Which core XY should I build? I like the idea of the core XY but am confused by the variety of designs out there. I am thinking of a 200 x 300 mm bed with a stable diamond hotend with 3 bowden extruders for colour mixing. I will only be printing PLA but need to keep the overall design size as small as possible in the X and Y direction. The x carriage should be strong and stable enough to handle the diamond hotend. I will be using duet electronics with a dueX4 add on board. I will need to do some modifications to support 3 extruders and 3 reels of filament. So my question-----which completed and proven design would best fit my aims? Thanks for any advice. https://reprap.org/forum/read.php?397,648144,648144#msg-648144 Tue, 09 Jun 2026 14:30:12 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?397,648144,650061#msg-650061 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,650061#msg-650061 the_digital_dentist CoreXY Machines Fri, 08 Apr 2016 22:10:18 -0400 https://reprap.org/forum/read.php?397,648144,650037#msg-650037 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,650037#msg-650037
Quote
the_digital_dentist
It will meet all the basic requirements for a quality printer and look a lot my current machine:

Rock solid 40mm square t slot aluminum frame
electronics in a drawer?
fully enclosed
linear guides for all linear motion
32 bit controller
DSP drivers on X and Y axes
no autotramming
high voltage supplies for motors
minimal/no printed parts- all metal

and
XY assembly on a flat steel plate (?)
bed lifted by 3 screws and 1 motor
heated bed?

print envelope: 300 x 300 x 600+ (?)

As always, print quality will be highest priority. I will control costs by using used parts wherever practical (I already have 3x Japanese linear guides from ebay and all frame parts from a scrap yard) and doing all required machining myself.

I really appreciate your last build and write-up you made on instructables.
But after I built my corexy I have a question. Are you building your corexy for speed or for precision and accuracy while printing at around 50mm/s like your last printer?
It seems that just like your last printer your corexy will not be a lightweight. This means that you could put an X axis motor on the Y-axis bearing and make your moving mass just 400 grams higher (if you use nema17). This seems more reasonable to me than building a heavyweight corexy. Unless of course you are building just because you like corexy architecture which sounds like a good enough reason to me.]]> Edvardas CoreXY Machines Fri, 08 Apr 2016 19:02:19 -0400 https://reprap.org/forum/read.php?397,648144,649966#msg-649966 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649966#msg-649966 and how rails are mounted to plate

Nice on a flat formica counter top
but twisty curvey mounted atop a 3D printer
a proper tubing frame mo better

Quote
realthor
Quote
the_digital_dentist
XY assembly on a flat steel plate (?)

This means that it will be doable only by guys with access to a machining shop to cut the plate for them right? You are talking something like this: [youtu.be] ...

:S]]> cozmicray CoreXY Machines Fri, 08 Apr 2016 15:55:19 -0400 https://reprap.org/forum/read.php?397,648144,649945#msg-649945 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649945#msg-649945
1) You can print things that require precise fit, such as gears, threaded parts, etc., that you might not be able to print successfully on a machine that is not so well built.

2) A higher quality machine is generally more trouble free than a crappy one. There's less adjusting, repairing, and modifying to do, and it prints more reliably. That translates into less wasted time which is the best return on your investment that you can hope for (unless you don't value your time).

3) The feeling of accomplishment that comes from making something truly awesome as opposed to making something run of the mill has value.

4) Education- there's a lot to be said for working on a design that's better. You have to really think about fundamental concepts like quality and reliability and how to translate them into hardware. Lessons learned are applicable to other endeavors.]]> the_digital_dentist CoreXY Machines Fri, 08 Apr 2016 15:01:58 -0400 https://reprap.org/forum/read.php?397,648144,649877#msg-649877 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649877#msg-649877
Quote
the_digital_dentist
Quality costs.

As expected... but most people don't get out of the 3D printers something that is worth that quality in parts. That's why most buy $300 printers/kits.]]> realthor CoreXY Machines Fri, 08 Apr 2016 12:29:51 -0400 https://reprap.org/forum/read.php?397,648144,649876#msg-649876 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649876#msg-649876 the_digital_dentist CoreXY Machines Fri, 08 Apr 2016 12:27:37 -0400 https://reprap.org/forum/read.php?397,648144,649861#msg-649861 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649861#msg-649861
Quote
the_digital_dentist
If I use a piece of cast aluminum tooling plate for the XY mechanism base, the hole cut in the center of the plate may become the print bed plate and other parts, so material use will be relatively efficient. I can deal with the thermal expansion of the plate by adding a second bearing block to the X axis guide rail.

I thought about that too but that alone will be around $100 easily.]]> realthor CoreXY Machines Fri, 08 Apr 2016 12:01:19 -0400 https://reprap.org/forum/read.php?397,648144,649785#msg-649785 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649785#msg-649785
I'm building one machine for my own use, and not planning on going into mass production. The priority is on print quality, not absolute minimal cost (though cost IS always a factor) or ease of construction beyond tools available to me. If I run into something that's too hard for me to do or too expensive for me to have done, I'll look for alternatives, but I'll try not to compromise the print quality to make the thing buildable for $300. I'll probably spend >$300 on the extruder/hot end/controller board alone.

If I use a piece of cast aluminum tooling plate for the XY mechanism base, the hole cut in the center of the plate may become the print bed plate and other parts, so material use will be relatively efficient. I can deal with the thermal expansion of the plate by adding a second bearing block to the X axis guide rail.]]> the_digital_dentist CoreXY Machines Fri, 08 Apr 2016 08:35:31 -0400 https://reprap.org/forum/read.php?397,648144,649755#msg-649755 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649755#msg-649755
Quote
the_digital_dentist
XY assembly on a flat steel plate (?)

