My coreXY design is progressing to the build stage I have just about finished the XY stage design and will be building it shortly. I'll be using 22 mm diameter F608ZZ bearings for the idlers, and designed a self-locking belt clamp for the extruder carriage. The belt clamp has to keep the belt(s) parallel to the X axis throughout the range of motion, so I laid out the clamp to do just that. The small holes in the top indicate the where the smooth side of the belt enters the clamp. There will be two of these clamps stacked on top of each other, one for each belt. [img]http://mark.rehorst.com/misc/corexy/ECBC.png[/img] I printed it and checked the fit- perfect! GT2 belt is 1.38 mm thick. When you interdigitate the teeth by folding the belt, the thickness becomes 2.2 mm. The clamp has 2.2 mm slots that don't allow the belt teeth any room to slide over each other. The blocks will be glued together and the holes in the posts will be used to mount them on the extruder carriage. The belt tension will be trying to make the block twist, but the other block will twist the other direction. Once the two blocks are glued together, the equal and opposite torques will cancel and twisting force will be minimal. [img]http://mark.rehorst.com/misc/corexy/ECBC.jpg[/img] https://reprap.org/forum/read.php?397,659980,659980#msg-659980 Sat, 13 Jun 2026 17:36:47 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?397,659980,833930#msg-833930 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,833930#msg-833930
I see a lot of designs for extruder carriages that look really pretty and very professional compared to mine, but if I need to get at something to fix it, it's all right there and easy to work on. I do a lot of experimenting with extruders, hot-ends, and cooling fans, so it's easy to fit different parts on the extruder carriage.

If I put a few hours of work into it I can probably shorten the length of that extension by 20 or 30 mm, but it's performing quite well and I'm not currently inclined to attack it. There are other projects I want to work on like this]]> the_digital_dentist CoreXY Machines Mon, 17 Sep 2018 21:55:40 -0400 https://reprap.org/forum/read.php?397,659980,833926#msg-833926 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,833926#msg-833926 gmedlicott CoreXY Machines Mon, 17 Sep 2018 20:29:15 -0400 https://reprap.org/forum/read.php?397,659980,832205#msg-832205 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,832205#msg-832205 hayseed_byte CoreXY Machines Mon, 27 Aug 2018 17:27:11 -0400 https://reprap.org/forum/read.php?397,659980,832167#msg-832167 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,832167#msg-832167 Qdeathstar CoreXY Machines Mon, 27 Aug 2018 10:32:41 -0400 https://reprap.org/forum/read.php?397,659980,832124#msg-832124 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,832124#msg-832124 hayseed_byte CoreXY Machines Mon, 27 Aug 2018 03:24:32 -0400 https://reprap.org/forum/read.php?397,659980,831883#msg-831883 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,831883#msg-831883
I wrote a blog post specifically on corexy layout that I think will prevent a lot of errors if people actually see it before they start building their printers. Maybe I should start a separate thread here and just put the same stuff in a post or two, since people are more likely to see it here than on my blog.

UMMD, the big sand table, and me will be at the Milwaukee MakerFaire on the last weekend of September. This will be the 5th year, and we typically get 30-40k people, so it's a pretty big deal. If you come, stop by the Milwaukee Makerspace booth and say hello. I might even let you buy me a beer...]]> the_digital_dentist CoreXY Machines Thu, 23 Aug 2018 23:33:38 -0400 https://reprap.org/forum/read.php?397,659980,831828#msg-831828 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,831828#msg-831828
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hayseed_byte
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piper3d
the_digital_dentist, you have some epic job documented in this thread. Multiple innovative solutions. People may read it as a book on how to design your own printer. Congratulations on a great job!

I basically used this thread along with his blog as an instruction book while I was designing and building my modified d-bot. I really do feel like a book would be a good idea. Having all the information and design methodology(?) from this thread organized in a more readable way would be epic. Mr. Rehorst does such a good job explaining engineering principles that even a flunkie chicken-plant mechanic like me was able to understand and implement them. Seriously, dd, write a book. :D It's super easy with Amazon self-publishing. If nothing else, monetize your blog. I feel like I should compensate you somehow for all the ideas I stole from you while I was building my printer.

