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GregValiant 1,342
By non-compatible I meant "won't stick". PVA with PLA, PETG with PLA, that sort of thing. If you have the same material in both extruders you are back to the single-extruder problem of the support bonding to the print.
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GregValiant 1,342
When you use a single extruder printer then there must be an air gap between the top of the support and the actual print. If there wasn't then the support would become part of the print and be near impossible to remove.
Adaptive Layers aside, Cura works with a fixed Layer Height and so the minimum air gap is 1 layer thickness. You can play with the other settings but you are going to end up pretty much with what you see in your photos (which really isn't too bad). If your layer height is .20mm and you have a .20mm air gap then you have extrusions calculated for a .20 height that are going into a .40mm gap. They are not going to squish like they would with full support. This is a primary reason people go to dual extrusion printers. Extruder 2 would be for support with a non-compatible material. That means no air gap and the support interface can be 100% density.
One alternative is to print separate pieces and bond them together. I use short pieces of filament for locating pins and have matching 2.0mm holes in the mating parts. Location is very accurate and Cyano-Acrylic glue works very well on both PLA and PETG.
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jwilliams2 1
Hi GregValiant,
Thanks you for the information, this is very helpful.
I have a Ultimaker S5 so it is dual extrusion. I am not exactly sure what you mean by a non-compatible support material. Are you suggesting to use a dissolvable support material that allows me to set the air gap to 0mm? Or two materials that allow for 0mm gap but don't bond well?
Thank you.
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