Advanced 3D Printing with PETG - Makenica 3D

What is PETG?

PETG is a glycol-modified variant of PET (Polyethylene Terephthalate) and the most popular material in the PET family of plastics for 3D Printing services. The glycol in PETG offers improved printability and toughness compared to other PET copolyesters making it the most suitable variant for online 3D printing services. Due to the benefits and popularity of PETG, it is uncommon to print pure PET filaments at 3d Printing companies.

PETG offers improved mechanical and thermal properties when compared to PLA, while maintaining excellent printability and reliability at a good 3D Printing quote. Although not a direct replacement for ABS, PETG is a great choice for users who experience difficulty printing ABS due to warping or cracking and require improved mechanical properties to PLA with excellent dimensional stability to 3d Print online.

PETG exhibits a low chemical resistance and moderate temperature resistance, softening at 80°C (Glass Transition and Vicat temperature).

PolyMax™ PETG is a nano reinforced PETG material exhibiting superior impact resistance and ductility when compared with regular PETG, PLA and ABS filaments for 3D Printing services in India. Combining superior performance and printability, PolyMax™ PETG is an excellent material for a wide range of functional applications requiring durability, ductility, stiffness, and near-zero warping on a wide range of printers for 3d Printing online.

PolyMax™ PETG exhibits the same chemical resistance and temperature resistance as quality PETG filaments.

Recommended settings are the same as regular PETG and we use the same settings for both PolyMax PETG and regular PETG.

Requirements

An enclosed professional 3D printer is not required but will be beneficial when printing PETG. We recommend only printing with a quality PETG filament.

Minimum Extruder Temperature – 230°C (±10°C)  is required (Correct temperature will vary on your printer)

Heated Bed – Required, 70° – 85°C.

Enclosure – Not required but recommended for best results.

Part Cooling Fan – OFF or LOW

Feeding / Spooling – No specific requirements.

Other Notes – N/A

Some 3D printing slicers (software) have a pre-configured PETG or CPE profile. The accuracy of this profile may vary depending on if you are using 1st or 3rd party filament. If a PETG or CPE profile is not available, we recommend duplicating a PLA or ABS profile to start with and making necessary adjustments covered in this article for 3d Printing Bangalore.

PRINTER SETUP 

As a general tip we recommend avoiding long and complicated feeding paths that can cause bends in the filament, this can introduce drag on the filament that may result in difficulties feeding and extruding while 3D Printing in Bangalore.

If you typically have issues with moisture in your filament, you can read our tips and comments on filament storage to determine if a dry box will be beneficial while online 3D Printing India.

• Changing between two PETG materials:

If the printer is currently loaded with a different PETG material, unload that material at 230-240°C and extrude your PETG filament at the same temperature. Stop extruding the PETG filament after the previous color is completely purged while 3D Printing in India.

• Changing from a higher temperature material:

If the printer is currently loaded with a higher temperature material, unload that material at its recommended printing temperature, and then load and extrude your PETG filament at that same higher temperature. It is important to load the PETG at this higher temperature so the previous material can be pushed out.  Stop extruding the PETG filament after the previous material has been completely purged and cleaned out, lower the temperature to 230-240°C, and extrude the PETG plastic for a few more seconds while performing 3D Printing service in India.

• Changing from a lower temperature material:

If the printer is currently loaded with a different lower temperature material, unload that material at its recommended printing temperature, and then load and extrude your PETG filament at 230-240°C. Stop extruding the PETG filament after the previous material has been completely purged and cleaned out. 

Printing with the right bed surface is very important when printing PETG, offering affordable 3D Printing services. For PETG we recommend first trying the surface your 3D printer was designed to use.

• Bed Leveling & Nozzle Height

It is important when printing PETG that your first layer adheres to the printing bed.

• Your bed must be properly leveled.
• Your nozzle height must be set correctly. (distance between the nozzle and bed)

Since PETG will require a heated bed when printing, preheat the heated bed (70 – 80°C) before calibrating your nozzle height or leveling.

The ideal gap between the nozzle and bed is typically a distance of 0.1mm, this is the thickness of two pieces of paper. PETG sticks to itself very well and because of this, can stick to the nozzle during printing. To prevent this it can be beneficial to print with a slightly larger nozzle gap than you usually would for 3D Printing Mumbai.

When changing between bed surfaces, it is important to adjust the nozzle height again to compensate for the added thickness of the bed surface.

• Pre-Heating

For optimal results of 3D Printing Mumbai, it is recommended that you preheat the build plate to 80°C at least 10 minutes before 3D printing PETG. Preheating will help to ensure the bed is evenly heated and increase the ambient temperature to minimize risk of warping.

• Enclosure

An enclosure is not strictly required when printing PETG, however it does offer benefits. The enclosure protects the print from drafts and external temperature changes, important when printing large parts and improves the environmental temperature during printing which can impact mechanical performance and dimensional stability of 3d Printing services Mumbai.

