Screwdriver Handle for regular Hex bits and for Leatherman's flat bits (which are in turn compatible with the regular hex hole). This handle was meant to be used with Leatherman's bits so the hole design is flat to better hold onto the tools... however it also has a regular hex hole on the opposite side for plugging normal bits. This is the 2nd version of this handle, the first one was a prototype and it was quite large, so I reduced it to about 1/3 of its original size and tried to keep it as ergonomic as possible.Rafts: Doesn't MatterSupports: Doesn't MatterResolution: HighInfill: 25%Notes: Recommended settings are 25% infill with a honeycomb structure, or a 35% infill with rectangles or lines.I have only tested hexagonal style of infill.