Moving Gantry CoreXY Printer Inspired by the Voron II (and Railcore II), I've designed a moving gantry CoreXY 3D printer. I'm using my own custom carriages that ride on the 2020 extrusions. The gantry is supported by three vertical rails, with adjustment to keep the gantry in plane on two of the three rails. Initially it will be powered by one Z motor for simplicity. The end goal is a Railcore II type three Z motor auto bed (or gantry in this case) leveling. The reasoning for a moving gantry vs. bed is this is intended to be scalable to larger units (i.e. 1 meter plus X or Y), where the bed starts to get heavy. More detail can be found here: www.exoslide.com/blog/moving-gantry-3D-printer-design I'll post the CAD files and DXF file for the sheet-metal to the above site once I build one to see if it works! 1.jpg mod_embed_images_loadimage('be837685e880240dff619f955034ba59', '/forum/thumbcache/2b9/3e2/1df/420/ebe/658/c2d/a20/22c/7c7/3e_800x400.png', 'https://www.exoslide.com/uploads/3/1.jpg', 'https://reprap.org/forum/addon.php?397,module=embed_images,check_scaling=1,url=https%3A%2F%2Fwww.exoslide.com%2Fuploads%2F3%2F1.jpg', '', 847377, 800, 400, 'Loading image ...', false); https://reprap.org/forum/read.php?397,847377,847377#msg-847377 Mon, 14 Sep 2026 11:26:36 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?397,847377,878430#msg-878430 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,878430#msg-878430
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adamfilip
This looks very similar to my Machine I call TitanXY that I made 3 years ago
check this out

[openbuilds.com]

[attachment 112767 titan2.PNG]
[attachment 112768 titan1.PNG]

Hey there! Do you have a cad model of your current setup with linear rails? Followed your Youtube videos :) Also, did you mount the gantry in a flexible way?]]> L3LK3K CoreXY Machines Fri, 30 Oct 2020 09:33:01 -0400 https://reprap.org/forum/read.php?397,847377,868345#msg-868345 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,868345#msg-868345 Space Tec CoreXY Machines Mon, 02 Mar 2020 04:25:18 -0500 https://reprap.org/forum/read.php?397,847377,868344#msg-868344 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,868344#msg-868344 Space Tec CoreXY Machines Mon, 02 Mar 2020 04:13:38 -0500 https://reprap.org/forum/read.php?397,847377,859827#msg-859827 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,859827#msg-859827 check this out

[openbuilds.com]

[attachment 112767 titan2.PNG]
[attachment 112768 titan1.PNG]]]> adamfilip CoreXY Machines Tue, 24 Sep 2019 15:34:22 -0400 https://reprap.org/forum/read.php?397,847377,857345#msg-857345 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857345#msg-857345
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MKSA
@gmedlicott

Can you detail why you now use 4 leadscrews driven by two steppers ?

With four lead screws, the flexible gantry plane is now fully defined. The original plan to keep it simple was to have only one Z motor, with three of the four lead screws having dovetail screw adjusters to level the gantry plane.

The latest design has two Z motors, as with only one motor it exceeded the driver current. In this arrangement, once the opposing rails (the rails attached to the lead screws) are parallel, it acts as a two rod setup much like a Prusa MK3. Two motors also keeps it simple with regards to the control board, as any 5 driver board can be used. Once level, which is easily done by the dovetail adjusters, it works quite well. The only downside is the two motor positions can get out of sync when the machine if off. There are lots of software solutions for this.

