Can only get Combing to work in Surface mode

[Wingspanner1968 0]

I'm trying to set up a profile to produce a thin wall aircraft with top and bottom layers.

Only thing is i'm using lightweight pla which is giving me issues with stringing.

I have added retraction but have only been able to use combing with surface mode set to surface.

this removes my top and bottom layers.

If i switch surface to normal my top and bottom layers show but combing fails.

[GregValiant 1,359]

Airplane parts (and some boat parts) are different and often require workarounds.  Use the "File | Save Project" command and post the 3mf file here.  Someone will take a look.

 

It looks like you have "Avoid models when traveling" enabled.  That might be causing a conflict/override of the combing setting.

Combing might say "travel on the walls" while "Avoid..." is saying "get off the part".

Edited March 11 by GregValiant

[Wingspanner1968 0]

Cheers I’ll have a look when I get back from work!

[Wingspanner1968 0]

I Have attached the 3mf file. I tried deselecting the Avoid models whilst travelling but it was still the same

Hatch 2.3mf

[GregValiant 1,359]

This slice was with "Spiralize Outer Contour" enabled.  "Travel Moves" is turned on.

 

I recognize the design style and intent.  This model has been designed to print in spiralize mode.  The internal ribs are exactly the correct width to provide an up-and-back movement so the nozzle never has to stop.

Another indicator is that the bottom starts out narrow, then widens but isn't a sharp step, it has a chamfer.  That allows it to print in spiralize (spiralize doesn't do roofs) and will not require support.

 

 

The support for that notch on the bottom is a separate structure.  That means Cura must travel to it and so there can't be true spiralize until the two islands join at about layer 15.  Once it gets above that the nozzle just keeps moving and extruding so travel moves aren't required.

 

EDIT:

I would strongly suggest that you use a skirt or brim rather than a raft.  Rafts generally are harder to remove than a brim, and the print can be damaged during removal.  I do have a handy-dandy post processor that you could use to print the top of the raft with PETG (if you have some laying around) which PLA doesn't stick to very well.  The raft would come right off.  If you would like to try it out I'll post it.

 

Edited March 12 by GregValiant

[Wingspanner1968 0]

ok, thanks for your help much appreciated