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Thermos vial storage with 3D printed inserts and capacity options

79 replies21 peopleJun 2, 2026☆ Follow
Summary

How to adapt a thermos for vial storage using 3D printed inserts or alternatives while managing capacity and performance

Users report on thermos packaging quality and shift focus to 3D printing vial inserts, sharing model recommendations alongside warnings on size limits and beginner usability. Storage capacity is compared with and without the four inner containers, highlighting vial count trade-offs, while some succeed with custom or purchased inserts and others explore fitting alternatives or budget food containers. Adhesive suggestions appear for related uses, and cold retention is contrasted with other brands.

What this discussion establishesWhere people disagree

Cold retention performance compared to established brands

Still open

Printer suitability in humid environments, filament issues, larger thermos variants for specific vials, and sourcing inserts without personal printing

Nothing here is advice.

79 replies · 21 people · page 1 of 2
RustBeacon82archiveopening postJun 2

Found a food thermos online with four equal size containers inside. The containers match the height for 3ml vials if you skip the stainless liner bowl, and each has a gasketed lid that seals tight. Thirty seven vials fit in one without shifting, so four containers hold one hundred forty eight total. Filled one tray plus part of a second and used a paper towel to take up the empty space until the next batch arrives. The thermos is stainless double walled with a leakproof lid and came with a shoulder strap that is not needed for freezer storage. Just wanted to share this with the group.

PatientTimber12archiveJun 2

Saw some of these show up in my suggestions and have been thinking about trying one. Glad to hear it works for you.

RustBeacon82archiveJun 2
↳ replying to @PatientTimber12

Could not pass on trying it at that price point. This is the first version I have seen that uses four equal size inner containers and the build quality is better than expected.

PlainAlder11archiveJun 2
↳ replying to @RustBeacon82 (opening post)

I'm curious about the origins of those tops bearing labels.

RustBeacon82archiveJun 2
↳ replying to @PlainAlder11

Printed on an M2, they also offer clear versions. These are the twenty eight by fourteen millimeter rounds from the Niimbot site.

PlainBramble29archiveJun 2
↳ replying to @RustBeacon82 (opening post)

I have that same one and printed the inlays for it. Happy storing one hundred twenty eight vials across two thermos.

RustBeacon82archiveJun 2
↳ replying to @PlainBramble29

Already have two of the other brand with printed inserts and both are full now. Needed another option and this one works well as a lower cost choice.

PlainAlder11archiveJun 3
↳ replying to @RustBeacon82

I have two rolls as well. The round labels are difficult to peel from the print roll.

RustBeacon82archiveJun 3
↳ replying to @PlainAlder11

Guess my small fingers and nails make that part easier.

RustBeacon82archiveJun 3

Does your husband know he is now shopping there too? Never thought of that approach so next time my husband will place the order without knowing the details.

WryThistle17archiveJun 3
↳ replying to @RustBeacon82

He has no idea and would never order from there himself, so I figured I could order and just tell him later.

ClearKettle64archiveJun 3

It is nice that it takes up less room but I know the other brand is not made to go in the freezer.

PatientSignal60archiveJun 4

Is this mainly a storage container or does it actually hold cold temperatures well? Have you checked for temperature changes inside? Not every flask keeps cold the same way.

RustBeacon82archiveJun 4
↳ replying to @PatientSignal60

Not running any tests myself. It is a vacuum food storage container just like the other brand most people here already use in the freezer with their items. Twenty dollars if you want to test it yourself. I have read it is not recommended to freeze them with liquid inside because of expansion, but with a dry interior it seems fine. All the ones I see are rated for fridge use at least. Your choice.

PatientTimber12archiveJun 4
↳ replying to @PlainBramble29

Where did you find the files for the inlays? Went ahead and ordered one and now just need to print the inserts to hold the vials.

PlainBramble29archiveJun 4
↳ replying to @PatientTimber12

If you have a smaller thermos you will probably need to scale it down a bit.

RustBeacon82archiveJun 4
↳ replying to @PatientSignal60

PS did you take your name from the Dilbert cartoon? I love that series.

PatientTimber12archiveJun 4
↳ replying to @PlainBramble29

That file is for the other brand thermos. I already printed that exact set for mine and it works great. If you ever need help choosing a printer or troubleshooting prints I am happy to assist since I teach 3d printing for a living.

RustBeacon82archiveJun 4
↳ replying to @PatientTimber12

Are there any small ones worth getting? Space is very limited living on a boat but it would be useful to print an emergency part for a quick fix.

PatientTimber12archiveJun 4
↳ replying to @RustBeacon82

There are some small form factor printers that perform well but small is relative. How much space are we talking about? Check out the Bambu Labs A1 mini or the Flash Forge AD5X.

