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sjstein

Strange ancillary shape using nylon and slicing with Cura 4.4

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Posted · Strange ancillary shape using nylon and slicing with Cura 4.4

Hello community,

 

  I am a routine user of our Ultimaker S5. Up until now, I have only used PLA and PVA for supports. However today I switched to nylon for strength reasons (all consumables are Ultimaker branded). After changing materials, I ran Cura (v4.4) and it updated the settings within the software. I sliced my model and dutifully sent it to the printer, then went on with my day.

 

After a few hours, I went to check and saw something really odd -  not only was my shape printing (along with PVA supports), but there was a "phantom" shape in the corner. A cylinder of (apparently) the same diameter of my model. 

 

Going back to Cura and viewing the preview, I now see that it (Cura) did indeed make a shape off in the corner. 

 

Is this a feature specifically for nylon? If so, where do I find that defined or documented in Cura? 

 

If this is not supposed to happen, can anyone explain what is going on?

 

I've enclosed images of the cura windows - both the model alone and the preview pane.

 

Cura1.PNG

Cura2.PNG

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Posted · Strange ancillary shape using nylon and slicing with Cura 4.4

That's a "prime tower", it makes sure the nozzle is full of material before starting on the actual print (it can also help wipe residue off the nozzle so that it isn't dragged into the print). Some materials are more "runny" than others and loose a bit of material from the nozzle which means you might get a little bit of underextrusion when swapping between the materials. For PLA they've managed to tweak the temps and timings so that the PLA is printed just barely hot enough to extrude properly but still be basically ooze free when swapping nozzles, that's why it can be printed without the tower.

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Posted · Strange ancillary shape using nylon and slicing with Cura 4.4

I did let the print finish and it was somewhat of a disaster. The travel between the tower and my part was rife with strings which created quite a mess.

 

I've abandoned the use of the PVA support material - which removed the "prime tower". I'm using the nylon itself now as its own support material. It prints much better, but removing that nylon is a chore.

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