It looks like this Part has been superseded by LEGO Part 3942c Cone 2 x 2 x 2 [Completely Open Stud].
Click on a colored part below to see the Sets and MOCs that use part 3942b Cone 2 x 2 x 2 [Blocked Open Stud] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.
There are 4 Mold variations of part 3942b - Cone 2 x 2 x 2 [Blocked Open Stud] in the database, in use between 1985 to 1993. See Molds and other related Parts.