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Raspberry Pi Forum The tale of two metal cases: A Raspberry Pi 3B+ metal case review
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The tale of two metal cases: A Raspberry Pi 3B+ metal case review

colporteur
colporteur over 5 years ago

Are you in the market for a metal case to enclose your Pi? The following article is a comparison of two metal cases from two different manufactures. The review is not designed to make a recommendation but rather to share anecdotal information obtained after the purchase and assembly of the cases.

 

A members post on Element14 (can’t find the link to give credit) regarding Raspberry Pi full metal cases that double as heat sinks piqued my interest. I proceeded to Amazon to do a search and purchase two different cases for a Pi3B+. I pretty sure the units I have were not the cases the article mentioned. I went for a lower price point than the cases mentioned in the article. One case I will refer to as a Passive Armour case (PAC) and as an Active Armour case (AAC). What makes them passive and active is the active case has two fans, the passive has no fans.

 

imageimage

 

On average the cases purchased were around $15 Canadian. The PAC slightly less by a few bucks, the AAC slightly more by a few bucks. Hey fans cost money I guess.


The PAC unit is manufactured/distributed by Geekworm. The AAC unit is manufacture/distributed by iUniker. Both units were purchased from Amazon and shipped to a postal drop in the US to avoid additional charges to receive them in Canada.


I have provided a slide for each unit, post shipping package opening. A few differences to note. The PAC unit uses hex screws and the AAC unit uses philips screws. The PAC unit provides an Allen key to install the screws. Both units provide what appears to be thermal pads to bridge the air gap between the case metal and the Pi chips. The PAC unit provided one additional pad. The AAC unit provided one additional screw.

 

image

 

Installation of a Pi in each case was basically the same. Apply the self sticking thermal pads to the raised metal on both sides of the case. There are three points of contact between the case and the Pi chips. Two on the top and one on the bottom. Position the Pi over the bottom half, align the top half over the Pi and insert the retaining screws and tighten. The two metal sides are pulled together with the Pi board sandwiched in between. A quick look between the sandwich with a light doesn’t show any air gap (i.e. light passing between) between the case and the Pi chips.

image

 

I completed the assembly without RTFM. The PAC had an instruction paper with links to more detailed instructions. I didn’t following the link. The AAC had an instruction card and very detailed pictorials on the box the case was shipped in. The PAC unit was shipped in a small bubble pack sleeve while the AAC had multiple foam layers in custom cutout sections.

image

 

Now for the meat of the review. The PAC case provides access to the four pins for the POE header and the AAC has them buried with no access. I can only assume you can still fit jumpers under the case but I haven’t tried.


As for other connectors they are all accessible. I suspect you would need to weave the small ribbon cable for a camera through the slot in the metal case before assembling the case sandwich. Both units don’t provide sufficient space to close these connectors once assembled. GPIO pins 4 & 6 are assigned by the manufacture to power the fans on the AAC unit.

imageimage

 

All connectors on the sides of the Pi are exposed and are well clear of the case. Pictures are provided to give the reader a all round view.


The fans on the AAC case start up as soon as power is applied. They are very quiet even when sitting on a case is sitting on a solid surface to act as an amplifier.


I’m not going to try and define what unit is better. The only major difference, other than passive and active is ease of access to the GPIO pins. The PAC unit provides and extender the AAC does not. If you are not using a ribbon cable to access GPIO pins then that pose a problem. If you are going to require a ribbon cable, you will need to find a cable that can fit in the narrow gap between the case and GPIO pins.

 

 

Sean

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  • shabaz
    shabaz over 5 years ago

    Hi Sean,

     

    It's surprising if it doesn't affect the wireless much, did you notice it to be significant, or is the impact small? It's possible the metal could de-tune the antenna, because it is just millimetres away in the last photo.

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  • neuromodulator
    neuromodulator over 5 years ago

    I read somewhere that one of those had non thermal conducting adhesive stickers. Did you perform any tests to see how much they affect temperature? Did you also notice any wifi link quality reduction?

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  • genebren
    genebren over 5 years ago

    Very cool!  I really like the idea of a robust metal case/heat sink combo.  I might have to try this out.

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  • colporteur
    colporteur over 5 years ago in reply to neuromodulator

    G'Day,

    I have buggered something in notifications that has orphaned me in terms of being notified someone has made a post. I apologize for my tardiness.

     

    I will respond to your sticker question and the wifi that shabaz commented on. Both units came with thermal conducting adhesive stickers. One side of the sticker attached itself to the metal case and the other side after removing the protective covers had a shinny silicon look almost like it was wet. I haven't done any extensive heat testing. Anecdotal evidence indicates I don't see the thermometer appear lately when I have been using the Pi3B+ in projects.

     

    I haven't done any wifi tests. I just took one of the units and switched it to wifi and removed the wired connection. I am doing some GNU Radio testing with the unit. I let you know what I experience..

     

    Sean

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  • mfetting
    mfetting over 5 years ago

    I would like to see a desktop case that allows expandability with one or more hats.

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  • clem57
    clem57 over 5 years ago in reply to colporteur

    I got the one with the fans from Amazon and so far like it. But I have another Pi 4 without a case.

    Clem

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  • mp2100
    mp2100 over 5 years ago

    I like the looks of the two cases, I assume they are anodized aluminum, since they are dark?  I have a Pi 3 B+ running in this case from Microcenter.  It's hard to tell from the photo but there is a piece that slides off to exposed the GPIO pins.  The Pi3 slides in from the end, and then the cover is screwed on to hold it in place.  The wifi does work well even though there is aluminum surrounding the entire board.  I hadn't thought to do a wifi distance testing comparison with it until reading this discussion.

    image

    This one is not for a newbie though, there's no insulating parts provided with it, I used my own nylon stand-offs to prevent anything from shorting out.  Because there's no physical connection to the pins, the heat is drawn away through natural convection inside.  I especially like it in winter, because the case gets pleasantly warm as it conducts the heat away, making it a nice hand warmer.

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  • colporteur
    colporteur over 5 years ago in reply to mp2100

    Hand warmer you say. The local ice arena is two blocks from my house. I usually come home from watching a hockey having to get a shower in order to warm up. What gauge of wire will I need to run a plug from my house to the arena? image Aah never mind. It is easier to buy a cup of tea and wrap my hand around the Styrofoam cup.image

     

    Sean

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