Qidi X-Plus 3 Back Corner Homing Stop Blocks

If you want to change the homing of the Qidi X-Plus 3 to use the back corners (Y = 280) instead of the front corners (Y = -24), you will quickly realize there is nothing but the back of the tool head to bump against.

(Why home to the rear corners? You may want to reduce the strain on the PTFE filament feed tube or, like me, you may want to add a filament cutter to the tool head, and need to keep the front-left corner excluded from regular motion.)

This model contains two blocks, handily labeled “L” and “R” that insert into the rear corner gantry blocks, and are held in place with an M3*25 cap head screw. You will need to drill a 2.8mm hole, using the block as a guide, in each rear block. The wall you will drill into is less than a mm thick, so it doesn't take much effort. Then, screw in each block, only putting a hint of torque on each screw, to not strip the hole.

Once installed, you have an equal surface on both sides of the gantry for the machine to home to Y = 280, without putting torsion on the gantry.

You will need to change the printer.cfg file like so:

[stepper_y]
position_min: -24
position_endstop: 280
position_max: 280
homing_positive_dir: True

Save and restart Klipper, and you are ready to go.

If you want to home the X axis to the right, use my other homing mod.

CAD for these models is available on Onshape, here.

Note: I printed mine with 4 walls and 20% gyroid infill, just to make it nice and stiff.