The KM9 Unicorn blaster is a great little compact springer platform good for 130-230fps games. Unfortunately when you install the metal internals upgrade kit, sometimes the mechanism that is supposed to enable slamfire doesn't work right, preventing the sear from moving when the trigger is pulled. This 3d printed part, inspired by Aldoss' video on YouTube addressing this issue, is designed to replace the slamfire component in the trigger group with a spacer enabling the trigger to move the sear under all circumstances.

Print settings: 

I recommend printing with full infill or so many walls that it creates full infill (like 18 or so), I have no idea exactly how much stress this is under. It's so tiny you won't save a noticeable amount of filament trying to make it thinner so why bother, just make it solid.

Prerequisites for installation:
1) remove slamfire part

2) remove safety

3) install printed part with tiny nub facing down and towards the front of the blaster so it interfaces with the top of the trigger

4) reassemble blaster and enjoy

See Aldoss' youtube video below for why this part is necessary and how to install it, when he gets to the part at 14:06 where he puts in a piece of rubber mat simply install this printed part instead.