Giving My Longer LK5 Pro Automatic Bed Leveling: Installing a 3D Touch on the MKS Robin E3 V1.1

October 2026 · 3D Printing · Marlin · STM32 · Hardware Hacking A practical account of installing a BLTouch-compatible probe, debugging a firmware that wouldn’t boot, and finally getting a good first layer across a 300 × 300 mm bed. I bought a 3D Touch-style probe for my Longer LK5 Pro because I wanted something