If you have made RFID-Sensors you have been fiddling with the amount of wires needed. Malte Schröder has help for you!
Malte designed a simple PCB to be placed between RC522- and Arduino-boards:
These makes assembling the unit a breeze!
How to order
Go to Malte’s shared project here, register and order. 3 boards will set you back with only 5-6€ so it’s definitely cost-effective. You need to register to Oshpark to order.
I have used Oshpark quite a lot myself and they have great quality so I can recommend their service too.