Assemble: 

1. Print all files and get 2 Springs (can also add another 2 for extra)
2. try if the piston fits, if not sand it
3. 2 springs each about 1cm in the bumper base-slots
4. add the suspension piston and use a screw or 3d filament to secure it (like a splint)
5. glue the bumper on top
6. (optional: add extra 2 springs on top)

Print:

• I used the Ender 3 v2 Neo
• I used PLA with 10% infill
• Printing time is about 23min each

Scale:

• 8cm wide, about 4.5cm long