Unlock Perfect PETG Prints: Speed & Temp Guide for Nozzle & Bed

In the world of 3D printing, PETG is quickly becoming a favorite among enthusiasts. The discovery of its unique properties has piqued the interest of many. Yet, one commonly asked question remains: What’s the optimal printing speed and temperature for PETG filament? The truth is, these settings can vary based on the specific PETG brand and the 3D printer in use. As a general rule, a printing speed of 50mm/s, nozzle temperature of 240°C, and bed temperature of 80°C works wonders. Don’t forget to peek at the spool, as many PETG brands list their recommended settings right there! This gives you a solid starting point, but let’s dive deeper into understanding the nuances of PETG printing.


Discovering the Ideal Printing Speed for PETG:
The sweet spot for PETG filament printing speed usually ranges from 40-60mm/s on most standard 3D printers. If your 3D printer is well-calibrated and boasts good stability, you might even achieve higher speeds without sacrificing print quality. A calibration tower can be your best friend, helping you discern quality differences at varying speeds. Some 3D printing enthusiasts have achieved commendable PETG prints even at 80mm/s+. Given PETG’s resilience and slower melt rate compared to other thermoplastics, pushing the speed too high isn’t recommended unless your hotend melts filament with high efficiency. Interestingly, Cura presets a default printing speed of 50mm/s for PETG, which generally aligns well with most users’ needs. And remember, it’s wise to keep the first layer speed a tad slower to ensure optimal bed adhesion and a solid base for your print.

Different components within your print may demand varied speeds, such as:
– Infill Speed
– Wall Speed (Both Outer & Inner)
– Top/Bottom Speed

These speeds, by default, adapt to either match the primary print speed or remain at half the value, allowing for tailored adjustments. Owing to the significance of certain sections (like the exterior), slower speeds usually yield superior surface quality.

PETG’s Nemesis – Stringing:
One frequent hiccup with PETG is the pesky stringing – those annoying thin strands that sometimes appear on prints. Reducing the print speed can be a remedy, improving the overall print quality. Some users, especially those using OVERTURE PETG, suggest a speed of 45mm/s for intricate prints and 50mm/s for larger designs. Slower speeds are advantageous for complex models, while the Initial Layer Speed plays a pivotal role in ensuring the first layer adheres well. Cura, for instance, defaults to 20mm/s irrespective of the primary print speed. By experimenting between 30-85% of your primary speed for the initial layer, you can discover what’s perfect for your machine. Moreover, maintaining a decent Travel Speed can mitigate stringing, so keeping it around 150-250mm/s (depending on your 3D printer’s sturdiness) can be beneficial.

Decoding the Perfect Printing Temperature for PETG:
The ideal nozzle temperature for PETG generally hovers between 220-250°C, contingent on filament brand and the specific 3D printer setup. For instance, SUNLU PETG recommends 235-245°C, while HATCHBOX PETG ranges from 230-260°C. It’s vital to gauge the surrounding environment, the precision of your temperature sensor, and other aspects. Different 3D printers might slightly alter these temperature recommendations. It’s wise to print a Temperature Tower to gauge the optimal temperature setting for your setup.

The Best Bed Temperature for PETG:
Generally, the most effective bed temperature for PETG lies between 60-90°C. Given PETG’s glass transition temperature of 80°C, it’s crucial to find the right balance. Some achieve great results with just 30°C on the bed using adhesive solutions, while others prefer a warmer 90°C.

The Optimal Ambient Temperature:
To achieve the best PETG prints, maintain an ambient temperature between 15-32°C (60-90°F). Consistency is key; drastic temperature shifts can be detrimental. An enclosure, like the Creality Fireproof & Dustproof Enclosure, can offer a controlled environment, ensuring consistent quality.

Finding the Right Fan Speed for PETG:
Fan speeds can vary from 0-100%, depending on your desired outcome. If surface quality is your priority, opt for a higher cooling fan speed. However, for better layer bonding and durability, a lower speed is more apt. Fans play a crucial role in ensuring PETG prints’ overhangs and bridges are precise.

Layer Heights and PETG:
For a 0.4mm nozzle, the recommended layer height for PETG ranges from 0.12-0.28mm. Intricate designs benefit from a 0.12mm layer height, while quicker, robust prints are achievable at 0.2-0.28mm. It’s commonly advised to avoid very low layer heights like under 0.1mm for PETG. To circumvent the effects of microstepping in your Z motors, consider using layer heights in 0.04mm increments.