Tools:

Drill

Helicoil Installation Tool https://www.amazon.com/ZFE-Helicoil-Thread-Repair-Insertion/dp/B00RFKHHRW

Helicoil Stainless Steel Helical Insert, M2.5 x 0.45 Thread, 2.5 mm Long 91732A764

Instructions:

Print the file using 1mm supports 

Remove supports from the back of the trigger andthrough all the holes. 

Print using the proper settings for your printer and material. Finishing may be accomplished by sanding, Acetone Vapor Bath, or whatever method is required for the material being used.

Use the drill from the helicoil installation kit to drill out all 3 holes in the trigger.

Use the tap from the kit to tap the center hole. 

Install the helicoil per the kit instructions.

Install the trigger on your CS1/160R. Enjoy!