My apple slicer had no cover to protect its blades or to protect other things in the storage drawer.  This snap fit cover does both.  Dimensions are included to make sure it fits your apple slicer.  I printed it with PETG.  PLA might also work but there is more risk of the fingers breaking.  If you try a PLA print, please post your results.  This design prints with no supports.

The inch dimensions of my slicer are :

Bottom diameter 104 mm or 4 inches

Top diameter 107 mm or 4.25inches

Height 17 mm or 0.67 inches