this is the slider I used to build up my delta printer with MGN12H, 8mm lead screw and a Smart Effector in combination with a DuetWifi.
On top of the slider, there is a little hole, suitable for the magnet of an endstop.
I used IGUS 8 mm leadscrew with 15 mm pitch. The mount holes on the bottom of the slider are fitting to the JFRM_ZB_0001_HH08x15. This is a Zero-Backlash nut.
Azetronik 3D Hexagon Black
I used ASA filament because of the temperature resistance, but any other will be fine.
PET-G is much more easy to print, but not suitable for a enclosed build room.