Micro bit (4mm) screwdriver handle

Remixed BamBam's very useful mini bit handle to work with 4mm micro-sized bits.The first plate has the perfect size on my printer. It will be slightly too tight at first, work a bit in and out a few times to loosen it up. It's better this way than it starting off too loose.I also included versions with tiny 0.06mm adjustments to the hole size in case the first one doesn't work for you. If you need to adjust further I'd suggest scaling all 3 at the same time to find the right size, a tiny 0.03-9mm adjustment can make a big difference.The key setting for size precision is “outer walls first”.