CNC Z Probe (Customizable)
thingiverse
This is a highly adjustable probe used with standard switches (such as these: https://www.amazon.com/gp/product/B00MFRMFS6/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1). I encountered issues with distorted plywood on my 4x8 CNC, and decided to use a switch probe and bed height correction just like you would with an uneven bed on a 3D printer. It's designed to fit snugly under and around the spindle, with an opening for the endmill. The default settings work perfectly for a Makita compact router with a 1/4" endmill, but you can easily edit the settings in Customizer.
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