All 3D settings are in Thingiverse. They are printed in a Lulzbot Taz 6 with Verbatim Primalloy in an Aeronstruder v1.

Printed with the Ninjaflex Standard setting's profile from Cura LE (Except with Retraction off)

Layer height: 0.3mm 
Wall Lines (Shell): 2
Print Temp: 235C
Retraction: Off
Build Plate Temp: 50C Print
Speed : 20mm/s
Cooling: On
Support: Off
Build Plate : Skirt ( + Elmers Glue)

Print the pattern, and make sure it's 100% scale so you don't print it smaller or bigger.

Take the pattern (already cut) and place it inside de HolderToLamp.

Then place the inside cover on top and press over the edges to make the snap click.

Take the whole cover and place it on the lamp gently, starting with one edge and then going around pressing over the edges.