Help with layers

[hijackgmh 0]

I'm having trouble getting holes to print cleanly.  Is there a way to print several layers at 100% infill (so I can drill the holes later) and have subsequent layers printed at a less than 100% infill?

[Slashee_the_Cow 295]

You can use create a support blocker and turn it into a modifier mesh which changes the model's settings. This can also be done for horizontal/vertical spans, not just layers, if that would help.

1. Select your model
2. Click "support blocker" in the sidebar: 
   
3. Click somewhere on your model (anywhere, really, although getting it close to the place you want to change doesn't hurt):
   
4. Select the blocker and use the move and scale (you'll probably want to turn off Uniform Scaling) tools (the top two on the sidebar) to make the blocker the correct size and move it into position:
   
   
   It doesn't matter if it's too big, unless there are nearby models you don't want to be affected.
5. Click "Per Model Settings" in the sidebar and set the mode to Modify Settings for Overlaps
   
6. There'll be a bunch of settings already there. You can just leave them at default.
7. At the bottom, click Select Settings, go down to Infill Density, select it and click Close:
   
8. Set your shiny new infill density setting to 100%
   
9. Go to the preview, sit back and behold your solid support (I removed the shell from the layer view so you could see the support for this screenshot):
   

[hijackgmh 0]

Thanks!!