Allen key handles, for both allen keys that are supplied with the Bambu Lab printers. I printed it on my P1S, This profile (which the original maker doesn't have) has pauses at the right layers to insert the keys. Also this profile has the keys on 1 plate, instead of 2 like the other one.

Be sure your allen keys are not bent. If they are bent too much, they might not fit. Under normal circumstances, there is a bit of play. NOT compatible with P2S and H2 style hex keys! Round ones do not fit. Only the ones in the photo. If you have a H2 or P2S, use these:

https://makerworld.com/models/2479925

It wil print little support pieces for the keys to sit on, after printing you can throw them away.

There are 2 automatic pauses:
At layer 23: Insert the small (1.5mm) hex key, resume after

At layer 30: Insert the big (2mm) hex key, after this let it finish printing like normal

This profile also uses Gyroid infill, Which is better for your nozzle and more succes garantee, with grid your nozzle will bend and your print can be knocked loose since it will cross over previously printed lines.