Duender Y axis endstop mount

Reuse an Ender endstop for your Duender y axis: 

• use the printed part to mark and drill (optionally tap or install heatset inserts) the top of your left (or right) motor hold bracket for 2 M3 screws
• use M3 hardware to loosely mount the printed part, then mount an Ender endstop; use M2.5 hardware, or drill the endstop mounting holes out for M3 hardware
• find a suitable trigger point for max y travel, where the x extrusion activates the y endstop, and tighten down the printed part to the bracket