I'm getting a 25-50% success rate printing anything PETG. It just jams mid print.

3D Printing
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1

I’m getting a 25-50% success rate printing anything PETG. It just jams mid print.

Extruder Temp: 245
Bed Temp: 85
Nozzle Diameter: .40
Extrusion Multiplier .90
Extrusion Width: .40 mm
Retraction Distance: .20
Retraction Speed: 30 m/s

2

What kind of extruder are you using?

3

And what brand of PETG? Some brands require surprisingly high heat.

Does it jam if you don’t use retraction?

4

E3D V6 Extruder

5

I guess I never really thought I would need to print at a lot higher temperature. I’m trying 280c and the print is very shiny like I would expect it to be. Much more than before at 245c. So I guess I will have to wait and see how it turns out. The E3D isn’t a clone.

6

I did print a role of petg with no problem using pla setings but temperatures for petg and above you’re value( i painted for beter look and smoothness)missing/deleted image from Google+

7

It was printing good and then just decided to go crazy.

WARNING Firmware unresponsive. Attempting to force continue…

This is a first and I’m pretty sure I printing from the SD card in my X5 Mini WIFI.

So now it’s just stopped and not printing. ARGH!!!

8

I print PETG without a single issue at 220C. Did you turn fan speed down? PETG cools down more rapidly than PLA and if it’s jamming, it’s probably because the fan is on too high.

9

The only fan I have on is for cooling the hotend metal part before it goes into the hotend. Are you saying I don’t need to run the fan on the coldend part of the E3D v6?

10

No part cooling fan unless you are bridging. Try around 260, and make your retraction speed about 60

11

Careful if you have a PTFE tube in side your hot end. PTFE begins to degrade at about 230, much above there and it will melt and clog.

12

@Testof_Newtablet 246C is the ptfe degradation point.

13

The point on the V6 hot end where the pfte rests should NEVER get that hot or you are melting the plastic well before that point. The heat break and fan should keep the fins cool to the touch

14

I think I have it dialed in now. This is PLA.
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15

PETG
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16

I’m not sure why I have trouble with this smaller portion of the print.

This is my second print that fails when it tries to print that small area.
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17

That looks like classic over retraction. Make sure your retraction is less than 3mm

18

I’ve gotta agree here. Thermal properties of PETG are different than that of PLA and you might be causing molten filament to ride up too high in the heated area of the print head, and cool down enough to jam. With it stuck high enough, it’ll be too difficult for the extruder motor to push and restart.

19

I was using .60 retraction, which is most likely my issue. Maybe I need to try lowering the temp instead of adjusting the retraction.

20

.60 … cm, mm, m ? Retraction jamming shows up more with shorter layer print times…