You need 4 M3x10 or M3x15 screws (glueing is also possible) and a coil spring thats 50 mm in lengh. I used those: https://www.amazon.de/gp/product/B07NVDRNXL/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
The springs should be somewhat soft so the blades can be easily loaded and unloaded.
Can be printed without supports.
I printed it with a 0,6mm nozzle and 0,35mm layerhight on my Prusa Mini+.
The box can be lengthened or shortend if you want more/less blades or have springs that are different lenghts
The author hasn't provided the model origin yet.