PET PETG parameters - top solid infill/bridging problem

Hi,

I have been trying various filaments for a project to print molds for ceramics. I am currently experimenting with eSUN PETG and I am really pleased with how it bonds together and the overall print quality.

I started building a profile in MatterControl based on the parameters from eSUN's website, but one problem I cannot seem to solve is getting a nice top surface on a solid object. Everything I do results in small holes in the surface.

I have tried changing the bridge speed, set the fan speed to 100%, and also reduced the 'Top Solid Infill' parameter.

So far nothing seems to do the trick - anyone have experience with this? I never had this problem with PLA/ABS/ABS+

I am attaching an image of the calibration test box from the Robo library.

Thanks,
Jes

 

Try printing more top layers. I do 3-4 top layers.

Although it looks like your having extrusion problems with it anyway based on the raft under it. ( It looks like its underextruding )

What temperature are you using? I use about 240 for ESUN Petg.

 

I cranked up the top layers to 6 and it got better, will try to add another layer tonight and see if it works better. I think the profile is set to have a layer thickness of 0.2, but I am not 100% sure of that as I am at work right now.

If it was underextruding, wouldn't the object itself have issues? The rafts I get are pretty consistent fwiw.

 

I had to take it beyond that to 2mm (10 layers) before it started turning out nice. Was a lot more than I needed for ABS+ but looks like we're there.

Still trying to figure out how to get it to print PETG without a raft, gluestick is not enough, and how to get the printed object off the raft without cutting my hand off in the process - currently have the raft to object distance set to .7mm.

Thanks again though, I think this did it!