I first saw this on Temu. Thought it would be good for cutting long strips or setting really close to the blade for trimming just a little, like a door top or bottom. The base measures 330mm x 35mm x 18mm and will fit diagonally on a Sunlu S8 or Creality CR-10. If you have a smaller saw soul plate and printer you can use software to cut a section from the base and rejoin it without disturbing the integrity of the end pieces. 

The jaw and both base end pieces are reinforced with four 3mm x 20mm screws and nuts. One 5mm nut is use in the base for the screw (forgot to add it to picture). I glued a 3mm washer on the jaw for the screw end to ride upon. The screw is a hex head 5mm x 60mm bought from Lowes. Plate range is about 11 ½" to 10". Safety: Disconnect any power from the saw while setting up. Make sure jig is parallel to the blade to prevent pinching and kickback.