Invisibility Shield Lenticular Lens (PLA)

Inspired by patthemovies, and a burning desire to make things disappear, this invisibility shield is printed on a K1C in clear PLA. Following the same basic design, I created a single line width sheet in Tinkercad (150x100) and gave it a triangular base. It started out fine, but the unsupported edges of the "screen" got ragged where the print head started, and at about 35mm up it was just too flimsy to stand still to get the next line, and always spaghetti'ed. I duplicated the triangular base to be an all around frame, but the screen was only connecting to the right side frame when printing. Watching the print, I realized that it was printing the ride side triangle, then printing the single line screen left to right, then going to the left side and printing that triangle. Mucking with "Walls printing order" in Orca, it prints both triangles first when set to "Inner/Outer/Inner", then the screen between the two, and voila, the screen is connected on both sides. Seam position also messed with the screen connecting to the frame, as Orca was putting the seam right at the point of where the triangle frame and the screen connected. Move that to "Back" and the seam is no longer at this critical point. I was also getting some odd waves in the face of the screen, and came to realize it was a propagated anomaly from the grid infill in the base triangle. Since the triangles don't really need infill on any of the 4 sides, setting infil to zero resolved the waves on the screen. Wall Generator is set to Arachne, as Classic ignores the screen when sliced because it's too thin. Hopefully my tinkering is helpful!

If you want to make changes, this is literally a flat surface .4 thick, add a tent shape all around. I considered making the frame bigger to make it sturdier, but smaller prints faster and uses less material - I made several so kids could take them to school and leave them with teachers. Print at least two so you can experiment with stacking them! It's worth noting that, unlike Pat's model, which has a screen that is 1.52mm thick, I decided to try a single thickness in an attempt to block light as little as possible. This probably makes printing a little more challenging if your printer isn't dialed, although my K1C is pretty bone stock, nothing fancy, and it prints the screen nearly perfect. Because there is a rigid frame around the screen, it shrinks differently than the screen when it cools and the screen bulges a little and won't be completely flat, but has no impact on it's operation, so non-issue for me.

Layer height: .25mm
Line width: (stl is .4 thick, Orca is set to .42)
Seam position: Back
Wall generator: Arachne
Walls printing order: Inner/Outer/Inner
Infill: 0%