House brand PETG issue?

What does this tell us? EDIT: after looking at some of the makes it looks like i need to recalibrate my e-steps as a start, i did it once but have since flashed new firmware so i think it needs to be done again

I had to enable print thin walls for it to slice

I did the TeachingTech version it turned out as expected even after a poor first layer

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On my printer, a new firmware update brought a new tuning menu option for setting e-steps so it’s dead easy. basically measure, mark, press the button, measure again, and enter the new value. I printed with 3 filaments today, one PLA one PTEG, and one PTEG with carbon fiber. all f it was 3dPc material and each one needed a different e-steps value. I thought it was set once in a while but it appears there’s an advantage to set it for every kind of filament.

I had done temp towers before and settled on 235° for the PETG filament. your test cubes look better than the first prints you showed this morning.

Edit: And I just realized I started another PLA print and forgot to change the E-Steps …

it’s breaking both directions.

Fresh temp tower 250-210


I can’t break these pla towers this easy…

Only the pink is PETG is the above photo

Clear is Eryone
White is Polymaker
Black is Polymaker, Eryone or Overture
Green is mg chemicals
Pink is the one shown a few posts up

I’ve used this much of each roll trying to make it work… :frowning_face:

I want to think its me or the machines but :man_shrugging: i hope this big first order wasn’t a mistake…

Order summary

\ 60x60 Red - 1.75mm PETG Filament - 1 kg × 1 $19.95
\ 60x60 Blue - 1.75mm PETG Filament - 1 kg × 1 $19.95
\ 60x60 Natural Brown - 1.75mm Wood PLA Filament - 1 kg × 1 $25.95
\ 60x60 Black - 1.75mm TPU Filament - 1 kg × 1 $25.95
\ 60x60 Dark Green - 1.75mm PETG Filament - 1 kg × 1 $19.95
\ 60x60 Carbon Fibre - 1.75mm PETG Filament - 1 kg × 1 $29.95
\ 60x60 Silver - 1.75mm PETG Filament - 1 kg × 1 $19.95
\ 60x60 Black - 1.75mm Standard PLA Filament - 1 kg × 1 $20.95
\ 60x60 Transparent Blue - 1.75mm PETG Filament - 1 kg × 1 $19.95
\ 60x60 Black - 1.75mm PETG Filament - 1 kg × 1 $19.95

Even tho these failed ( on 3 attempts with a clean level bed ), running with no fan just smart bridging the edges are unacceptable. I just want aesthetically pleasing stronger than PLA parts, is that to much to ask?

Here are transparent red and white PETG test cubes ive printed recently. The red and black carbon fibre i have (cubes in the shop) has absolutely got to be dried before I print it. The white I dont think I’ve ever dried and didn’t have trouble but that red is a problem unless it spends time in the dryer first. The shelter thing I’ve printed 5 or 6 of them coarse and fast and they come out ok (we have lots of eggs from our chickens) still need 6 more and have no time heh.

oh and those cubes are solid. The red is very friable if I don’t dry it and the carbon fibre I posted the video of jams up the nozzle.

i don’t fell i should have to dry something i just took out of the package, i can see if it was sitting exposed for long periods of time. petg isnt PC that can go bad by the end of the roll while printing ( or so ive seen in videos )

But if you want to get to the bottom of why its not working then… well then you can blame the supplier for it being wet but at least you’ll know and won’t waste any more time fiddling.

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House brand Petg guy here. I’m finding a dryer/dehydrator/oven isn’t strictly necessary.
I haven’t had a lamination issue since I bought a pound of silica gel and threw it in a dog food box. Hygrometer says it bottoms out between 16 and 20% humidity.
For the record: Biqu Bi, 225/80, .No fan. 6mm tip, .3mm layers with slight, slow retraction and lots of coasting (like 1mm cubed)
When I’m feeling geeky, I’ll throw a roll in the oven or dehydrator for an hour, but the factor that changes the look of things most seems to be ambient temperature. I can see when I’ve opened a nearby door to let the cats out, for example.
Next experiment will be an enclosure.

I don’t have a dry box and my wife already asked me why I was seeing how low the oven goes ( her reaction was less than enthusiastic when I told her, so that’s likely off the table)… but I’ve ordered some reptile heating mats from Amazon to build one diy in the future.

I guess I can open another spool for each machine and roll the dice on it being better, but that doesn’t help my orders for specific colours…

Lol.
Remind the Missus that petg is food safe (most of the plastic in your fridge is made of it) and approved for indoor air quality when melting for printing.

she’s having flashbacks from the headlight I baked once hah

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the thin wall boxes and cubes do look like under extrustion. Because they are brittle I am tending to lean that way.

What were the results of the extrusion calibration ? if the e-steps are ok there I’m almost thinking the nozzle may be partially clogged?

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esteps went from 415 to 433.31 the teaching tech cube was after re calibration

i have some hardened nozzles i bought but haven’t put in i can swap

what are the chances both machines are clogged tho… the red is in my MegaZero2.0 and the blue is the MegaPro

that’s a good point, Its rare to have 2 machines clog at the same time but not impossible.

Lets focus on one machine for right now(doesn’t matter which) and lets put a new nozzle in it and compare it to the last print off the same machine.

My Wife hates it when I’m messing with the oven as well, she knows I’m up to no good. I got a cheap toaster oven and use it instead. :slight_smile:

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Other than it not sticking on that corner it Printed as expected on my megazero in the red PETG

Changing the nozel on the megapro next

Nozzle is in, have to run to town so I can level and print yet but when I was priming it I can see what looks like bubbles in the filament as it extrudes. Moisture I’m guessing?