Hot End Scrubber for MendelMax 1.5

by MishaT, published

Hot End Scrubber for MendelMax 1.5 by MishaT Jan 4, 2013
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Hot end scrubber made from a dremel wire cup brush I had laying around.

I have a problem with goop being melted onto the outside cone of the hot end, and with my new fan mount it is a pain to get at it manually to clean. So I designed this little guy to automate the process.

For this to work you need to have at least a 30mm gap between the edge of your heated bed and the side extrusion. I am using a 1in diameter dremel wire cup bit but something slightly smaller or larger could work as well, depending on how big of a gap you have to work with.

The mounting hole is sized for a M4 drop in t-nut, and there is a M3 set screw with nut trap. The shank of the dremel bit is 1/8 in diameter.


Print and install. You will have to move your X end-stop far enough so that the hot end can reach the wire brush, adjust height of the bit as desired and secure using set screw. I cut away half of the wires not facing the printer to make it easier to remove the purged plastic.

Here is my start-up gcode:

G90 ; Set to absolute positioning
G28 X0 ; Home X, X home is middle of cup
G28 Z0 ; Home Z
G92 E0 ; reset extruder
G1 E5 F100 ; Purge 5 mm
G92 E2 ; Reset extruder for retraction 2mm
G1 E0 F1000 ; Retract
G1 X20 F4000 ; Move to bed X0, 20 mm from X home
G92 X0 ; Set current X at Zero
G28 Y0 ; Move to Y0
G1 E2 F1000 ; Prime extruder 2mm
G92 E0 ; reset extruder

Video of a print start:

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This is awesome. I'm putting it on the to-do list.

Cool idea! Hopefully it does not break the nozzle.

I'm not too worried, if it was constantly brushing it might wear away the brass eventually but with a couple passes per print I don't thing it will damage anything.