3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: [email protected] or [email protected]
There are CAD communities available at: [email protected] or [email protected]
Rules
-
No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
-
Be respectful, especially when disagreeing. Everyone should feel welcome here.
-
No porn (NSFW prints are acceptable but must be marked NSFW)
-
No Ads / Spamming / Guerrilla Marketing
-
Do not create links to reddit
-
If you see an issue please flag it
-
No guns
-
No injury gore posts
If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
view the rest of the comments
Just to check I understood you correctly:
You want to replace your extruder and you bought an extruder without stepper motor. Now the original stepper motor has a gear press-fitted onto the shaft instead of a flat side. Correct so far?
There are two things you can do:
The first option is easy, but requires a tool.
The second option is also easy: You'll just need to look for a Nema17 motor, that's basically it. It should not be a pancake (=flat/small) one, because they are not powerful enough. Low stepping angle (0.9°) is advantageous but not required. You are going to have to tune the extruder steps per mm anyways, since it won't be exactly like your old extruder, so it hardly matters whether the difference between old and new is small or large.
The third option will yield the best returns. These cheapo single-small-drive-gear extruders without gearing are just bad, especially if you add the loss of control you get if you run a bowden system.
If you can spare a little cash, get something like a TBG S or TBG Lite. They are both equivalent, just have slightly different mounting points.
Compared to the stock extruder, these are a massive improvement.
They use a tiny NEMA 14 motor, which weighs much less than a NEMA 17 that is used by the stock extruder. This does allow using it in Direct Drive configuration without adding a lot of weight to your print head.
To have the same (or actually more) power than the stock extruder, they use a ~11:1 gear reduction. They use dual gear drive, meaning that both gears that contact the filament also push it. And lastly, they use really large filament drive gears, which means that it's got a much larger contact area on the filament.
With a TBG Lite I can extrude really soft, flexible TPU with about the same quality and speed that I was able to extrude PLA before. The amount of control is incredible.
And btw, when you swap equipment related to the extruder, you need to do an e-step tuning afterwards. Google what that is.