This is a stylish and easy-to-handle Hex key handle, available in five sizes: 1.5mm, 2mm, 2.5mm, 3mm, and 4mm. Print with a 0.4mm nozzle on a properly calibrated printer, using a brim if necessary. 

This design is intended for use with standard hex keys that have a 90-degree bend angle and cannot be used with stubby hex keys that have a 95-degree bend angle.

It is a reworked version of my previous design, with the following changes:

• Size indications in millimeters, which were highly requested, have been added to both the cap and the handle.
• By securing the Hex key on the handle side, the handle cap no longer loosens when you loosen screws.
• The handle size has been made the same, regardless of the Hex key size.
• Even more stylish than before!

How to EZ color change on PrusaSlicer:

Update: 
[19/08/2024]
I've also added handles without size markings.

[10/08/2024]
I loosened the thread tolerance by 0.1mm.