What bed temp, sheet for printing PLA with PETG supports
I'm going to attempt my first print of multi-color PLA using PETG supports. The object is cantilevered (overhang) with one end having a solid contact area and then slopes upward across the XL print bed. That will be supported with PETG.
What sheet would you recommend (my preference is smooth for this project but can go with satin in recommended)?
What bed temp should I use? (60, 85 or something in-between)?
Should an adhesive or release agent be used? What? For which material?
I've already researched a lot of this and have setup the project with Infill before perimeters, and using PETG for the wipe tower exterior.
TIA
RE: What bed temp, sheet for printing PLA with PETG supports
I've had successes and failures using PETG supports on a 60c satin bed. Adhesion is definitely lower so I had to do some reinforcing from default (lowered angles, double thicc, larger branches), but it works. Grid and snug don't have to deal with leverage so I imagine if you're using those that you won't have any issues once the first few layers go down.
Smooth sheet would give you the strongest PETG adhesion which might counteract the negative effect of 60c bed temps for PETG. I don't even have an XL smooth so can't say if you'd need a release agent or not.
I've read others' posts about meeting temps in the middle and it working fine. But I've had bad experiences with hot beds and curling PLA models, so I'm personally hesitant.
I'd also advise triple checking all of your bridging areas (which may or may not show up graphically as bridging) after slicing to make sure infill isn't trying to anchor to a perimeter that has yet to be extruded.
XL-5T, MK3S MMU3 || GUIDE: How to print with multiple-nozzlesizes do read updated replies || PrusaSlicer Fork with multi-nozzlesize freedom || How Feasible is Printing PETG for PLA supports on XL very
RE:
I have the structured and the satin sheet.
When using the structured sheet with PLA at 60°C it lags adhesion of both the PLA (due to structured sheet) and PETG (due to low temp).
I had some failed prints (PLA released) using the structured sheet.
It works fine when using the satin with PLA at 60°C. PLA sticks as it should and the PETG also holds on better due to the satin surface.
Using the satin sheet didn't fail till now.
If you use a wipe tower make sure to set the PETG extruder in "Print Settings" => "Multible Extruders" => "Wipe Tower Extruder"