Painted overhang supports ruins my print how to improve
I design a model, sliced it in Prusa slicer 2.9.4 and added manual support. Since I had bad experience before adding supports automatic I used the paint tool. So added them sliced and made the print. Which came out like on the picture. Not very nice at the side where the support is added.
I used dried PETG (printing out off the dryer) and selected even very slow printer settings Core One + , 0.20, for my HF Obxidian 0,6 nozzle, 20 infill. I have had several problems before after adding supports to prints, which where most time to be removed only partly and leaving a mess like on this example. So is this something I"m applying wrong? How to improve this (in general and for this object) or could I have printed this without the "recommended" support? I have ignored this recommendation for some prints which still came out very nice.
RE:
Why not use auto-generated organic supports?
I think they would work well for this model.
As for why this print looks bad: You only supported a very small area of the overhanging lip, so a big part of it is still unsupported.
In order to get easy-to-remove supports set "Top contact Z distance" to 0,2mm or, if you want the best possible result with a single-extruder printer, follow this video
This is an occasion when designing tailored supports into the model CAD may be better than relying on automated support algorithms.
Like this:
The red support plane is a bridge just one layer thick, it forms the base of the overhang and rests on thin walls that themselves bridge the lower structure.
Removing the support is the same as removing a brim - here I have drawn it much wider than it needs to be to make the picture clearer.
Cheerio,
RE: Painted overhang supports ruins my print how to improve
Thanks, that seems a good idea. Hope my cad skills are enough to sketch this as an addition. Thinking about this, I wonder how this will work when printing, since the red part is as well an even bigger hangover, right?
the red part is as well an even bigger hangover, right?
It's a bridge - the extrusion is supported at both ends (and there is a bridge angle setting in the slicer which you can use to configure it) so the sag is greatly reduced 'though it won't be perfect.
Cheerio,
RE: Painted overhang supports ruins my print how to improve
Thanks I will have a look at that.
RE: Painted overhang supports ruins my print how to improve
Seems like organic supports would be perfect. Just use the automatic mode and highlight the curve face you want to support. Play with the parameters to get a reasonable number of contact points, say 20-30 across the face. My experience with overhangs like that is they're always terrible if the support points are too far apart.