Trim designed for the excellent build-your-own mechanical keypad (https://www.boltind.com) created by Ian at Bolt Industries.  I think the trim gives the keypad a more finished look while adding more color and personalization to the keypad.

Assembly

• Loosen the screws holding the top of the keypad on and then simply snap the trim to the posts.
• Where the two pieces of trim meet in the front of the keypad, slot the triangle tab into the slot of the right-hand trim. 
• Once installed, tighten the screws.

Other BMK Prints

• BMK Snap-on Magnetic Trim - https://www.printables.com/model/227225-bmk-snap-on-magnetic-trim
• BMK Snap-on Keyboard Trim - https://www.printables.com/model/227221-bmk-snap-on-keyboard-trim
• BMK Attach Keypad to Keyboard Right Side - https://www.printables.com/model/229367-bmk-attach-keypad-to-keyboard-right-side
• BMK Attach Keypad to Keyboard Left Side - https://www.printables.com/model/229372-bmk-attach-keypad-to-keyboard-left-side