Ultimaker 2+ smearing small features

[Daniel_L 0]

Our Ultimaker 2+ has recently been smearing small protrusions and bosses. So far this has typically been at the topmost portions of a print, where the cross sectional layer becomes very small. It looks almost like the print head suddenly gets in a major hurry and starts rushing at these small parts, or at that point it also looks like it might not be raising properly by the correct z height. It starts to smear through what it's already printed, and just makes a mess. Any idea what could be causing this?

[SandervG 1,156]

Hi Daniel, welcome to our community! 

You may want to increase the minimum layer time setting. It will force the printer to slow down on those layers which should give the filament time to cool down. Without it, it does not have sufficient time to cool down after extrusion, plus the hot nozzle that it touches keeps continuously heating/melting the filament. 

[Daniel_L 0]

Ah, that sounds like a good setting to try. Thanks, SandervG!