Drywall Hole Puncher
thingiverse
Designed this thing to punch holes in drywall from the rear so any holes that needed to be cut are perfectly aligned. There's a small chamfer that will keep the bolts in their place when tightening. I drilled a small hole from rear to front and started to cut from the front of the drywall to prevent any ugly marks when the hole saw exits the drywal.
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