OLD:
Minecraft.getMinecraft().getRenderItem().getItemModelMesher().register(Item.getItemFromBlock(TKBlocks.misc), 0, new ModelResourceLocation(Knowledge.MODID + ":" + "tk_misc.qs_cons", "inventory"));

ModelBakery.addVariantName(Item.getItemFromBlock(TKBlocks.misc), "tknowledge:tk_misc.qs_cons", "tknowledge:tk_misc.qs_block");

NEW:

ModelLoader.setCustomModelResourceLocation(Item.getItemFromBlock(TKBlocks.misc), 0, new ModelResourceLocation("tk_misc.qs_cons", "tknowledge:tk_misc.qs_cons"));