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Problems with stock gear with no screw on Ender 3 pro

3D Printing Asked on February 6, 2021

I am very new in the 3D printing scene.
After a lot of searching for my specific problem (and didn’t find any answers, of course) I decided to reach out.

I bought a Creality Ender 3 Pro in November and after a few days of lovely prints
I decided to upgrade the printer with a glass bed and "Aluminum Dual Gear Pulley Dual Drive Extruder Kit".

The Problem, as you might expected already, is with the installation of the dual gear extruder. I have watched a dozen of YouTube videos, and all of them have something I don’t – a screw in the stock gold gear on the extruder motor.

How can I install the Aluminum Dual Gear Pulley Dual Drive Extruder Kit if I take the gear out? Should I try remove it with force?
Please if someone has come across the same situation, that there isn’t a screw In the stock gear on the extruder motor and mange to take it out, please tell me.
I’m adding a picture so you understand what I mean.


4 Answers

Heating it proved futile in my case (I didn't have a blowtorch either), I was able to get the gear off by using a Dremel, I also flattened a small side for the screw.

However, to my extreme frustration, I found out that the actual height of the shaft is not long enough to reach the dual extruder's filament hole and thus had to order another motor.

Answered by Neo on February 6, 2021

This is an older Ender 3 Pro, they at one point came with these press-fit gears, these are not intended to be removed which is a poor design decision. I would recommend buying a new motor than going through the hassle of removing it.

Answered by Barrel on February 6, 2021

This brass extruder gear is either press fitted (see other answer) or hot crimped onto the shaft. Brass has about twice the thermal expansion rate as stainless steel, so you could heat the gear while cooling the shaft (e.g. stepper upside down with the shaft in water, heating the gear with a small torch lighter, a makeshift aluminium foil shield could be used to protect the stepper base) to get the gear off.

Grinding it off would be easier (or even more easy is to buy a new stepper motor) as when you get the gear off, the shaft is round, so you need to grind a flat spot on the shaft anyway to make sure the dual extruder gear can be screwed on tightly.

Answered by 0scar on February 6, 2021

If you cant see any grub-screw on the extruder gear, it's likely that it has been permanently press-fit onto the motor shaft. It is possible to remove the gear if you have something like a Dremel to cut it off, however, do note that it would be a permanent modification, and that your warranty (if you had any) would be void. If you do go this route, be careful not to Dremel into the shaft of the motor, as this would likely cause the new gear to not fit properly.

If this is a new printer, I would recommend assembling it with the stock extruder assembly first, and ordering a secondary extruder motor without the gear press-fit onto its shaft. Then you could swap them out and not need to worry about damaging the existing motor.

Answered by craftxbox on February 6, 2021

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