Summary

After playing with the 1st design, I found a way to cut out more plastic & make it stay connected on the motor mounts better. There are 3 options for printing this, Full Frame, Corners Only or Half Frame.

I use eSun PETG filament since it has a little more flex than PLA. You should be able to install any of these 3 types on your quad from the bottom without taking the propellers off.

Here are the weights I measured:

Quad Weight without Guards: .53oz (15.02g)
Full Frame: .067oz (1.87g) & 00:27:26 print time at 20% infill Yellow PETG
Corners Only.053oz (1.5g) & 00:26:37 print time at 20% infill Yellow PETG
Half Frame: .059oz (1.67g) & 00:27:09 print time at 20% infill Yellow PETG

You can print this without supports & minimum infill. I used 20% infill & layer height of .2mm