FLSUN T1 Vent Hole Drill Guide

The FLSUN T1 and T1 Pro motherboard are prone to overheating the stepper driver / capacitor resulting in failures.  The stock upper housing has a fake vent pattern to mirror the activated carbon ventilation from the T1 model.  A common modification discussed on the FLSUN discord is drilling these dimples out for proper holes.  This allows the motherboard cooling fan to pull in air, but the holes aren't very well aligned with the fan.  This drill guide is used as a template to expand the pattern above the fan keeping a stockish appearance.

I drilled the existing dimples out using a 2.2mm drill bit.  The large holes in the guide can then be aligned with holes in the cover.  With the drill guide on the inside of the cover, M2 screws can be installed from the outside to align and secure drill guide.  Drill 1.5mm holes from the inside to the outside.  Once all the holes are drilled remove the guide and drill 2.2mm holes from the outside using the 1.5mm pilot holes.  This gives a clean uniform appearance to match the holes drilled into the dimples.  Once all the 2.2mm holes are drilled use a 6mm drill bit to cleanup/chamfer the interior of the holes to remove any burrs.