30mm axial coils vs. 25mm axial coils:
Which is better: a 25mm axial coil or a 30mm axial coil? It all depends on your setup and preferences. The main down-sides to going with the bigger coil are very few. One is that there is more mass, which takes slightly longer to get up to temperature and also can weigh down a very small rig (or “banger hanger“). This can be remedied in most cases by making sure that the e-nail coil is pointing back towards the rig instead of away from it (see pic).
This keeps the center of gravity balanced on your dab rig and will help prevent it from tipping. Another handy piece of gear that helps with this is a drop-down adapter. One more important thing: please make sure that your e-nail coil cord is not in a place where you might snag it! Cats and e-nails sometimes don’t mix. It’s up to you to decide whether you are too accident prone for an e-nail or are not able to create a safe environment for your setup to reside.