A future option as noted above is to have three or four Z motors with auto gantry leveling. This is more expensive from a control board standpoint.]]> gmedlicott CoreXY Machines Wed, 31 Jul 2019 13:47:05 -0400 https://reprap.org/forum/read.php?397,847377,857259#msg-857259 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857259#msg-857259
Can you detail why you now use 4 leadscrews driven by two steppers ?]]> MKSA CoreXY Machines Tue, 30 Jul 2019 02:41:47 -0400 https://reprap.org/forum/read.php?397,847377,857258#msg-857258 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857258#msg-857258
This rule isn't only violated on CoreXY printers, may popular printers have this issue as well, resulting in varying degrees of error in the motion (requested vs actual) due to the belt being the hypotenuse, e.g. Ender 5 X & Y.]]> gmedlicott CoreXY Machines Tue, 30 Jul 2019 01:42:43 -0400 https://reprap.org/forum/read.php?397,847377,857254#msg-857254 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857254#msg-857254
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the_digital_dentist

I don't think I've ever seen anyone position a lead screw out of parallel with a guide rail, but for some reason, people seem to think it's OK to do that with belts.

If I had to guess, it's because people think belts give them license to do whatever they want since it's purposely flexible. I instinctively made my belt paths geometrically correct when designing my printer, but I didn't understand why when I initially did so. It just 'made sense' to me back then.]]> obelisk79 CoreXY Machines Tue, 30 Jul 2019 00:27:46 -0400 https://reprap.org/forum/read.php?397,847377,857210#msg-857210 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857210#msg-857210
I don't think I've ever seen anyone position a lead screw out of parallel with a guide rail, but for some reason, people seem to think it's OK to do that with belts.]]> the_digital_dentist CoreXY Machines Mon, 29 Jul 2019 08:49:39 -0400 https://reprap.org/forum/read.php?397,847377,857203#msg-857203 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857203#msg-857203
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the_digital_dentist

Hey, thanks! I've added this one to my collection of bad corexy builds.

That is quite the wall of shame]]> obelisk79 CoreXY Machines Mon, 29 Jul 2019 07:28:22 -0400 https://reprap.org/forum/read.php?397,847377,857020#msg-857020 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857020#msg-857020
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dc42
Yes there is an off-the-shelf daughter board for the Duet Maestro, [www.duet3d.com].

Excellent! How did I miss that. Cheers!]]> gmedlicott CoreXY Machines Thu, 25 Jul 2019 01:51:05 -0400 https://reprap.org/forum/read.php?397,847377,857018#msg-857018 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857018#msg-857018 www.duet3d.com].]]> dc42 CoreXY Machines Thu, 25 Jul 2019 01:28:29 -0400 https://reprap.org/forum/read.php?397,847377,857017#msg-857017 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,857017#msg-857017
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dc42
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gmedlicott
Right now its running on Marlin 1.1.9 on a board with 5 drivers. I would like to move a board with 6 drivers (or ideally 7) for auto gantry leveling.

Duet Maestro with daughter board provides 7 drivers (TMC2224, similar to TMC2208)
Duet WiFi or Duet Ethernet plus DueX2 provides 7 TMC2660 drivers, or 10 using DueX5 instead of DueX2.
All run RepRapFirmware which supports 2, 3 and 4 leadscrew true bed levelling as standard.

I have a Maestro lined up to try that I bought at MRRF. I'll proto a PCB to connect the stepper headers to stepsticks (TMC2208, or do I need TCM2224?), unless there is an off the shelf version of this?

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piper3d
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gmedlicott
Right now its running on Marlin 1.1.9 on a board with 5 drivers. I would like to move a board with 6 drivers (or ideally 7) for auto gantry leveling.

You want to look at Klipper. with 1 additional 8 bit board and RPI you will have 10 stepper drivers, with 1 more board 15. So you can run 4 Z motors to auto-level and several more left for tool changer and a robotic arm to remove printed parts (this is optional smiling smiley)

Not really a fan of this approach (bunch of boards), but I've heard Klipper is evolving, so maybe warrants a second look.]]> gmedlicott CoreXY Machines Wed, 24 Jul 2019 23:12:22 -0400 https://reprap.org/forum/read.php?397,847377,856975#msg-856975 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,856975#msg-856975
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gmedlicott
Right now its running on Marlin 1.1.9 on a board with 5 drivers. I would like to move a board with 6 drivers (or ideally 7) for auto gantry leveling.
You want to look at Klipper. with 1 additional 8 bit board and RPI you will have 10 stepper drivers, with 1 more board 15. So you can run 4 Z motors to auto-level and several more left for tool changer and a robotic arm to remove printed parts (this is optional :))]]> piper3d CoreXY Machines Wed, 24 Jul 2019 02:19:46 -0400 https://reprap.org/forum/read.php?397,847377,856974#msg-856974 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,856974#msg-856974
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gmedlicott
Right now its running on Marlin 1.1.9 on a board with 5 drivers. I would like to move a board with 6 drivers (or ideally 7) for auto gantry leveling.

