PETG Pulsar 3mm settings

[Rens Timm]

Hi,

Iam working on a Cobot (TM12) Pellet extruder (Pulsar) combination. Its almost up and running but Iam trying to find/calculate the correct settings for Virgin PETG. Does anyone has reliable settings for it?


Nozzle Diameter
3mm
Layer Height
1.5mm (50% of the nozzle diameter)
Can be adjusted between 0.75mm and 2.4mm
Extrusion Width
3.3mm
Approximately 110-120% of the nozzle diameter
Volumetric Flow
296 mm³/s
50% of the maximum flow rate of 592 mm³/s
Stepper Motor RPM
314 RPM
Calculated based on the required flow
Print Speed
60 mm/s
Movement speed of the print head to achieve flow
Temperatures

190

235
260
Flow-to-RPM Ratio
0.7
Specific for Fortis 3D PETG (as from the table)
Max Flow (for 3mm)
296 mm³/s (based on interpolation)

[Technical Support]

Hello Rens,

If you haven't already, for virgin PETG we recommend using the minimal compression ratio (1.5) screw instead of the standard screw (2.6) as you may run into stability issues with the standard.

Extrusion still works with the standard screw and PETG but in longer prints it is not as stable and you may get partial to total jams over time.

Those settings seem all good for a 3mm nozzle. You may have to raise the top and middle heaters temps but I always recommend going with the lowest temps first and then raise them slowly by increments if you get under extrusion.

PETG can be quite tricky and results can vary a lot depending on each specific brand and additives added, temps profiles listed in the doc may need a lot of tweaking for your own material.

What you have to watch out for:

- anormal noises when the pellets go down the barrel, random under extrusion, unstable flow may indicate that you need to switch the screw to another compression ratio
- under extrusion due to partial jam that transforms into total jam, motor skipping due to the jam, access the screw to check if pellets have melted and agglomerated together too close to the feeding section, forming a clog. If so, lower the top heater temperature.

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[Rens Timm]

Thank you, Flo,

Could you send me a link to the 1.5 comp ratio screw? I need help finding it on your website. And is this described in the manual? I've read it a couple of times but haven't seen anything about a 1.5 comp ratio screw for PETG.

Thanks for the fast response.

Op dinsdag 15 oktober 2024 om 16:34:07 UTC+2 schreef Technical Support:

[Alex LaVelle]

I’m in a similar position with PETG but more of a supply chain question. If virgin PETG needs a different screw to work, and rPETG comes in a non-ideal format (chopped cylindrical pellets), where is the recommended source of pellets? Or is the standard advice to swap screws and run virgin PETG with spherical pellets?

Regards,

Alex C. La Velle

To view this discussion on the web visit https://groups.google.com/a/dyzedesign.com/d/msgid/support-dyze-design/CALejnW3z6ESswPD7gfHcooB8ucqp_MzK-Pd0UMB1U7TkFTkRXA%40mail.gmail.com.

[Technical Support]

@Rens

The different screws are not available on our website, you would have to contact the sales department at sa...@dyzedesign.com. I forwarded this to my colleague in the sales department and they should contact you soon.

It is a recent product update after feedback from our customers, information has been added only very recently in the documentation, that is probably why you haven't seen it yet. https://docs.dyzedesign.com/pulsar.html#screw-type

@Alex LaVelle 

For both virgin PETG and rPETG you can use the minimal compression screw. For rPETG you can generally also use the standard.

It's just that virgin PETG tends to be unstable with the standard compression screw but rPETG doesn't have this issue as the material has been broken down already and is easier to work with.

While cylindrical pellets are not the most ideal format like the spherical ones you can still use them entirely successfully, so go with what is the easiest to source for you.

For example we successfully used rPETG from Reflow which are cylindrical pellets in several prints before.