CORE One Brass Nozzle Wiper – CryoGrip Pro Glacier Compatible

A compact brass-brush nozzle wiper for the Prusa CORE One, designed around the BIQU CryoGrip Pro Glacier spring steel build plate shown in the photos.

I wanted to use a replaceable brass brush for nozzle cleaning instead of the Bambu Lab-style silicone pads commonly used in nozzle-wiper mods. The holder positions the brush close to the bed while leaving clearance for the CryoGrip Pro Glacier sheet and its front tab.

Features

• Brass-brush cleaning: brushes filament residue from the outside of the nozzle.

• CryoGrip Pro Glacier clearance: the compact brush position accommodates the sheet shown in the installation photos.

• Replaceable brush: the brush slides into a retaining channel and is secured with a screw and a captive square nut.

• Stable mounting: an integrated support rib rests against the bed edge to help stabilize the holder.

• Single-piece construction: sloped transitions make the body easier to print.

• STL files: print the supplied model.

Brush sourcing and required hardware

Search AliExpress for “Brass Wire Brush”. Choose a brush with a plastic-backed head similar to the one shown in the photos, and check its dimensions against the model before purchasing.

This holder uses half of a brush head. I cut the original head crosswise into two shorter pieces and used one half.

You will need:

• 1 printed holder

• Half of a brass wire brush head, with a plastic base approximately 20 mm long

• 1 square nut sized to fit the nut pocket beneath the brush

• 1 matching retaining screw

The brush used during development had a bristle bundle approximately 9.5 mm wide.

Assembly

1. Cut the brush head crosswise into two shorter halves. Smooth the cut edge and remove any loose bristles or cutting debris.

2. Insert the square nut into the slot beneath the brush channel, aligning its threaded hole with the retaining screw hole.

3. Slide the shortened brush head into the retaining channel.

4. Thread the retaining screw into the square nut and tighten it until the brush is held securely. Avoid overtightening against the plastic brush base.

5. Fit the holder onto the front-left bed-support frame as shown in the photos, with the support rib resting against the bed edge.

6. Check that the CryoGrip Pro Glacier sheet can be installed and removed freely, then calibrate the wiping path to the actual brush position.

Suggested print settings

• Material: ASA

• Layer height: 0.20 mm

• Perimeters: 4

• Infill: 40%

• Orientation: use the supplied STL orientation.

These are suggested starting settings. Check bridges and overhangs in your slicer preview before printing.

Automatic cleaning before each print

In PrusaSlicer, open:

Printer Settings → Custom G-code → Start G-code

Following the Path Generator’s installation method, locate the existing nozzle-cleaning command. In the profile documented by the tool, it is:

G29 P9 X208 Y-2.5 W32 H4

Replace that cleaning command with your verified brush-wiping sequence. Keep the surrounding homing, heating, and bed-leveling commands.

Save the modified printer profile under a new name and re-slice your models with that profile.

Example wiping sequence

The following coordinates are specific to this setup. Run this within the printer’s start sequence, after homing, with absolute XYZ positioning (G90) active and the normal heating logic in place.

Verify the brush position, wiping height, and approach/exit movements at reduced speed before using the sequence automatically.

; Start Prusa CORE One/+ nozzle wiping sequence
; REF: X42.00 Y-16.00 Z8.00
; GEN: 2026-10-16 17:02:53 UTC
G0 X42.879 Y-18.298 Z5.00 F10000
G0 X19.991 Y-15.015 Z5.00 F10000
G0 X19.900 Y-18.571 Z5.00 F10000
G0 X43.244 Y-14.650 Z5.00 F10000
G0 X43.335 Y-18.207 Z5.00 F10000
G0 X19.809 Y-14.924 Z5.00 F10000
G0 X19.809 Y-18.663 Z5.00 F10000
G0 X43.062 Y-14.650 Z5.00 F10000
G0 X43.335 Y-18.298 Z5.00 F10000
G0 X19.718 Y-14.924 Z5.00 F10000
G0 X19.809 Y-18.663 Z5.00 F10000
G0 X43.062 Y-14.650 Z5.00 F10000
G0 X43.518 Y-18.480 Z5.00 F10000
G0 X19.900 Y-14.833 Z5.00 F10000
G0 X19.991 Y-18.754 Z5.00 F10000
G0 X43.153 Y-14.741 Z5.00 F10000
G0 X43.426 Y-18.480 Z5.00 F10000
G0 X19.809 Y-14.741 Z5.00 F10000
G0 X19.991 Y-18.480 Z5.00 F10000
G0 X43.244 Y-14.741 Z5.00 F10000
G0 Z9.00 F10000 ; z-lift
; End nozzle wiping sequence

Create your own wiping path

You can generate a custom path using the community-made Nozzle Wiper Path Generator.

The tool was designed for silicone wiping pads. When adapting it to this brass brush, calibrate the actual brush position and bristle height, adjust the contact depth, and keep the path within the usable bristle area. Use the tool’s reduced-speed test before adding the generated sequence to your start G-code.

This is an independent community project, not an official Prusa upgrade.

Designed and built by DIYOracle — [email protected]