Duet Maestro with daughter board provides 7 drivers (TMC2224, similar to TMC2208)
Duet WiFi or Duet Ethernet plus DueX2 provides 7 TMC2660 drivers, or 10 using DueX5 instead of DueX2.
All run RepRapFirmware which supports 2, 3 and 4 leadscrew true bed levelling as standard.]]> dc42 CoreXY Machines Wed, 24 Jul 2019 02:05:57 -0400 https://reprap.org/forum/read.php?397,847377,856970#msg-856970 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,856970#msg-856970


All the 3D printable part models (in blue) are found here (If anyone wants the Fusion 360 files, PM me):
https://exoslide.com/exocube-printer

Right now its running on Marlin 1.1.9 on a board with 5 drivers. I would like to move a board with 6 drivers (or ideally 7) for auto gantry leveling.



If you have any questions, ask away!
]]> gmedlicott CoreXY Machines Wed, 24 Jul 2019 01:29:51 -0400 https://reprap.org/forum/read.php?397,847377,847628#msg-847628 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847628#msg-847628
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MKSA
What makes the ExoSlide different from regular wheel carriages ? The fact they are modular and can be assembled ? How do you adjust the "play", by the two long screws one can see ?

Many differences; a proper release is coming very soon!

Lots can already be teased out from the main page photo and the last blog post. Preload adjustment is by the small m3 screws nested near each other (in the assembly).]]> gmedlicott CoreXY Machines Thu, 21 Feb 2019 16:02:54 -0500 https://reprap.org/forum/read.php?397,847377,847627#msg-847627 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847627#msg-847627
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dc42
Are you certain that your gantry will be rigid enough to need only 3 leadscrews to support it and not 4?

The Duet can level 4 leadscrews (assuming there is a little flexibility in the gantry) as well as 3.

It was sufficiently stiff (for reasonable spans) in the testing of a carriage with a cross bar.

Stiffness of the mounting scheme is one of the advantages of the slides coupled with the brackets.

If the X (or Y) span is too long, I might go with 4 Z supports.]]> gmedlicott CoreXY Machines Thu, 21 Feb 2019 15:55:49 -0500 https://reprap.org/forum/read.php?397,847377,847557#msg-847557 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847557#msg-847557
What makes the ExoSlide different from regular wheel carriages ? The fact they are modular and can be assembled ? How do you adjust the "play", by the two long screws one can see ?]]> MKSA CoreXY Machines Thu, 21 Feb 2019 02:17:56 -0500 https://reprap.org/forum/read.php?397,847377,847554#msg-847554 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847554#msg-847554
The Duet can level 4 leadscrews (assuming there is a little flexibility in the gantry) as well as 3.]]> dc42 CoreXY Machines Thu, 21 Feb 2019 01:42:02 -0500 https://reprap.org/forum/read.php?397,847377,847543#msg-847543 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847543#msg-847543
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cozmicray
EcoSlide?

What is it?
Where?
Cost?

ExoSlide, not EcoSlide (Exo like outer skeleton). Hopefully I don't have a typo somewhere!

They are modular linear slides for aluminum extrusions.

Stay tuned, I'll have product details available shortly (though not in this thread, I'll keep it CoreXY related)]]> gmedlicott CoreXY Machines Wed, 20 Feb 2019 20:13:54 -0500 https://reprap.org/forum/read.php?397,847377,847541#msg-847541 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847541#msg-847541
What is it?
Where?
Cost?

