Originally posted by umop-apisdn:

Originally posted by gomisan:

Your crafting bench etc are too close

Spawners don't care about workbenches, campfires, etc.

According to the wiki, fire geysers are not spawners; they are spawn points, and as such suppressed by workbenches.

I once placed a workbench right next to every one of a bunch of surtling spawners, and nothing ever spawned.