Nikon F-401s Dial Lock Button

Pretty much what it says on the tin. Should also work for F-401x. This button will simply fall off if the clear cover over the dials is removed or otherwise comes off, and replacements are unobtanium. This print requires a decent degree of dimensional accuracy from your printer but should otherwise be fairly straightforward to print on an FDM or SLA printer. I printed this from ABS because it's what I already had loaded into my printer but i can't see why you couldn't print it with PLA, PETG or any other material of your choice. Print with 100% infill, and depending on your printer and filament used you may want to use a brim to assist with adhesion given the small size of the print.