Many enclosed printers have top lids / doors which can be opened or removed. Opening the top lid may be beneficial when printing PETG on some 3D printers.

• Filament Storage

When not in use PETG should be stored away from sunlight and in a resealable bag with desiccant.

Like many other plastics, PETG is a hygroscopic material, absorbing moisture from its surrounding environment. When the filament passes through the hot end the moisture rapidly expands creating bubbles in between layers, poor layer adhesion, inconsistent extrusion due to material expansion and thus poor surface quality while 3D Printing Chennai.

PETG will typically absorb moisture over a period of months; however in environments with high humidity (evaporative air-conditioning) this process can take days while 3D Printing in Chennai.

• Preventing Moisture Absorption

It is important to store and print your PETG materials in their optimum environment (below 20% humidity) to prevent moisture absorption, as excessive drying will degrade the filament. We recommend storing filaments in a resealable bag with desiccant when not in use and we recommend using a filament dry box like the PolyBox™ when printing. PolyBox™ is a spool holder / dry box which stores filament in an environment below 20% relative humidity while offering 3D Printing services in Chennai, preventing moisture absorption.

Watch: https://www.youtube.com/watch?v=WjxMA4CkUZc

PRINTER SETTINGS

• Nozzle Temperature

PETG has a moderate printing temperature, typically printing between 230°C – 250°C.

Of course the printing temperature range of PETG filaments will vary depending on which printer and filament brand you use for 3D Printing services.

PETG is more susceptible to oozing and sticking to the nozzle; these characteristics can be reduced with the correct nozzle temperature. Higher extrusion temperatures will typically result in better flow and layer adhesion, ideal for printing mechanical parts whereas lower extrusion temperatures allow the plastic to cool and solidify faster, beneficial for users interested in overhang surface quality and easier to support removal foronline 3D Printing services.

When starting we recommend trying a temperature right in the middle of the manufacturer’s suggested settings. If the manufacturer recommends 230°C – 240°C, printing at 235°C is a good starting point. If your extruder can not reach the highest recommended temperature, try printing at the lower temperature. Based on the quality of the print we suggest adjusting ± 5°C at a time at your 3D Printing companies.

 

• Troubleshooting Nozzle Temperature

If the nozzle temperature is too hot, you may experience nozzle jams, wisps / stringing on the surface of the print, material sticking to the nozzle, difficult to remove and fused support material, sagging or poor surface quality on overhangs while 3D Printing online.

If the nozzle temperature isn’t hot enough, you may experience compromised mechanical properties due to the poor layer adhesion, under-extrusion (uneven / rough surface quality) and if the filament is not melting fast enough, nozzle blockages.

• Bed Temperature

Printing PETG requires a heated bed at 70°C – 80°C.

We generally don’t recommend heating your heated bed above the glass transition temperature of PETG (80°C ). 

• Heated Chamber

A heated chamber is not required to successfully print parts in PETG. Unless advised by the printer or filament manufacturer we don’t recommend printing with chamber heating turned on.

• Cooling

When printing PETG you can print with the part cooling fan ON or OFF. The best results will vary depending on your printer.

If you are interested in maximizing layer adhesion and strength, we recommend printing with the cooling fan OFF.

Printing with the cooling fan ON will improve surface quality and reduce stringing.

If you can control the power of your cooling fan, even setting the fan speed to 20% can help to improve the quality of overhangs and reduce sagging.

• Rafts / Brims

A raft or brim is generally not required when printing PETG materials; however, it is ideal to improve adhesion when printing with some printing surfaces.

A brim is a thin layer of material surrounding the print that can be added to help improve bed adhesion. The brim can be removed once the print has completed.

A raft is a foundation for the model to print on top of. They can be added to help improve bed adhesion and stabilize supports. The raft can be removed once the print has been completed.

With some leveling systems manufacturers may specifically recommend a raft to compensate.

• Supports

When printing PETG, supports can either be printed in PETG or with a second dedicated support material. Printing with a secondary material will require a printer capable of multi-material / dual extrusion printing.

PETG Supports – With single extrusion 3D printers the model and supports are printed with the same material. When printing both the supports and the model in PETG, supports should ideally peel away by hand.

As PETG likes to stick to itself more than other materials, printing with a larger z axis gap between your model and supports can help improve support removal.

Soluble Supports – PETG can be printed with a secondary support material that has been engineered to dissolve in a solvent. Soluble support materials enable users to print complex geometry with a superior surface finish on undersides. PolyDissolve™ S1 is a water-soluble support material that will generally bond to PETG depending on the geometry.

When using soluble supports we recommend having no gap (z distance) between the model and supports.

Support Troubleshooting – If supports are fused to the model, try decreasing the printing temperature by -5°C adjustments or increasing the distance between the model and supports.

If your supports are failing / collapsing during the print, try increasing support density and printing with a raft, this will improve adhesion for the supports.

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