+1 from a long time lurker of this thread.]]> widespreaddeadhead CoreXY Machines Thu, 23 Aug 2018 10:22:17 -0400 https://reprap.org/forum/read.php?397,659980,831733#msg-831733 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,831733#msg-831733
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piper3d
the_digital_dentist, you have some epic job documented in this thread. Multiple innovative solutions. People may read it as a book on how to design your own printer. Congratulations on a great job!

I basically used this thread along with his blog as an instruction book while I was designing and building my modified d-bot. I really do feel like a book would be a good idea. Having all the information and design methodology(?) from this thread organized in a more readable way would be epic. Mr. Rehorst does such a good job explaining engineering principles that even a flunkie chicken-plant mechanic like me was able to understand and implement them. Seriously, dd, write a book. :D It's super easy with Amazon self-publishing. If nothing else, monetize your blog. I feel like I should compensate you somehow for all the ideas I stole from you while I was building my printer.]]> hayseed_byte CoreXY Machines Wed, 22 Aug 2018 04:24:19 -0400 https://reprap.org/forum/read.php?397,659980,831394#msg-831394 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,831394#msg-831394 Qdeathstar CoreXY Machines Thu, 16 Aug 2018 20:31:38 -0400 https://reprap.org/forum/read.php?397,659980,831338#msg-831338 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,831338#msg-831338


I'll be modifying it a little, but expect this to be the more-or-less final form for the extruder carriage.

I found some problems with the Aluminum Titan extruder when I took it apart so I could mount it on the new carriage. The lever for the pinch roller fits over the motor shaft just like the plastic part that E3D uses. The steel shaft of the motor was chewing up the aluminum and the inside of the extruder had a lot of fine black dust from it. Maybe that part needs a bronze bushing. Also, the seal on the pinch roller bearing came out of the bearing and was preventing it from turning properly.
]]> the_digital_dentist CoreXY Machines Thu, 16 Aug 2018 01:08:50 -0400 https://reprap.org/forum/read.php?397,659980,830971#msg-830971 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,830971#msg-830971
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piper3d
the_digital_dentist, you have some epic job documented in this thread. Multiple innovative solutions. People may read it as a book on how to design your own printer. Congratulations on a great job!

Thanks, it has been a long road...

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JoergS5
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the_digital_dentist
XCR3D (also Chinese made) hot-end

I was looking at the XCR3D, in the german ebay is a comment that the cartridge heater is ok for 350 °C, but the hotend shall be used only up to 240 °C, a high temperature version will be available in the future.

Seems to be the same version like on alixepress, as he advertises using a german imported cnc machine in both offers. Just wanted to let you know to be careful with the temperature.

I'm not sure what would limit the upper temperature except that it came with a thermistor to sense the temperature. The heatbreak is SS, and the teflon liner stops well above the narrow part of the heat break. The heater cartridge has glass/silicone insulation on the leads, though I suppose it may have a problem at very high temperatures. I have installed an E3D PT100 sensor that should be good to 350C or so. So far I mostly print ABS and it has been fine. I am planning to try some PC in the near future.]]> the_digital_dentist CoreXY Machines Sat, 11 Aug 2018 21:41:06 -0400 https://reprap.org/forum/read.php?397,659980,830968#msg-830968 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,830968#msg-830968
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the_digital_dentist
XCR3D (also Chinese made) hot-end

I was looking at the XCR3D, in the german ebay is a comment that the cartridge heater is ok for 350 °C, but the hotend shall be used only up to 240 °C, a high temperature version will be available in the future.

Seems to be the same version like on alixepress, as he advertises using a german imported cnc machine in both offers. Just wanted to let you know to be careful with the temperature.]]> JoergS5 CoreXY Machines Sat, 11 Aug 2018 18:36:52 -0400 https://reprap.org/forum/read.php?397,659980,830887#msg-830887 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,830887#msg-830887 piper3d CoreXY Machines Fri, 10 Aug 2018 19:00:57 -0400 https://reprap.org/forum/read.php?397,659980,829315#msg-829315 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,829315#msg-829315 Milwaukee Maker Faire (the largest free Maker Faire in the free world) coming up on Sept 28-30th in Milwaukee at State Fair Park, and needed a photo of UMMD for promo purposes, so I dragged him out of the dungeon and took a couple pictures. This is what the whole thing looks like with the Duet, Panel Due, and new electronics enclosure:



Yeah, I know... how does blue filament turn into fluorescent pink???
]]> the_digital_dentist CoreXY Machines Sun, 22 Jul 2018 22:43:11 -0400 https://reprap.org/forum/read.php?397,659980,829221#msg-829221 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,829221#msg-829221 chance of skipping steps? A longer belt ( CoreXY vs Delta ) might act as a buffer, but would create more ringing.

