the original conectors fell of to easy.
by this one the contacts go all the way to the bottom.

also switches that make something stop have to be NC,
and start NormalyOpen.
this makes sure nothing can move while a cable is broken/disconnected.
the correct functionallity is given by inverting the signal in the software.
if THIS optical switch loses only its suplyvoltage,
the signal becomes undefined.

cura made from my 2 slt's 4 different versions,
but since i got mine to work i leave further developement to you.

ps.: allen-key as limit for the mechanical endstop until the optical ones are built in.

e0 @ 230°C
.4mm nozzle
50mm/s
bed @ 70°C (shut down after first layer, still 52°C when done)
.3mm bottomlayer
.2mm layers
brim 1lines
drilled up for the femal contacts
cables glued in