Slim (2U) stackable drill bit tray (2-8mm)

Motivation: Inspired by Peter Hall's Gridfinity 10 drill bit holder, 3x2x2u, but designed from the ground up, to achieve full stackability (even with 8mm bit) at 2U height Design: Fits drill bits from 2-8mm, with diameter of slots increasing (by 0.5mm) to avoid the smaller bits moving around, if tray is stacked and rotated to vertical/sideways position. Customize:ParameterDefaultDescriptiontop_clearance0.5 mmAmount of clearance to leave above drill bits. Increase if you're having trouble stacking. Reduce to keep bits more secure.slot_tol0.2 mmExtra diameter added to all slots. Increase if your bits don't quite fit, e.g. due to printer calibration.