1 Topic by accusedmonk

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Topic: Core XY Large Format Printer

I've hinted here and there that I've been planning a large format build.   I'm going with the Core XY design, which keeps all the motors stationary.  I'm sourcing lots of the structural parts from openbuilds, their v slot will allow me to use the frame itself as linear guides.

Recently i started modeling up the design in fusion 360, which is a wonderfully powerful tool that i highly recommend.  This is another reason i like open builds is that almost all of their products are already uploaded for CAD work, so you can spend time with the design and not making these parts from scratch.

I'll be posting here as the design progresses.  In another day or two i will have the first pictures of the frame with the x and y axis draw up.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

2 Reply by accusedmonk

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Re: Core XY Large Format Printer

For the x axis, i was planning on using the 20x20mm vslot extrusion.  With such a large span, do you guys think it would hold up without flexing in any direction? 

I was going that size to keep weight down, but if anyone who has used something similar knows for sure i would be very grateful!  To be on the safe side I'll probably change to the 20x40mm anyway.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

3 Reply by elmoret

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Re: Core XY Large Format Printer

1.) You haven't quantified "a large span".
2.) There's no reason to guess. You can calculate it yourself from the moment of inertia, or use an online calculator if you are particularly unmotivated.

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4 Reply by accusedmonk

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Re: Core XY Large Format Printer

Ah i did leave out the length for some reason, i didn't even realize it!  It will span about 500mm.  I will check on calculating it.

Now that i won't be at work so much like the past weeks I'll finish the CAD work hopefully this week so you guys can see what i have in mind.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

5 Reply by accusedmonk

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Re: Core XY Large Format Printer

I will get almost 1mm of flex with about 5 lbs on 20x20mm extrusion.  With 20x40mm its only ~0.15mm, which is definitely ok.  My printable area with be about 400mm cubed.  I'll get precise numbers when the design is finished.

I'm going to be printing the carriages, I drew those up for the Y axis so far.  Braided line will run through the middle of the carriage to go to the other side.  The line will cross over in the front for the Core XY style.

Here is my initial drawing, all it is at the moment is the framework, and Y Axis Carriage.  I still have to draw in the wheels to check clearances and line everything up.
http://i.imgur.com/QETU4wA.png

http://i.imgur.com/yPdgMSz.png

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

6 Reply by shields1.as

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Re: Core XY Large Format Printer

That's so awesome.

accusedmonk wrote:

I will get almost 1mm of flex with about 5 lbs on 20x20mm extrusion.  With 20x40mm its only ~0.15mm, which is definitely ok.  My printable area with be about 400mm cubed.  I'll get precise numbers when the design is finished.

I'm going to be printing the carriages, I drew those up for the Y axis so far.  Braided line will run through the middle of the carriage to go to the other side.  The line will cross over in the front for the Core XY style.

Here is my initial drawing, all it is at the moment is the framework, and Y Axis Carriage.  I still have to draw in the wheels to check clearances and line everything up.
http://i.imgur.com/QETU4wA.png

http://i.imgur.com/yPdgMSz.png

7 Reply by Superdave

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Re: Core XY Large Format Printer

Nice work on the modeling.

If you build it they will come. Then they will make fun of it, tell you it's not worth doing and go home and try to copy you.
If a picture is worth a thousand words then being there is worth a thousand pictures.

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8 Reply by accusedmonk

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Re: Core XY Large Format Printer

Don't give me too much credit, i got the steppers and the extrusion from the resources off openbuilds.  But I'm glad they are there, it saves quite a bit of time just being able to import and align a few things.

Either way, thanks for the kind words!

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

9 Reply by toobyaas

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Re: Core XY Large Format Printer

I would say that 20x20 extrusion won't flex 1mm with 5lbs weight on it.. It's really stiff material!

Are you going to use plastic or metal wheels on this? Because if you have coated extrusion, metal wheels wear out the coating pretty fast. Especially if rails have some misalignment. Plastic wheels instead gives pretty much flexing to whole thing!

Nice desing though! If you are interested, you can check my build with opebuilds also: http://www.soliforum.com/topic/7531/diy … -2/page/4/

10 Reply by accusedmonk

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Re: Core XY Large Format Printer

Well the calculations came out to about 0.9 mm for 5 lbs on a 500mm of 20x20mm extrusion.  The 20x40mm was only a 0.15 mm flex.  I highly doubt I'll see those forces printing.  I'll crunch some numbers to see what it would generate at speed.

I was going to use their delrin solid v wheels, although I'm still debating on using the extreme wheels.  With how light everything is going to be though i don't see the regular wheels causing any problems.

I've been following your work as well!  Beautifully done machining and designs!  I would love to go that route myself but no access to the equipment yet.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

11 Reply by accusedmonk

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Re: Core XY Large Format Printer

I've had unfortunate changes at home and haven't been on here at all.  All projects have been stagnant, but I've finally started getting things set back up in my new home.  I'm coming back to this currently with a drastic change.

Instead of another FDM I'm going modify this current design to utilize a 1080P DLP projector and print with photo curable resin.  It much exceeds my demands and will be even simpler to operate, not to mention faster.

After I get the DLP printer going I will finish the Core XY large printer as before, mainly because a multi-head printer is necessary to me solely for the dissolvable supports.  I will create a new thread for the DLP printer when I make progress.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

12 Reply by wardjr

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Re: Core XY Large Format Printer

accusedmonk wrote:

I've had unfortunate changes at home and haven't been on here at all.  All projects have been stagnant, but I've finally started getting things set back up in my new home.  I'm coming back to this currently with a drastic change.

Instead of another FDM I'm going modify this current design to utilize a 1080P DLP projector and print with photo curable resin.  It much exceeds my demands and will be even simpler to operate, not to mention faster.

After I get the DLP printer going I will finish the Core XY large printer as before, mainly because a multi-head printer is necessary to me solely for the dissolvable supports.  I will create a new thread for the DLP printer when I make progress.


Sorry to here that but good to have you back.  I look forward to seeing your progress in the DLP area.

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