Prusa XL – ScrubbyXL: Automatic Nozzle Wipe MBL

ScrubbyXL is an automatic nozzle-wipe add-on for the Prusa XL that keeps the nozzle tip clean where it matters most: before Mesh Bed Leveling (MBL) to help achieve a cleaner first layer, and during long prints to reduce filament buildup on the nozzle tip that can lead to failed prints.

It’s designed as a reliability-focused mod for real-world printing—especially long jobs—where small blobs or residue on the nozzle can accumulate over time and eventually cause surface defects, collisions, or a print going off the rails. Use it as a preventative “maintenance move” built into your workflow, rather than waiting until a problem appears.

You can integrate the wipe routine directly into your slicer via G-code: a small Start G-code tweak wipes the nozzle before MBL so the nozzle probes the bed cleanly, and optional in-print wipes can be triggered every N layers (user-defined) to keep the tip free of buildup during long jobs.

This is a remix. The original is from @Ro3Deee. Thank you for the great basic design <3

Choose your version:

• Mounting hole size: M3 / M4 / M5.
• Silicone brush size: A1 or A1 mini.
• Mounting style: magnetic or fixed (screwed).

Magnetic mount:

• Magnets can be inserted during printing (pause-at-layer) or glued in after printing. (choose the version you want)

Fixed mount (no magnets):

• A no-magnet version is included for a fully screwed, rigid installation.

Recommended setup:

>> I recommend the magnetic version with inserted magnets and the A1 mini brushes <<

Magnetic mounting is the better choice, because on the right side (Tool 5) the toolhead is loaded/unloaded directly above the wiper area—so it’s useful to remove the brush quickly when needed.

For best results, mounting wipers on both sides is recommended. That said, you can also run only one brush on a single side—just adjust the G-code accordingly.

Material List: 

• A1 mini silicone brushes (with glue stripe)
• A1 silicone brushes (with glue stripe)
• Magnets 50x10x3mm 
• T-spring-nuts M3/M4/M5 - 3030
• Hexagon Socket Button Head Screw (Lenght 12-14mm)
• 3M 2090 Blue Tape
• Strong Adhesive Glue for Silicone, Plastic, Metal, Glass
• Super Glue TPR/ TPU/PVC/ ABS/Latex/Leather/Wood/Silicone

Print Settings:

• Material: PETG, ABS, PC
• Layer high: 0.2mm
• 3 perimeters
• 20-50% Infill
• Quality mode
• Use support only for the silicone brush inlets
• Consider using a brim

Tip: When overprinting the magnet in the mounting plate, apply some tape to the operable side to ensure better overprinting. (3M 2090 blue tape is best)

Be careful when handling the magnets during preparation; if they attract each other and collide, they will break. This unfortunately happened to me as well. Therefore, it's advisable to have a few spare magnets. Of course, the problem no longer exists once they are installed.

When inserting the magnets, a pause must be set in the slicer at the correct height:

• Pause for the mounting plate: 4.2 mm height
• Pause for the brush holders: 52.6 mm height

IMPORTANT: It's best to mark the correct polarity with a permanent marker to avoid mistakes :)

Mounting Instruction:

Remove the supports/brim and place the brushes in the holder. If your brushes don't have an adhesive strip on the underside, you can use some glue. However, the brushes will also hold well without glue.

Lower the heated bed by about 6 mm. A print plate must be in place. The brushes should be about 1 to 2 mm away from the print bed. Then you can adjust the height. Deactivate the printer's motors and slide the tool towards the brush. The brushes should make good contact with the nozzle—not too much and not too little. Take your time and do it properly :)

G-Codes:

You find all G-Codes here: 

https://www.printables.com/model/1594269-prusa-xl-scrubbyxl-automatic-nozzle-wipe-mbl-durin