1 180° Servo MR996 This is the servo I use, nothing special, but MG90S servos are definitely too weak ... 😉 1 M3 Lock Nut Prevents the screw on the cutter arm from loosening over time. 5 M3 Washer ...

Low Profile Digital Servo: Compact and lightweight, ideal for 1/10 RC cars and robots. Durable construction: Features full metal gears and dual ball bearings for smooth operation. Optimal ...

It does this with a load cell, stepper motor, and ball screw, all under microcontroller control. Pull the string through, let the machine tension it, clamp it down, and then move on to the next row.