5.25m Drill Needs Bigger Range
When you are trying to create a drill head with the 5.25m drills, they cannot be easily or intuitively placed close enough together to make an efficient drill head. If you use standard placement distances to align them in a row, the gaps between the drills are too large and leave gaps in the area that you are trying to mine, preventing you from going more than surface deep. Even when you place small drills between the heads, it still leaves voxels outcroppings that prevent your ship from smoothly boring through. 3.5m and 5.25m drill heads don't seem to function very well together in general, with them seemingly not mining more than a meter or so deep. My suggestion is that they either receive a small hit box so that they can be place closer together, or they drills themselves receive a mining area boost so that their mining range overlaps better
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