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There isn't any way to automatically reduce acceleration and speed as a function of the Z coordinate, is there?

A 6DOF acceleration/rotation sensor like ABS-brake sensors ( seen on multicopter- or camera gimbal controller ) would be helpful. I have one of these on my balancing bot. They are extremely sensitve and easy to read out ( I2C protocol IIRC ). Just have to set thresholds: et voilá auto speed control.]]> o_lampe CoreXY Machines Sun, 22 Jul 2018 02:15:41 -0400 https://reprap.org/forum/read.php?397,659980,829220#msg-829220 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,829220#msg-829220
I've been lurking in the nonlinear extrusion threads at the Duet forum for a while, and expect to dive in soon.

I am using a slightly modified, Chinese-made aluminum Titan, with an XCR3D (also Chinese made) hot-end. The pair have been working well, though I haven't been printing that much recently.

I don't intend to leave the acceleration so high- it just shakes everything too much. It's fine for low altitude prints, but if they get tall, I'm sure the shaking will take its toll on print quality. There isn't any way to automatically reduce acceleration and speed as a function of the Z coordinate, is there?]]> the_digital_dentist CoreXY Machines Sat, 21 Jul 2018 22:10:32 -0400 https://reprap.org/forum/read.php?397,659980,829185#msg-829185 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,829185#msg-829185
What extruder drive are you using? At that extrusion rate, you would probably benefit from using a double-drive extruder such as the Bondtech.]]> dc42 CoreXY Machines Sat, 21 Jul 2018 10:28:43 -0400 https://reprap.org/forum/read.php?397,659980,829184#msg-829184 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,829184#msg-829184
Here's a video of the printer running at these settings, and unlike most of those youtube videos of printers running at crazy speeds and accelerations, I have included a close look at the final print.

If the machine is printing at 200 mm/sec, laying down a 0.4 mm wide line that is 0.2 mm thick, the extruder has to squirt out 0.4 x 0.2 x 200= 16 mm^3/sec. If that much goes out, that much needs to go in... 1.75 mm filament has a cross sectional area of 2.4 mm^2. So printing at 200 mm/sec requires 16 mm^3/sec / 2.4 mm^2 = 6.65 mm/sec filament speed coming into the extruder, which should be very easy for the controller and motor to handle. With acceleration, I think the thing you have to worry about most is the drive gear teeth tearing up the filament, and the limit will have to be determined experimentally, and will depend on pinch roller tension, geometry of the teeth, hardness of the filament, etc. Time to run some more tests...]]> the_digital_dentist CoreXY Machines Sat, 21 Jul 2018 10:03:56 -0400 https://reprap.org/forum/read.php?397,659980,827376#msg-827376 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,827376#msg-827376


I'll look into adding an SDcard reader in the future- too many other things going on right now.
]]> the_digital_dentist CoreXY Machines Sat, 30 Jun 2018 17:38:35 -0400 https://reprap.org/forum/read.php?397,659980,826576#msg-826576 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,826576#msg-826576
However, if you can put the Duet on your main network then I think you will find it more convenient to upload GCode files through the web interface.]]> dc42 CoreXY Machines Sat, 23 Jun 2018 03:56:33 -0400 https://reprap.org/forum/read.php?397,659980,826558#msg-826558 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,826558#msg-826558
The Duet board has a connector for one of the ribbon cables to the Panel Due labeled SDCard. Is there any sort of interface chip required or can I just add an SD card slot on a breakout brard to the front panel of my printer and connect it there?

