Question

fff: design strength strategies
there are four ways you can strengthen a fused filament fabricated piece: infill, scat, re - structuring, and origami.
infill
a 100% infill piece will be strong and rigid. however, it might tend to crack and separate. 60% infill is best for a fused filament fabrication (fff) piece.
scat
with this strategy, a user breaks apart their model and prints it in three pieces. the pieces are then bolted together. this is an opportunity to use holes and mechanical fasteners. this technique overcomes weakness in the z - axis.
re - structuring
this strategy is similar to the scat technique in that the print is sliced into three sections. each component is oriented in a different direction or plane. the goal is to have a strong plane against a weaker plane. depending on the geometry of the piece, this could reduce the amount of support structure, optimize bridging, or optimize surface area. the face that is closest to the print bed will be the smoothest.
origami
this technique is used if a user is printing an object such as a cube by unfolding it and printing it flat. however, each edge, there is a layer of skin. after removing it from the print bed, it can be folded, hence the term origami. there is a built - in place - against - plane structure, which is light. this is a good technique when there is a thin wall and simple geometry.
a 100% infill piece will be which of the following?
smooth and transparent
hollow and brittle
porous and flexible
strong and rigid

Explanation:

The text explicitly states under the "Infill" section that a 200% infill piece will be strong and rigid, though it might crack and separate. This directly matches one of the options.

Answer:

strong and rigid