bottom thickness 0 only for first layers

[edwardlego 0]

i'm printing something that's very wide at the bottom and the surface it sits on doesnt need to be closed, to save time and material. a simple solution would be to set bottom thickness to zero, but there are some overhangs a bit higher up, and those get their bottom removed also with this setting. cutting the model in parts, stacking them in cura and changing the settings for each part doesn't help because the bottom/top gets printed at the seams, increasing the time again

 

i basicly need a setting to change the bottom touching the buildplate to be 0, not the bottoms on overhangs

[ultiarjan 1,223]

can't you just drop the model a bit below the build plate?  without a picture it's hard to imagine your model...

 

[AbeFM 35]

If you drop the model,  you'll just get a floor printed below the model.

[edwardlego 0]

the bottom is open with bottom set to 0, but also the overhang, which is what i'm trying to avoid

[AbeFM 35]

If it's a one time thing, you could edit the g-code - you could cut out the bits you don't want.

 

Set basically delete the lines after the set up and the skirt, going to layer 3 or 4 (or whatever the first no-bottom layer is, (number of floors + 1), then just set the current Z to that height, and you should be able to retain the rest of the code.

 

It's probably a good exercise, and doesn't require massive new skillsets.

[edwardlego 0]

i'll try your method, but this should be an option in cura, i've printed a lot of bottomless things, only now the open overhangs have been an issue