This means that it will be doable only by guys with access to a machining shop to cut the plate for them right? You are talking something like this: [youtu.be] ...]]> realthor CoreXY Machines Fri, 08 Apr 2016 06:55:45 -0400 https://reprap.org/forum/read.php?397,648144,649585#msg-649585 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649585#msg-649585
Quote
cozmicray
How about a belt drive Z axis?

Something like this using one motor

[attachment 76055 Belt_Z.jpg]

Have to look at belt forces and whatnot to balance out
pull and tug?

Cheaper than leadscrews?
May have higher resolution?

:S

Build the prototype and show us if it works well! :)]]> vpt5566 CoreXY Machines Thu, 07 Apr 2016 16:23:29 -0400 https://reprap.org/forum/read.php?397,648144,649579#msg-649579 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649579#msg-649579
Quote
appjaws1
Thanks for all the replies, I have decided to build a D-bot and am in the process of ordering parts.

Let us know how it goes, I'm curious for this printer how easy it is to get all of the different parts vs buying one kit]]> vpt5566 CoreXY Machines Thu, 07 Apr 2016 16:11:30 -0400 https://reprap.org/forum/read.php?397,648144,649140#msg-649140 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649140#msg-649140
Something like this using one motor

[attachment 76055 Belt_Z.jpg]

Have to look at belt forces and whatnot to balance out
pull and tug?

Cheaper than leadscrews?
May have higher resolution?

:S]]> cozmicray CoreXY Machines Wed, 06 Apr 2016 13:44:48 -0400 https://reprap.org/forum/read.php?397,648144,649090#msg-649090 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649090#msg-649090 appjaws1 CoreXY Machines Wed, 06 Apr 2016 11:50:39 -0400 https://reprap.org/forum/read.php?397,648144,649048#msg-649048 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,649048#msg-649048
[openbuilds.org]

All three printers share the basic concept of using 20x40 v-slot for structure and wheel + carriage on v-slot for motion components, and it's pretty easy to scale the design.]]> grat CoreXY Machines Wed, 06 Apr 2016 10:30:52 -0400 https://reprap.org/forum/read.php?397,648144,648970#msg-648970 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648970#msg-648970 the_digital_dentist CoreXY Machines Wed, 06 Apr 2016 06:53:15 -0400 https://reprap.org/forum/read.php?397,648144,648894#msg-648894 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648894#msg-648894 realthor CoreXY Machines Wed, 06 Apr 2016 01:51:22 -0400 https://reprap.org/forum/read.php?397,648144,648692#msg-648692 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648692#msg-648692
Rock solid 40mm square t slot aluminum frame
electronics in a drawer?
fully enclosed
linear guides for all linear motion
32 bit controller
DSP drivers on X and Y axes
no autotramming
high voltage supplies for motors
minimal/no printed parts- all metal

and
XY assembly on a flat steel plate (?)
bed lifted by 3 screws and 1 motor
heated bed?

print envelope: 300 x 300 x 600+ (?)

As always, print quality will be highest priority. I will control costs by using used parts wherever practical (I already have 3x Japanese linear guides from ebay and all frame parts from a scrap yard) and doing all required machining myself.]]> the_digital_dentist CoreXY Machines Tue, 05 Apr 2016 13:40:05 -0400 https://reprap.org/forum/read.php?397,648144,648658#msg-648658 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648658#msg-648658
Quote
the_digital_dentist
I'm working on it...

I'm very curious what is that going to look like.]]> realthor CoreXY Machines Tue, 05 Apr 2016 12:08:54 -0400 https://reprap.org/forum/read.php?397,648144,648632#msg-648632 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648632#msg-648632 www.thingiverse.com]
It seems pretty popular and I think you could remix it to take a different hot end]]> vpt5566 CoreXY Machines Tue, 05 Apr 2016 11:17:10 -0400 https://reprap.org/forum/read.php?397,648144,648424#msg-648424 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648424#msg-648424
Quote
cozmicray
If the Digital Dentist comes out with a design that would be great.

:S

I'm working on it...]]> the_digital_dentist CoreXY Machines Mon, 04 Apr 2016 23:43:30 -0400 https://reprap.org/forum/read.php?397,648144,648348#msg-648348 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648348#msg-648348
Z-axis is where you should put your attention at.]]> Edvardas CoreXY Machines Mon, 04 Apr 2016 17:26:48 -0400 https://reprap.org/forum/read.php?397,648144,648333#msg-648333 Re: Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648333#msg-648333
Go with Guide rails
They can be had on eBay inexpensively

If the Digital Dentist comes out with a design that would be great.

Rectangled has a nice design in
[forums.reprap.org]

Would be nice to have a good design / kit
so a bunch of people have the same design to beat on!

:S]]> cozmicray CoreXY Machines Mon, 04 Apr 2016 16:51:41 -0400 https://reprap.org/forum/read.php?397,648144,648144#msg-648144 Which core XY should I build? https://reprap.org/forum/read.php?397,648144,648144#msg-648144 I am thinking of a 200 x 300 mm bed with a stable diamond hotend with 3 bowden extruders for colour mixing.
I will only be printing PLA but need to keep the overall design size as small as possible in the X and Y direction.
The x carriage should be strong and stable enough to handle the diamond hotend.
I will be using duet electronics with a dueX4 add on board.

I will need to do some modifications to support 3 extruders and 3 reels of filament.

So my question-----which completed and proven design would best fit my aims?

Thanks for any advice.]]> appjaws1 CoreXY Machines Mon, 04 Apr 2016 09:49:18 -0400