I tried to install 3dTouch (clone of Bltouch) on the 4Max but i failed, so i made it with a capacitive Sensor. A Inductive sensor wouldnt work because the Ultrabase is made of Glass. The glass is messy because i used glue for adhesive.

I think 15 Dollar for a ABL function on a 300$ Printer is amazing.

You need to install a pullup resistor as you can see in the schematic here.

You can use my Firmwareconfiguration and try out if it works for your system.

My video https://www.youtube.com/watch?v=jAz07Jl_bgg&feature=youtu.be

Choose between stock stepperdriver version / other stepperdriver version like TMC2208 or others.

https://github.com/dplane/Anycubic-4MAX-Firmware

For further instructions watch Toms video

https://www.youtube.com/watch?v=EcGFLwj0pnA

If you want to buy the same sensor like i did. LJC12A3-5-Z/BX
Amazon Europe link: https://www.amazon.de/gp/product/B071J1JPQV/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Amazon com

https://www.amazon.com/Woljay-LJC12A3-5-Z-BX-Capacitive-Proximity/dp/B06Y4MCSQY/ref=sr_1_1?keywords=LJC12A3-5-Z%2FBx&qid=1552164212&s=gateway&sr=8-1

You will also need some of these https://www.amazon.com/DIYmall-10PCS-...

*I dont get money from amazon