2. Filament. One roll of filament ( 1kg) is enough to print the hand and the forearm. Costs about 30 EUR.
3. Servos. Depends on where you source them from and what quality you want. You need 6 servos. 10-20 EUR each.
4. Aduino. For just the hand an Arduino Uno is good enough. 15 EUR.
5. Small other things like cables, batteries, battery charger and so on. This quickly adds upp. 50EUR ?
6. Tools. Depends on what you already have. Drill and drill bits. Taps, Screwdrivers.
My guess is that somewhere between 100-200 EUR for parts ( 2-5 ) that goes into the hand. Depends very much on the servo cost.