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Recent Topics

Filament Guide for CoreXY with Direct Drive Extruder?

by DarkTerritory

Hi Folks

Working on a CoreXY printer using a lot of the design of the BLV mgn. However, I'm going to use a Toranado direct drive extruder instead of a bowden setup.

This then bags the question, how to get the filament from the spool to the extruder without causing a mess? I was thinking about using a bowden tube as a guide, fixed vertically to the top frame and long enough to reach the far corners of the opposite side of the frame. The far end of the tube would 'float' on top of the Toranado, not directly fixed. My thought is that having the distance between the extruder and the fixed point of the bowden tube on the frame would keep the filament from unspooling and getting tangled.

But I'm wondering if the drag from the tube would interfere with the feed on the Toranado. It's a geared extruder so stronger than just a pinch wheel on a hobbed gear, but not a lot. Obviously I can try it out when everything is built, and I will, but as I'm still building at this point (most of the frame is together) I'm hoping the collective wisdom here may help me decide if this is a viable option.

I'm also open to other ideas, including ones that may not involve a bowden tube. Thanks for any opinions and ideas you might share.


corexy filament_guide
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Extruder Problems

by 3DPDude

Hi Guys!

I finished my big corexy build. I have had several problems with my extruder. The latest one is a little weird. The motor will be turning fine and filament will be flowing perfectly...then randomly (like during infill or something) it will stop turning, then start again. Any ideas on how to fix this?

Thanks in advance!

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When X moves +200mm, Y moves +1 (and vice versa)

by 3DPDude

I am building a corexy. I am now almost done, but I have a bit of a problem.

Obviously, my problem is due to one motor moving faster than it should...but I don't know how to change the speed of just one motor in a corexy configuration. I am running it off of a Rumba board, and an external 4 axis TB6560 driver. I have tried changing the steps per unit in firmware, changing the dip switches in the driver for different micro stepping, and switching the motors. The mechanics is working correctly, because when I manually turn the motors, it has no shift with the other axis. Somehow, I have to change the speed of one and only one motor.

Thanks in advance!!!!

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Flashing Firmware

by 3DPDude

Hi Everyone!

Right now, I am scratch building an enormous (1m x 1m x .75m) corexy 3D Printer. The frame is basically done, so the next step is programming the motherboard. Is there an Arduino sketch that I can download and tweak to fit my printer. I am using a RUMBA board. I am new to the scratch building process. I need as much advice as I can get.

Thanks in advance!

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Cable chain guides, good or bad ?

by landie

Moving from a Prusa i3 and building a CoreXY one of the things I really wanted to improve on over the Prusa is the cable management side of things. While having the cable strung in a bit of coil wrap has been pretty reliable it looks a bit of a mess and I'd like to fix that.

My "ideal" was to use cable chain guides as that's the industrial solution to the problem and would certainly be a much neater solution but I've been told that using these guides is actually worse for the cables than just stringing them loosely to the X carriage. I've mocked up a very neat looking solution which uses a guide from the carriage to the Y end block and another from the Y end block to the frame.

Has anyone got any "real life" experience of using these guides and the longevity of the cables ?

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