3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: !functionalprint@kbin.social or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
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I believe that could be your main problem. 250 mm/s could be your default travel speed. What slicer are you using? Check all your speeds (travel speed, wall speed, infill speed, etc.)
In slicer you set desired max speed, but you are limited with accelerations and actual size of the model (distance). Printing speed will never be higher than speed you have set, but it can and it will be lower most of the time, depending what are you printing. So if you set 1000 mm/s it will not print that cube any faster. Printer needs some length and time to accelerate to max speed, then slow down before next corner.
Anyway its bad idea to push speed limits while having other issues, leave that for later. In my opinion, 20-30 mm/s is slow printing, 40-70 mm/s normal speed and 80+ fast printing. 100+ is almost impossible for most printers without losing a lot on quality. Check voron, they can push 150 mm/s easy, some even go above 200. Printing faster than 150 mm/s is available for well dialed printers and experienced users. My 2500$ ultimaker barely can do that and failure risk is much higher.
My advice, set speeds at ~60 mm/s or even lower (travel speed 150 mm/s). Find best temps and settings for your filament, try to get desired quality. Try higher speeds after that.
You didnt answer have you dried your filament. PETG tends to soak a lot of moisture and its almost mandatory to have filament drier.
For PETG you dont need higher speeds than PLA for sure. You need higher temps, better dialed retraction and dry filament. If you want to increase speed, you should increase temp accordingly.
If you are unhappy with your max speed, consider switching to 0.6 or 0.8 nozzle. If you need more help its best to provide all information you have (printer model, speeds, temps, filament, any upgrades on printer, etc) to make it easier for everyone.