Nozzle grinding a hole in build plate

[zogthegreat]

Hi everyone!

I just noticed that when my P1P is doing it’s start print routine, the nozzle rubs against the back of the build plate and is literally wearing a hole into it.

Not only am I concerned about the build plate, but the nozzle also. Here is a video of what is going on:

Video of nozzle grinding the plate

Here is the start gcode:

; filament start gcode
{if (bed_temperature[current_extruder] >80)||(bed_temperature_initial_layer[current_extruder] >80)}M106 P3 S255
{elsif (bed_temperature[current_extruder] >60)||(bed_temperature_initial_layer[current_extruder] >60)}M106 P3 S180
{endif}

{if activate_air_filtration[current_extruder] && support_air_filtration}
M106 P3 S{during_print_exhaust_fan_speed_num[current_extruder]} 
{endif}

Any suggestions as to what is going on?

Thanks!

[PrinterMcgee]

It’s the “wipe zone”… it’s normal.

[zogthegreat]

Thanks for the info, @PrinterMcgee . I still think that it’s weird, but as long as it doesn’t destroy my plate or nozzle, I’ll live with it.

[Wsquared58]

That rubbing of the nozzle is standard. It would be nice if there was a description as to why they do it but have not seen an explanation so far.
I think they do it sort of polish the flat surface of the nozzle to make sure it is clean and flat. So that the top of each layer is flat rather than irregular. So that the next pass across, the bead has a good flat top to adhere to.

[JGrimm]

Yeah as people said it is the nozzle wipe zone. It’s normal.

[Wsquared58]

That is a question that pops up on the forum routinely.
I think I asked the same question a year ago.
Courtesy of the Wiki

Introduction to the Build Plates

Scroll down to Appendix

Wipe zone on the build plate

Before printing, there may be some filament residue remaining on the nozzle, and if not cleaned, it can cause surface defects on the printed object. Therefore, the nozzle is first wiped on a nozzle wiper before printing starts and then repeatedly wiped in a specific area on the build plate (wipe zone). This helps to clean the filament residue on the nozzle and stabilize the chamber pressure inside the nozzle. This prevents surface defects on the printed object due to filament residue on the nozzle.

For the X1C, P1S/P1P, and A1 printers, as the nozzle comes into direct contact with the build plate, there may be some “wear” observed in the wiping zone (as shown in the image below). However, this phenomenon does not affect the functionality of the nozzle or the build plate.