3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.  

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

Cross-post, but this is how I solved it:

- add 0.05mm to the live Z. 0.1 was too much
- use gluestick to avoid having the PETG stick like crazy to the build plate.
- slow down solid infill/layers speed from 200 to 80 mm/s (maybe faster works, didn't try 20 times)
- when doing big solid layers, either pause the print yourself by triggering a filament change in the menu or add filament color changes every solid bottom layer so you get time to clean the buildup off the nozzle.
- check the extrusion multiplier. Make sure it's not too high

Seems to work fine so far.

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

[...]- add 0.05mm to the live Z. 0.1 was too muchI find an adjustment of 0.07 or so just about perfect to account for the difference between PLA and PETG.
- use gluestick to avoid having the PETG stick like crazy to the build plate.I'm avoiding using gluestick or any other additive. For PETG, window cleaner and/or a bit of the "forehead wipe" technique seems to loosen adhesion up just enough. I'm having luck with PETG (3DXPro, Inland, AIO), NGET and XT filaments.
- slow down solid infill/layers speed from 200 to 80 mm/s (maybe faster works, didn't try 20 times)The big breakthrough for me was realizing it's extruder throughput that causes most of the jams and skips. Rather than creating printer profiles with different speeds for different filaments, I'm adjusting the Filament Settings->Advanced->Max. Volumetric Speed setting, combined with Print Settings->Speed->Max. Volumetric Speed set to 11.5 per E3D for the V6 extruder. I had good luck with 8 mm3/s for 3DXPro, but have tweaked it downwards (e.g. 7.5) for other brands. For filled or flex filaments, I'm finding 1-5 works. The key is that this setting will let the printer run at up to the maximum speeds you specify in Print Settings->Speed but will throttle it if the combination of nozzle size, line width, layer height, acceleration and/or speed exceed these throughput limitations. This way, the printer prints as fast as it can but still respects the limitations of the extruder's ability to heat filament.
- when doing big solid layers, either pause the print yourself by triggering a filament change in the menu or add filament color changes every solid bottom layer so you get time to clean the buildup off the nozzle.I've not had to do this, so perhaps I've just been lucky. I've done a few long, overnight prints using Inland PETG without issue. I'm hoping the max. volumetric settings will keep output within printer spec and avoid these sorts of problems.
- check the extrusion multiplier. Make sure it's not too highDefinitely this! I always seem to forget until I'm watching the 1st layer go down and it seems messy.

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

Max volumetric speed is indeed a good global speed limiter, it's just that the number does not make any sense to me 😀

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

I managed to do my print now, but I am suffering from inconsistent extrusion on the top layer. Any idea?

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

Max volumetric speed is indeed a good global speed limiter, it's just that the number does not make any sense to me 😀
Not sure if you mean the concept, or the values I suggested. That value takes into account nozzle bore, extrusion width, layer height, speed and acceleration (and likely something else I've forgotten) to calculate the total amount of filament being shoved through the hotend measured in mm^3/s. The characteristics of the filament, including any fillers, is also important. Sometimes, the recommended print speeds are real limitations. The stock E3D V6 can handle somewhere in the range of 11-16m^3/s, so you don't want to exceed that. The default for PLA is 15, so conceivably, you could be just above what your particular printer is capable of. With other filaments, the consistency of the material may make it prudent to slow down to ensure filament spends adequate time in the hotend melting properly. By tweaking the setting, you're telling Slic3r to let it print up to the limits you set for speed and acceleration so long as it remains within the throughput limits. Otherwise, it slows things down.

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

Max volumetric speed is indeed a good global speed limiter, it's just that the number does not make any sense to me 😀
Not sure if you mean the concept, or the values I suggested. That value takes into account nozzle bore, extrusion width, layer height, speed and acceleration (and likely something else I've forgotten) to calculate the total amount of filament being shoved through the hotend measured in mm^3/s. The characteristics of the filament, including any fillers, is also important. Sometimes, the recommended print speeds are real limitations. The stock E3D V6 can handle somewhere in the range of 11-16m^3/s, so you don't want to exceed that. The default for PLA is 15, so conceivably, you could be just above what your particular printer is capable of. With other filaments, the consistency of the material may make it prudent to slow down to ensure filament spends adequate time in the hotend melting properly. By tweaking the setting, you're telling Slic3r to let it print up to the limits you set for speed and acceleration so long as it remains within the throughput limits. Otherwise, it slows things down.

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

I managed to do my print now, but I am suffering from inconsistent extrusion on the top layer. Any idea?
Those look like gaps in the filament. If the rest of the print looks good, the easiest thing to try is adding another top layer. You could try increasing the extrusion multiplier, but that may have adverse affects elsewhere.

Re: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

I cranked up the temperature and slightly increased the extrusion multiplier, and got a good print. Here is my filament config file for the 3DXTech LowGloss PETG filament.

Chris Shaker

RE: 3DXPRO LOW-GLOSS PETG. Jams when printing big surfaces.

@christopher-s

Can you repost your config file?  I just bought a spool of this filament and I'm trying to dial things in.  What's your overall thoughts of this filament vs normal PETG or ABS?