Walk into my print room on a hot summer afternoon and you’ll notice one thing straight away: it’s warm. Really warm.
With multiple 3D printers running throughout the day, room temperatures can easily climb well above normal household temperatures. Over the past few weeks I’ve been monitoring temperatures in our own workshop, and it got me thinking about one of the most common questions people ask during summer:
Can hot weather affect my 3D prints?
The short answer is yes. But probably not in the way you think.
Your Filament Is Not Melting
One of the biggest misconceptions is that a reel of PLA sitting on a shelf will suddenly melt when the weather reaches 30°C.
Thankfully, that’s not how it works.
PLA typically starts to soften at around 55°C to 60°C. Even during a heatwave, most homes and workshops won’t reach those temperatures. However, problems can still occur long before the filament reaches its softening point.
Heat and Humidity Are the Real Problem
As temperatures rise, humidity often rises too.
Many printing materials absorb moisture from the air, including:
– PLA
– PETG
– Nylon
– TPU
– ABS (to a lesser extent)
When filament absorbs moisture, you may notice:
– Increased stringing
– Popping or crackling sounds during printing
– Rough surface finishes
– Weak layer adhesion
– Reduced print quality
This is why a reel that printed perfectly in spring can suddenly become frustrating during the summer months.
What Happens Inside the Print Room?
In our own workshop, we run multiple printers throughout the day. Each machine generates heat, and that heat has to go somewhere.
Without proper airflow, temperatures can quickly build up.
A hotter room can cause:
– More difficult cooling for PLA
– Increased stringing
– Longer cooling times
– Greater wear on electronics and motors
– Uncomfortable working conditions for operators
Interestingly, some materials actually benefit from a warmer environment.
ABS and ASA generally prefer stable, warmer conditions because they are less likely to warp when the surrounding temperature remains consistent.
PLA, however, often prefers good airflow and effective cooling.
Should You Worry About Your Printer?
Most modern printers are designed to operate in warm conditions.
The bigger concern is not usually the printer itself. It’s the environment around it.
Ask yourself:
– Is fresh air entering the room?
– Is hot air able to escape?
– Are filament reels stored correctly?
– Are electronics being exposed to excessive heat for long periods?
If the answer to any of those is no, it might be worth making some changes before temperatures climb further.
Simple Ways to Protect Your Filament
You don’t need expensive equipment to improve your setup.
A few simple changes can make a huge difference:
Store filament in sealed containers
Plastic storage boxes with silica gel work surprisingly well.
Keep reels away from direct sunlight
A reel sitting in a sunny window can heat up much faster than the room around it.
Use filament dryers when needed
Particularly useful for PETG, TPU and nylon.
Improve room airflow
Even a basic extraction setup can help remove hot air and keep temperatures more stable.
Rotate stock regularly
Older reels that have been sitting open for months are more likely to absorb moisture.
My Experience Running Multiple Printers
With over a dozen printers running regularly, summer is definitely the most challenging time of year.
The prints themselves are usually fine.
The real challenge is managing the room temperature, maintaining airflow, and keeping filament dry enough to perform consistently.
As your printer collection grows, these factors become just as important as your print settings.
Final Thoughts
If your prints suddenly start stringing more, looking rougher, or behaving differently during hot weather, don’t immediately assume your printer settings are wrong.
Sometimes the biggest change isn’t your slicer profile.
It’s the environment around your printer.
A little attention to storage, airflow, and temperature management can often solve problems that hours of troubleshooting never will.
Have you noticed a difference in your prints during warmer weather? I’d love to hear about your setup and what has worked for you.
