Removal of Bondtech gear lock screw with snapped socket
 
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marcus.w3
(@marcus-w3)
New Member
Removal of Bondtech gear lock screw with snapped socket

Hey there!

I have a more or less minor issue with the Bondtech gear lock screw. I upgraded yesterday from the Prusa i3 MK3 to the new MK3S Extruder. During the rebuild and adjustment for the new MK3S Extruder, unfortunately I shear off the socket of the M3 x 2mm lock screw.

The Bondtech gears are more or less in a acceptable position however its not perfect. The screw fixes the Bondtech gear pretty good (at least it seems so...) and the print quality is also quite fine. So there is no immediate intervention necessary.

The question now: Is there a good way to get off the M3 x 2mm lock screw with the cropped socket? I plan to replace the screw during the next bigger maintenance in 6 months or so. Or if the print quality decreases to much in the next time because of bad filament transport. I don't want to damage the extruder motor or the 50€ Bondtech gears by trying to replace a damn ~25-50 Cent locking screw.

Currently my idea is to use some kind of stripper pliers and a second pliers to hold the motor rod and to pull off the Bondtech gear form the motor rod. Then fiddeling out the old screw. But I don't know if this is already to invasive and will damage the motor and the expensive gear.

Thanks for the advice!

 

Napsal : 06/01/2020 4:36 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
RE: Removal of Bondtech gear lock screw with snapped socket

I had the same problem when switching to a Bondtech extruder.
The screw head was destroyed (from factory) and I could not use any hexagonal key.

So I quickly heated the gear with a gas flame (100 - 150 ° C) and then with a pliers (and a little force) pulled it off the shaft.

Bear MK3 with Bondtech extruder

Napsal : 06/01/2020 4:50 pm
marcus.w3 se líbí
marcus.w3
(@marcus-w3)
New Member
Topic starter answered:
RE: Removal of Bondtech gear lock screw with snapped socket

@rhdreambox

Thanks for your great idea! I may try exact the opposit! I may could throw the extruder motor + Bondtech gear into the freezer or the fridge so the metal shrinks a bit so I can pull of the bondtech gear by hand. When the gear is off the motor rod, it should be easier to fiddle out the screw with your pliers technique since it isn't under pressure anymore.

Thanks again for pointing me on the temperature method! 😀 😀 😀 😀 

Napsal : 06/01/2020 9:04 pm
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