Hi, Try flashing the firmware for the BLtouch before you connect the pins to the mainboard. This helpt for me.

Well, I have to admit, 1.4.1 is not working correctly. Guess, I do not have the correct 'extensions'. However, all the bins from the zip are booting. Give it a try. One will fit your needs

@Tim33 Check to make sure the belt is in the middle of the aluminum slot from front to back. If the rollers are set correctly, assuming there is no warp in the Y axis profile aluminum, they should not bind differently along the beam. Things to check: Belt position Belt tension Adjustment of the pinch roller under the print bed Make sure the wiring and harnesses are tucked out of the way Good luck! YouTube is a great resource for Ender machines.

@tfb_46 The extruder jumps during printing, please loosen the screw of the extruder properly Refer to the video to clean the Heatbreak: https://youtu.be/qb0ar30cUWY It is normal for the extrusion gear to have a little consumable residue, and it needs to be cleaned in time to prevent slippage. If the extruder jumps after adjusting the screws of the extrusion clamp, please provide a video for analysis

@Eldrod Hi, Use the original extruder, it is not recommended to modify the extruder.

@ewashburnaf I realize that, but future firmware (Marlin 2.x) should include it among other missing features of the Ender 3 and PRO.