Being a military family moving from place to place these little door stop caps always goes missing, so I designed a parametric cap in fusion 360. Best printed in TPU but i did mine in PLA and they do the trick

for editing the F3d File

1. Open the file
2. go to modify → Change Parameters
3. measure your spring inner Diameter and Outer Diameter and Change the parameters to match (Be sure to add your Tolerance for your printer I used 0.15 for my p1s with Sunlu Filament)
4. Right Click DoorStop_ParametricV1 on the left of the screen → and export as .STEP
5. Print using .16 Optimal Standard Profile

Play With the Parameters if needed to suite your style

for commercial license of this or other of my models please consider checking out SilentYetiDesigns