There is no json file for the mob spawner, so you can't make a custom model for it
Comments 3
Fixed in 14w19a. There are two files for mob spawners :
mob_spawner.jsonmob_spawner.jsonand
mob_spawner_cage.jsonmob_spawner_cage.json
MC-51109
mob_spawner.json is missing
Resolved
Fixed
2
(Unassigned)
Unconfirmed
block-model, json, resource-pack
Minecraft 14w11b
Minecraft 14w19a
Retrieved
Is this still a concern in the current Minecraft version 14w19a / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.