Framing an area of the print object that you want solid, no infil.  

RE: Framing an area of the print object that you want solid, no infil.

Try adding a modifier for the area you wish to be stronger, and instead of specifying 100% infill, specify lots of top layers and bottom layers. 

the reason for this is, that 100% infill often causes extrusion issues, where as top and bottom layers are less likely to do so... 

If I ever want a solid model, I use top and bottom layers

As you might have noticed 100% infill is barred in most infill patterns, simply because it is so problematic

regards  Joan
p.s. I say that top and bottom layers are less likely to cause problems...  because, IF you are having extrusion issues (Leading to filament pickup on the nozzle) which I believe you reported in a different thread,  you may be suffering from over extrusion (Or warped print) 
PETG tends to stick to the nozzle when the nozzle is ploughing through existing filament and after a while the filament forms a big enough blob to fall off / wipe off the nozzle, causing issues and possibly layer shifts or models being knocked off the build plate... (this is particularly common with 100%infill, or solid sections of models... )
reducing the flow rate, if you notice a nozzle ploughing through the previous layer, or reducing the extrusion multiplier a little during slicing can reduce the chances  of this happening. 

RE: Framing an area of the print object that you want solid, no infil.

I added a modifier and it worked perfectly. I am still getting familiar with the tools available to me. 

Thank you. 

RE: Framing an area of the print object that you want solid, no infil.

You can learn something new, every day!
Lol

regards Joan