Struggling to print good Y carriages

[jbasol]

Folks, I'm really struggling to print decent Y carriages for my HevORT build. My current printer is a Prusa i3 clone, and so far has printed the rest of the XY parts just fine. These Y carriages are making me pull my hair out though, as the supports seem to 'blend into' the part itself, making removal tedious at best and detrimental to the underling part at worst. I am currently printing with PETG and am using the support settings suggested by Mirage in this thread: viewtopic.php?f=4&t=74

It looks to me like the even though the support Z distance is set to .18mm it is blending directly into the supported part.

Ycar1.jpg

Ycar2.jpg

Ycar3.jpg

As you can see in this last picture, when I try to break the support away, things get a bit messy. Obviously I can sand or take a dremel to it in some areas, but not all of it is reachable. Any suggestions to make this better?

-John

[hydrogen1]

I changed the part orientation. Still a pain but less so.

[jbasol]

Yeah, I've been considering that myself. At least for these 'first run' prints. I know in one of the print instruction threads Mirage mentions the parts are oriented for strength in the STLs, but I think my current setup may not have the required 'finesse' to print in this orientation. Once I have my HevORT up and running I intend to reprint with something stronger and more heat resistant anyway.

[Jhonno]

What layer height are you printing at?

[jbasol]

Layer height is .2mm

[Jhonno]

Have you tried setting support distance to the same? Also add some gap to X/Y?

[jbasol]

I ran another print overnight with the support distance set to .2mm, and XY gap at 1.2mm I also tried enabling the tapered support option, but it just gave me more room on the sides to break chunks of the support away. The roof and floor of the supports are still a fused disaster once the middle is broken away, like the support interface layer is bonding with the part itself too well. I may try a slightly cooler extrusion temp (presently 240C).

[Jhonno]

I ran another print overnight with the support distance set to .2mm, and XY gap at 1.2mm I also tried enabling the tapered support option, but it just gave me more room on the sides to break chunks of the support away. The roof and floor of the supports are still a fused disaster once the middle is broken away, like the support interface layer is bonding with the part itself too well. I may try a slightly cooler extrusion temp (presently 240C).

What is your support extrusion %? I set mine a lot lower than the main extrusion rate..

[jbasol]

So I'm not terribly familiar with the Ultimaker software, so you'll have to forgive my slight ignorance here. I used to use Repetier Host utilizing the built in cura slicer there, but there were far fewer settings available. Based on the description given in Ultimaker, I think it's the Support Flow setting in the material section, it's currently set to 100%. Perhaps I should set that bit lower?

Thanks for thinking through this with me BTW!

[login721]

What slicer are you using? Prusa slicer support is suck. I have switch to Cura to print the Y carrier. Enable "break support into chunks" will help(and also support interface based on how filament act).