Hi,
Thanks! I should have noticed the significance of the box being yellow... I also was not aware of the layer view.
Anyway the parts I printed so far were acceptably strong for the purpose, with the correct shell thickness it can only get better
Best regards,
Simon
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gr5 2,224
Shell thicknes should ALWAYS be a multiple of nozzle - at least until you know exactly how cura works. So setting the wall thickness to 1.5 is basically the problem. There is a complicated set of instructions but in this exact case you end up with 0.5mm traces - which means 3 outer shell passes (except only 2 in your thin section). And they are spaced .5mm apart and the printer overextrudes (or tries to) by 25% to get .5mm of plastic through a .4mm nozzle (not easy to do unless you print slow and hot!).
Now if you did this nice and hot and slow it would come out fine but if you are printing at 50mm/sec, .15mm layers and anything cooler than 240C then you will likely get underextrusion - it's just hard to force that massive amount of plastic through that tiny nozzle.
So what is happening is you are underextruding and getting about .4mm wide traces (spaced .5mm apart) which means your shells aren't touching.
If you simply change the "shell width" to 1.2 (or 1.6) things should be much better off.
Also another tip - make sure you look at the part in layer view (and wait for it to completely load - there is progress at bottom sometimes hidden behind other stuff) so you can see what's going to happen at your thin walls.
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