MakerGear Forum

So, I've been working more and more with PETG. I like it a lot, but I've discovered that my layer adhesion isn't that great.

I can tear my parts apart, strand by strand, layer by layer. I have a V3B hot end and I'm printing at 250° (Afraid to go higher) 40mm/sec

Any ideas?

You will have to provide more details on your print settings for any chance of useful help. Zip up your profile and upload it.

Yeah something isnt right there. Of all the plastics petg layer bonds like crazy. Are you using petg or pet+? Opaque pet+ will do what you describe.

Had this problem until I started running with the fan off through the entire print. Additionally you really need to make sure you have your extrusion multiplier set correctly.

Here's my zipped factory file. Sorry it's taken me so long, I've been out of town.

Using PetG blue. No cooling fan. Extrusion Multiplier at 90. Maybe the adjust print speeds for layers <15sec? It's a small part.

If you guys see anything, please let me know!

Thanks.

Just a few quick notes, not anything that will definitively solve your problem, but things I noticed:

You have M108 S155 in your start up gcode. On a recent vintage M2, that will turn OFF your extruder fan or cause it to run at approximately half speed. Remove that line, or change it to S255.

Your infill extrusion width should be set to 150 or 200 for PETG.

Is .90 extrusion multiplier accurate? Run an extruder multiplier calibration, there's a thread in the tips forum. I find 1.0 is closer for me, and I see numbers of > 1.0 in other people's calibrated profiles. Also measure and input your correct filament diameter if it's not exactly 1.75mm.

Ed just today has posted details of his PETG profile, you may want to try to glean some wisdom from it: http://softsolder.com/2015/03/20/makerg ... -for-petg/ He is using Slic3r, but many of his recommendations will carry over. Note that he does a 3 layer combined infill, which has the effect of a 300% infill width, albeit printed 3 layers apart.