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I'm trying to build an assembly with one larger part (about 50 mm x 50 mm), two small parts (about 10 mm x 5 mm) each, and one part that starts with two 2 mm x 2 mm squares that eventually bridge into a sort of flap. The larger part has decent adhesion for a couple of layers, but the small parts are slipping off the table right away and the nozzle drags them onto the large part since it's the last part being printed in the group, resulting in some stringing.

My bed is adequately leveled and can print larger models well so my suspicion is that the small parts are too small for good bed adhesion and need a brim or a raft to increase the surface area. Is this correct? If so, is there a way in Cura to add a brim or raft to the small parts and not the large part? Ideally I would print all pieces at once instead of the large part separate since I will be doing batches of these assemblies in the future.

I'm using Ultimaker Cura 3.6, printing with PLA filament set to 200 °C at nozzle and 60 °C on the bed.

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No, there are no options available to set the brim to some of the parts in Ultimaker Cura.

The image below shows the Ultimaker Cura interface for "per model" settings, basically different settings with respect to the other models. As can be seen, you cannot expand the Build Plate Adhesion (it already shows the arrow downwards, so expanded):

Ultimaker Cura with per model settings

You could however change the smaller model to include the brim in your design, or add so-called "Mouse Ears".

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  • $\begingroup$ By "change the smaller model to include the brim" you mean that I'd open the model in some kind of modelling software (Fusion360, Blendr, etc)? $\endgroup$ – Lux Claridge Jan 7 '19 at 19:30
  • $\begingroup$ @LuxClaridge Yes exactly, there are already a few questions on that topic here. $\endgroup$ – 0scar Jan 7 '19 at 19:40
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In the newest version of Cura (4.5.0), in the per model settings, the only thing you can change for options set Build Plate Adhesion is Brim Distance. What this allows you to do however is create a brim for everything with the distance of a millimeter or two, and then for the part that needs the brim, you just set the distance to zero in the individual part settings. It's a little janky, but you essentially create a skirt for the parts that don't need a brim.

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  • $\begingroup$ Good answer! Would be great if you added an image! :-) Welcome to 3DPrinting.SE! $\endgroup$ – 0scar Apr 1 at 10:16
  • $\begingroup$ The problem still persists if you need - for instance - to add a brim to small parts that are... support structures. While the normal model has got a sufficient adhesion part that does not need any brim. $\endgroup$ – Jlm70 Oct 13 at 22:40

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