention the milling sanding and polishing of the clear part. Overall, insane effort. Never doing it at scale this way. Just opaque color resin... Maybe.

Aye and since you mentioned clear (or translucent) resin, you can try to add LED behind it, it would look cool!
 
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Shatrod

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Aye and since you mentioned clear (or translucent) resin, you can try to add LED behind it, it would look cool!
The power button led actually floods it a little bit. It's not really a full backlight though. The full backlight would be amazing I agree.

This looks really niceee! Are you located in the UK?

edit: lol nevermind, just saw you're not
Nah, ex colony. 🍁
 
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ignsvn

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This looks really niceee! Are you located in the UK?

edit: lol nevermind, just saw you're not

There's always international shipment :)

And if you just want to have a wood + resin front plate, it shouldn't be too expensive
 

Shatrod

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This is true. If you just want a wood and resin cover for your case shoot me a message. I'm sure we can work something out
 


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