PlainBramble29archiveJun 5
↳ replying to @RustBeacon82

My son has the Bambu Labs A1 mini and we printed almost everything on it for a year. Then I found a good price on the A1 and bought one for myself so now we have two. On a boat the filament could pick up moisture from the air which leads to failed prints or surface issues.

RustBeacon82archiveJun 5
↳ replying to @PlainBramble29

Good point about the moisture. Thank you for the heads up. Humidity is definitely high here.

PatientTimber12archiveJun 5
↳ replying to @RustBeacon82

All filaments absorb moisture to some degree. If prints will be used outside especially in direct sun you will want a printer that can handle ABS or ASA. For indoor use regular PLA or PETG is fine. PLA handles humidity better than most though I have not tried it on a sailboat. ABS and ASA are very sensitive so a dryer box helps. I could talk about this for days but do not want to bore you. Feel free to message me with more questions.

RustBeacon82archiveJun 5
↳ replying to @PatientTimber12

Might not be practical on the boat with the space and moisture levels. Still going to research because my mom has plenty of room at her house.

PatientTimber12archiveJun 5
↳ replying to @RustBeacon82

There are some tricks to reduce the moisture problems but space would still be the main limit.

RustBeacon82archiveJun 5
↳ replying to @PatientTimber12

I may need to hire you someday for a random broken piece since everything breaks on a boat.

PlainBramble29archiveJun 6
↳ replying to @RustBeacon82

On our small sailboat the ceiling headliner is coming down because the glue from nineteen seventy three has failed and we do not know what adhesive will hold it back up in that environment. For filament I use a small dryer since the basement gets pretty moist in summer though winter is drier due to heating.

PlainAlder11archiveJun 6
↳ replying to @RustBeacon82

Nice. I stayed a few weeks on my aunt's forty five foot sailboat at a local marina.

RustBeacon82archiveJun 6
↳ replying to @PlainBramble29

What type of headliner material is it, vinyl or cloth? I know a few adhesives that hold up well in marine conditions.

RustBeacon82archiveJun 6

My bad if that came off as helping you keep at it. 😂

BrightLantern89archiveJun 6
↳ replying to @RustBeacon82

It turns out this item ends up being both what started the trouble and what resolves it what a puzzle

IronLedger65archiveJun 6

Received this item just now and it makes me happy. All of my special collection fits inside now instead of being divided between multiple other units. Those other units can now accommodate the small vials plus the additional compound. Due to its height it must be positioned horizontally within the freezing compartment however this causes no difficulty.

BrightLantern89archiveJun 6
↳ replying to @IronLedger65

I wondered how mine showed up and whether the item stayed undamaged along the way. Orders from those kinds of sites often come with wrapping that falls short.

RustBeacon82archiveJun 6
↳ replying to @BrightLantern89

The box arrived looking solid and secure inside its container. I couldn't believe there were no marks at all on it or the thermos when it showed up.

BrightLantern89archiveJun 6
↳ replying to @RustBeacon82

Got some plastic storage units to hold my peptide supplies but one showed up in poor condition.

RustBeacon82archiveJun 6
↳ replying to @IronLedger65

Thrilled that this method will suit you 😊 I've already divided my own using only Tirz too. The leftover items get placed into my pair of hydropeaks, with one for favorites and the other for everything else...haha

PlainBramble29archiveJun 8
↳ replying to @RustBeacon82

This seems like a vinyl item and I'd place its age at roughly a quarter century.

RustBeacon82archiveJun 8
↳ replying to @PlainBramble29

A spray glue worked fine for me when fixing the lining inside my refrigerator and it has stayed put through many years. This stuff would probably keep vinyl fastened tight even around boats.

BrightThistle70archiveJun 12
↳ replying to @RustBeacon82 (opening post)

Got the two thermoses in the mail today. Really thankful for the suggestion. The way they're put together is impressive.

RustBeacon82archiveJun 12
↳ replying to @BrightThistle70

Pleased you managed to get hold of two. It seems the budget options have now run out.

BrightLantern89archiveJun 12

It ended up working nicely in my favor. Usually the opening purchase comes cheap but follow ups run far higher. Here the first drawer unit arrived at a low cost while the next one cost much more and turned out damaged by chance. After taking it apart with heat and holding pieces together I got two working sets at the low price with delivery included. Even poor citrus can make decent lemonade.

ClearWillow59archiveJun 12
↳ replying to @PatientTimber12

Wow that gets me excited I'd like to join in. What's your take on a good printing machine?

PatientTimber12archiveJun 12
↳ replying to @ClearWillow59

Plenty of solid choices exist depending on the exact item being printed. Drop me a private note if you want some suggestions.

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