This is the comlink seen on the Mandalorian Episode 7. It is based of the old TK comlink but in the show its slightly different. Color is gray silver and the bottom cap is longer. You will need the Middle cylinder to complete the set:
https://www.shapeways.com/product/RYSQPERU8/comlink-cylinder
Tip: you can save a few bucks by printing in white and paint yourself. Printing in color adds a premium.