Recently, the author of the YouTube channel Peep Cosplay presented a replica of the famous tool from the Deadp Space franchise.
The blogger recreated the plasma cutter — in the original game, engineer Isaac Clarke used it to "slice" necromorphs. The alternate mode allowed him to fire a blade.
This replica includes a "rotating saw" and is capable of changing shape:
Earlier, Peep Cospla showed a replica of a laser weapon that also supported several "modes":