:S]]> cozmicray CoreXY Machines Wed, 20 Feb 2019 18:37:35 -0500 https://reprap.org/forum/read.php?397,847377,847513#msg-847513 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847513#msg-847513
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patnap71
Check these out...

[openbuilds.com]

[openbuilds.com]

[openbuilds.com]

Thanks for the links. All three use four Z screws to control the gantry, similar to the Voron II. On mine, the one mid-placed Z screw I use is possible because the carriage and bracket arrangement is quite stiff. But since I can't guarantee the perpendicular gantry extrusion carrying the XY motors is 100% parallel to the bed, the opposing two Z screws have adjustment on them (dovetail adjusters) to keep the gantry in plane. The bed also has one of the three mounts adjustable to keep it parallel to gantry.

The Z-adjustments and the Z belt arrangement for the single Z motor may be as difficult to get working right as three Z motors with Duet control (e.g. Railcore II). I'll build the former first, then have a go a the Duet option.]]> gmedlicott CoreXY Machines Wed, 20 Feb 2019 12:34:16 -0500 https://reprap.org/forum/read.php?397,847377,847512#msg-847512 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847512#msg-847512 Because they enjoy learning from their mistakes and want to keep learning and learning and learning .... :)
And they like to share !]]> MKSA CoreXY Machines Wed, 20 Feb 2019 11:45:31 -0500 https://reprap.org/forum/read.php?397,847377,847498#msg-847498 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847498#msg-847498
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patnap71
Check these out...

[openbuilds.com]

Hey, thanks! I've added this one to my collection of bad corexy builds.

I am amazed at how many people put so much effort and $ into making otherwise solid printers without understanding how the corexy mechanism works. One would think that people would wonder why, after building one of these abominations, the belt tensions change every time they move the extruder carriage. You'd think that would set off some alarms, but I guess not because they keep posting bad designs on the web.]]> the_digital_dentist CoreXY Machines Wed, 20 Feb 2019 09:37:30 -0500 https://reprap.org/forum/read.php?397,847377,847486#msg-847486 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847486#msg-847486
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patnap71
Check these out...

[openbuilds.com]

[openbuilds.com]

[openbuilds.com]

IMHO, the first link also has the belts wrongly set, belts that should be paralel to movement are not...]]> EgonVLC CoreXY Machines Wed, 20 Feb 2019 06:40:43 -0500 https://reprap.org/forum/read.php?397,847377,847468#msg-847468 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847468#msg-847468
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patnap71
Check these out...

[openbuilds.com]

[openbuilds.com]

[openbuilds.com]

Even more screwed. Who will dare a 5 leadscrews ? :)]]> MKSA CoreXY Machines Wed, 20 Feb 2019 03:16:14 -0500 https://reprap.org/forum/read.php?397,847377,847461#msg-847461 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847461#msg-847461
[openbuilds.com]

[openbuilds.com]

[openbuilds.com]]]> patnap71 CoreXY Machines Wed, 20 Feb 2019 01:23:28 -0500 https://reprap.org/forum/read.php?397,847377,847404#msg-847404 Re: Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847404#msg-847404 MKSA CoreXY Machines Tue, 19 Feb 2019 07:51:26 -0500 https://reprap.org/forum/read.php?397,847377,847377#msg-847377 Moving Gantry CoreXY Printer https://reprap.org/forum/read.php?397,847377,847377#msg-847377
The gantry is supported by three vertical rails, with adjustment to keep the gantry in plane on two of the three rails. Initially it will be powered by one Z motor for simplicity. The end goal is a Railcore II type three Z motor auto bed (or gantry in this case) leveling.

The reasoning for a moving gantry vs. bed is this is intended to be scalable to larger units (i.e. 1 meter plus X or Y), where the bed starts to get heavy.

More detail can be found here:
www.exoslide.com/blog/moving-gantry-3D-printer-design

I'll post the CAD files and DXF file for the sheet-metal to the above site once I build one to see if it works!


]]> gmedlicott CoreXY Machines Mon, 18 Feb 2019 18:40:48 -0500