Ender3NozzleCleaner

Easy and automatic nozzle cleaning for and Ender 3 Pro with an inexpensive brush.

I recommend looking up information on the https://github.com/renatobo/Ender3NozzleCleaner repository.

PETG is quite stringy and having strings of filament on your first layer is quite annoying. To avoid babysitting each print, I looked at a couple of designs on thingiverse but none really worked well for an Ender 3 Pro.

What you need

• Cheap brass brush - in this design I used a sub-1$ one from Harbor Freight
• 2 or 3 M1.7 screws (or equivalent very small and short screws)
• T-Nut (you can 3d print this M3 Tnut )
• Brush support

How-to

• 3d print brush support (both STL and Fusion360 files are provided)
• 3d print Tnuts (or buy/reuse other ones)
• Cut away the brush handle: keep the part where the brass brush is
• Extend limits of your printer: in my case, I found that I can safely extend X to 248 mm
• Write a sequence of Gcode commands that moves the head back and forth (see examples at https://github.com/renatobo/Ender3NozzleCleaner )

End result

In action:

• Overall
• Closeup

Tip: Klipper Macro for G12

A good option is to define the cleaning code as G12 and use a macro in klipper.
See code at g12_macro_klipper.cfg

Tip: mounting the support

The support it works best when the display is removed. If the display is not removed, you need to offset Z commands upwards in the examples provided.

Tip: extending printer bed size

I use Klipper and I simply modified the printer.cfg file to account for a larger X dimension

[stepper_x]#...position_endstop: 0position_max: 248

Do not modify your slicer, it might think there is more bed than there is