PETG to -18°C ?

[Nigel Crompton]

Were I to need to print something to withstand domestic freezer temperatures would PET-G do, or will I need something more esoteric ?

It's essentially a mould in which to freeze home-made "ready meals" to subsequently re-heat (sans mould!) in the camper's air-fryer. After freezing the food would be released from the mould and bagged for storage.

(Searching G. for "PET-G" & "temperature" produces the predicable, nozzle related results)

 

[olley]

Not recommended below -40c

 

[Nigel Crompton]

Ah, that'll 'do' then; another argument to put to the Accountant ...

 

[Guigsy]

You need to consider whether the material will flex enough at -18C to deal with ice expansion. And if it's food safe.

 

[Nigel Crompton]

You need to consider whether the material will flex enough

Good point ..

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[PaulandChrissy]

PET-G is food safe, but, it will probably crack at -20c. Try it. What can you loose.
Might try it myself actually.
Making a box now to fill with water and putting it in the freezer.

 

[Nigel Crompton]

Making a box now to fill with water and putting it in the freezer.

Attaboy, I don't have the facilities (yet ... )

 

[PaulandChrissy]

Attaboy, I don't have the facilities (yet ... )

Just put a small container in the freezer full of water as a first test. If it survives, I’ll make a bigger one.

 

[Guigsy]

Put the food (or test water) in a freezer bag first. Before you put it in the mold. Then you don't have to worry about safety, leaks, or cracks.

 

[Nigel Crompton]

Put the food (or test water) in a freezer bag first. Before you put it in the mold. Then you don't have to worry about safety, leaks, or cracks.

Good idea, but it'll not work for a Shepherd's Pie or Lasagne ...

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[PaulandChrissy]

You could lay cling film over the mould before placing your grub in it.This will make it easier to separate from the mould after freezing. If the cling won’t come away from the grub, just pour a little warm water over it to release it.
My tester is freezing up nicely. Will take it out in the morning.

 

[PaulandChrissy]

Test 1. A little 3D printed PETG container 80mm diameter and 25mm tall filled with water in the freezer for a day survived very happily. The shape of the container is important for ejecting the frozen food. Sloping sides to allow it to slip out is important. No cling film was used. It took a little warm water poured over the bottom to get it out. I think cling film laid in the container first might have made it easier to get out. Will try that next time. Will try a larger container when I get a chance.

 

[Nigel Crompton]

Test 1. A little 3D printed PETG container 80mm diameter and 25mm tall filled with water in the freezer for a day survived very happily. The shape of the container is important for ejecting the frozen food. Sloping sides to allow it to slip out is important. No cling film was used. It took a little warm water poured over the bottom to get it out. I think cling film laid in the container first might have made it easier to get out. Will try that next time. Will try a larger container when I get a chance.

Thanks for that. As our air-fryer has a more-or-less rectangular compartment I would, ideally, be interested in how a container with 90deg corners fares .......

 

[RedFrame]

Would it not be cheaper to use and reuse plastic containers of the sort used in Chinese takeaways?

Cheers
Red.

 

[PaulandChrissy]

Would it not be cheaper to use and reuse plastic containers of the sort used in Chinese takeaways?

Cheers
Red.

Definitely would.
I think maybe specific sizes are needed ?

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[Nigel Crompton]

Our camper airfryer is 3.8lts.
We've been using tinfoil containers until now - we just throw them into the gas oven after de-frosting. Job done. But they don't fit the air-fryer.
(Bambu Labs have some hefty discounts atm )

 

[PaulandChrissy]

Thanks for that. As our air-fryer has a more-or-less rectangular compartment I would, ideally, be interested in how a container with 90deg corners fares .......

90deg sides woul make it a real problem getting the grub out. You would have to flex the container and it will most certainly crack.

 

[PaulandChrissy]

Our camper airfryer is 3.8lts.
We've been using tinfoil containers until now - we just throw them into the gas oven after de-frosting. Job done. But they don't fit the air-fryer.
(Bambu Labs have some hefty discounts atm )

Bamboo labs are really good machines. I’m a Prusa man though. Been with Prusa machines before Bamboo Labs appeared on the market. All my spare parts for my machines are mostly interchangeable, so Prusa makes sense for me. Went to the factory in Czech republic this summer. Amazing.

 

[PaulandChrissy]

Is it not easier to find a nylon container that’s indestructible on Amazon or eBay. Probably a more suitable route to take. And cheaper.

 

[jumar]

I've picked out key words from this thread...but to be honest...what you guys talking about..,

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[PaulandChrissy]

Will PETG survive-20c basically.

 

[Nigel Crompton]

I've picked out key words from this thread...but to be honest...what you guys talking about..,

Originally: does the PETG filament used in 3D printers withstand -18C without cracking up.
It's gone a bit OT since ...

 

[Guigsy]

Bamboo labs are really good machines. I’m a Prusa man though. Been with Prusa machines before Bamboo Labs appeared on the market. All my spare parts for my machines are mostly interchangeable, so Prusa makes sense for me. Went to the factory in Czech republic this summer. Amazing.

I had a Prusa Mk2. It was a massive upgrade from my string and plywood Printrbot. I should have kept it up to date, but it just kept soldering away. And update kits are no longer available... and are probably pointless anyway as I'd have to change so much.

I got a Bambu Labs P1S with the AMS about a year ago. It's amazing. Incredibly fast. And so reliable that I don't even bother checking that it's started printing. No, I'm not keen on the fact it's a closed garden and not open source. But they do sell spares and they're pretty reasonably priced. Not that I've needed it so far.

I've given my old Prusa to my dad. He needed a hobby. Mum says if she can hear the printer whining away, she knows he's keeping out of trouble.

 

[PaulandChrissy]

I’ve had a PETG container in the freezer for a good few days now. It’s fine until you try to remove the frozen block of grub. To get the grub out involves a bit of flexibility in the container, and -20 PETG just won’t cut it reliably.