Printing without material - is it safe?

[swinkaszynka 0]

Hi there,

I'm learning 3D print with my U3+ and today, while I was printing 8-9h part, PVA support material ended (2nd core). Is it safe to continue printing without material in core/nozzle? I've reduced temperature by 25 degrees (I can't reduce it more), and changed the flow to the minimum value. I don't want to stop print because support is no longer needed (even if Cura created program with the support to the very end). What do you think about heating up core without material inside?

[gr5 2,268]

You should be fine. The 25 degree cooler thing is most important. The worst that can happen is that you bake the pva too much and you clog the nozzle. Nozzles can be repaired but it violates warranty of the core itself because they have a delicate part but I created a video (I'm not an Ultimaker employee) to help you do that should you clog your BB core:

on youtube search for: ultimaker 3 core disassembly

by gr575