These switch grips are made for the OG and OLED types.  I do not believe they will fit the switch lite. 

Each grip prints in two parts. 

You need 4x M3x10mm screws or epoxy glue to attach them together. 

The housing file must be printed as it is oriented in the print profiles/file.  Otherwise the part that clips to the top will be weak and break. 

I suggest printing the housing part in regular PLA or PETG.   Matte and silk are too weak for this part and it may break more easily.

I also highly suggest sanding the underside of the grip housing that makes contact with supports as it will be very rough.  If you don't have sand paper, a nail file will also work.  The roughness could possibly scratch your joycon housing so please give it a quick sanding.  I used 80 grit and it smoothed it out very quickly. 

These are a remix from another person's design.  [https://www.printables.com/model/402105-separate-nintendo-switch-joy-con-grip](https://www.printables.com/model/402105-separate-nintendo-switch-joy-con-grip)
 

Changes I made:

I made the clip part thicker 

Added a texture to the grip in a leaf pattern style

Separated the part into two pieces for better printing outcome

Added a ridge to the clip part for easier removal

These grips will still allow the switch to be docked. 
These can also be used as a stand but it tips over very easily so use this feature at your own risk.

This model is a remix but I give the following permissions that align with the original creator's licensing.

You can:
Sell printed models (online or locally)
Create remix versions with attribution

Please don't:
Sell the model files
Claim the model as your own
Claim remixes as solely your own