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koshu

GeBO-Quick - Geared Bowden Extruder with Quick-Release

by koshu Mar 4, 2018
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really cool work .. i am building a printer for my kid and wanted a small geared extruder that could be reloaded even by a kid. i loved this idea , i am going to adopt it to make a compact nema 14 1:2 geared extruder.

https://www.instagram.com/p/BwViSp_BKw3/

https://www.instagram.com/p/BvQI84bn87u/

Nice idea. The pictures are your progress of the printer? Cute size, looks neat. Why did you use a parallel kinematic for the x-axis? Is it in comparison more compact?

When easy of use is the main goal and depending on how closely you planned stick to this design I would suggest one redesign. Having used this extruder for quite some time now one part can be a little bit tricky when loading the filament:

https://i.imgur.com/PVL1CK1.jpg

It is sometimes a little bit hard to get the filament inside this guide (not incredibly hard but maybe a little bit frustrating for a kid). I would suggest to either extend this part so that it is even closer to the drive gear or adding some kind of funnel (or both if possible). Didn't have time to redesign it for my extruder yet.

Another idea that just came to my mind is the use of a filament senor. The prusa mk3 we got at work do this and I found it to be very fast and easy. As soon as it detects filament being pushed in it just uses the motor to pull it in. However, that approach probably means some fiddling around with the software to get it to work with an bowden extruder (as well as the additional hardware). So if software is your thing that might be another solution.

Good luck with your printer!

yes it is progress . and does print. i wanted to try the deltesian kinematics just out of curosity. the only advantage over a cartesian is the uses of less motors and no lead screw. ( 3 motors ) and the advantage over a delta is the removal of ball socket joint making it easy to calibarate and has much simpler joints.

https://www.instagram.com/p/BvsDys_H457/

https://www.instagram.com/p/BvX9pxRHOgg/

yes i was going to make funnels on both ends as it frustrating to load filament with a straight joint. also i was looking at the filament sensor in prusa but it is out of my knowledge set to fix software for it. I am using a serial touch lcd to control the printer so maybe i can do it in gcode with a simple load and unload macro.

Just downloaded, very nice project, I'm planning to include in my new printer. Could you share the files in some cad format? this would help me to integrate the extruder in the new printer. ;)

Sure, which format do you need? Is step fine?

Great!
I use Inventor but step is ok!

Here you go. Added it to the project as zip-file. Hopefully, I didn't miss something. If it doesn't work or you need anything else let me know.

thanks a lot, I will let you know as soon as I make the extruder

Just to say I loved your design and I will make it as soon as needed :D

Thanks :), good luck with the build, I hope you will like it. If you have the time I would like some feedback on the design.

Also, if you want to make modifications and need other filetypes then let me know.