Nozzle Wiper Mk3/S/+ / Mk3.5 / Mk3.9 / Mk4/S*

Nozzle Wiper Attachment for Prusa Mk3/S/+, Mk3.5, Mk3.9 and Mk4/S*

* Upgraded from Mk3, with old bedframe design

Description

As I liked this nozzle wiper for the Core One (https://www.printables.com/model/1365040-prusa-core-one-nozzle-wiper) and had some spare A1 nozzle brushes, I also wanted to implement them in my  Mk3.5s. I wasn't 100% happy with how the brushes were placed on the print area in all of the models, so here's my own version. I also implemented feedback from the remixed original file, stating that the high hinge collides with the extruder hardware, so my assembly is as low as possible.

This attachment is using a B******b A1 (not mini) silicone brush (or favourably cheaper non-brand alternatives). Check if they have the adhesive strip on the bottom.

The only hardware is one M3x6/8mm bolt from your spare parts package, and a piece of 1.75mm filament (PLA works nicely)

Instructions:

Paste this gcode into your printer's Start G-code preset (Printers→Custom G-code→Start G-code in Prusa Slicer) at the position seen in the picture.

; start nozzle cleaning custom
G1 Z15
G1 X248 Y-4 F8000
G1 Z4
G1 Y25 F8000
G1 X250 F8000
G1 Y-4 F8000
G1 X251 F8000
G1 Y25 F8000
G1 X250 F8000
G1 Y-4 F8000
G1 X248 F8000
G1 Y25 F8000
G1 Z10
; end nozzle cleaning custom

You need to save it as a custom preset, e.g. as seen below:

Final notes / thoughts

This nozzle cleaning step could also be implemented e.g. after filament changes, you just need to be extra careful with part placement so it doesn't get crushed/pushed by or stalls the x-axis rod or extruder. I have not yet tested this as I don't really use filament changes, so no guarantees here. 

Happy printing! :)