The spool holder is on youmagine.com here. It uses F608zz bearings and 8mm bolts for the axles, so it's pretty heavy duty. I drilled holes and added a couple bolts on the vertical pieces so it could rubber bands to keep the top roller pressed against the spool flanges. Springs would be nicer, but rubber bands work OK. I was using it at the makerspace but it was too complicated for people and they kept taking it apart and hanging the spool from the top roller! Doh! I think deckingman recently used a modified version to hold 5 spools for his printer.

I designed another one based on a design I saw on Thingiverse. It uses the spool's weight to keep rollers pressed against the flanges. It's a little more delicate/elegant, and the small spools don't work very well, but it's perfect for "normal" 1kg spools. It uses bearings taken from scrapped hard disk drives. See it here: [www.youmagine.com] This one has been at the makerspace for almost a year and no one has broken it or tried to take it apart yet. It can be a little tricky to load it with a spool because you have to hold the spool and deal with two moving arms on the holder.

Both spool holders effectively prevent the filament from springing off a full spool and tying itself into knots.

Both designs were made when I was using DesignSpark Mechanical, so there are no Fusion360, STEP, or IGES files available.]]> the_digital_dentist CoreXY Machines Fri, 22 Jun 2018 23:23:46 -0400 https://reprap.org/forum/read.php?397,659980,826524#msg-826524 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,826524#msg-826524
1. You can take the SD card out of the Duet and put in in a PC adaptor, then copy the file to it on the PC, then move it back again. Then you need to send M21 to the Duet to re-mount the card. In a future firmware release, we will detect the insertion and mount the card automatically.

2. If you have a PanelDue in your system, and it is connected to the Duet via the ribbon cable connector, then you can plug an SD card containing your GCode file into the PanelDue. Select card 1 in either PanelDue or the web interface to access the files on that card.

However, normally the PC that you slice the files on would be on the same network as the Duet, so it is easier to upload the GCode file via the web interface. There is a plugin for Cura to do this automatically.

HTH David

PS - I like that filament spool holder. Can you share the design?]]> dc42 CoreXY Machines Fri, 22 Jun 2018 14:43:44 -0400 https://reprap.org/forum/read.php?397,659980,826517#msg-826517 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,826517#msg-826517




The machine runs much quieter than it did with the SmoothieBoard, and of course, the firmware updates and config changes are very easy- just edit and reboot using the web console. I am unable to print by plugging in an SD card, which I miss, so I'm still figuring out a work flow that works for me. As a temporary measure, I am using a netbook connected to the Duet board via the network interface to upload gcode files to the uSD card on the Duet board, then print them.

Video here
]]> the_digital_dentist CoreXY Machines Fri, 22 Jun 2018 13:59:30 -0400 https://reprap.org/forum/read.php?397,659980,825662#msg-825662 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825662#msg-825662 Qdeathstar CoreXY Machines Thu, 14 Jun 2018 17:07:43 -0400 https://reprap.org/forum/read.php?397,659980,825614#msg-825614 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825614#msg-825614
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the_digital_dentist
Is a pump quieter than a fan?

In my experience, a low pressure/high volume water pump is almost silent. ( aquarium pump )
OTOH a 12V inline gas pump is louder than a fan.]]> o_lampe CoreXY Machines Thu, 14 Jun 2018 07:03:02 -0400 https://reprap.org/forum/read.php?397,659980,825585#msg-825585 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825585#msg-825585 chilicoke CoreXY Machines Thu, 14 Jun 2018 00:25:15 -0400 https://reprap.org/forum/read.php?397,659980,825581#msg-825581 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825581#msg-825581 the_digital_dentist CoreXY Machines Thu, 14 Jun 2018 00:01:33 -0400 https://reprap.org/forum/read.php?397,659980,825578#msg-825578 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825578#msg-825578 Qdeathstar CoreXY Machines Wed, 13 Jun 2018 21:31:41 -0400 https://reprap.org/forum/read.php?397,659980,825501#msg-825501 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,825501#msg-825501
The machine is not silent, but it is MUCH quieter than it was. 256:1 interpolated ustepping FTW! Video of first test print here.
Compare the sound level to that on this video.

Prior to the change over I had installed a very low cost hot end from China that came with a very quiet fan. I found that when I get the enclosure temperature up to 45C, the quiet fan isn't so quiet. It goes back to being quiet when the temperature goes down.]]> the_digital_dentist CoreXY Machines Wed, 13 Jun 2018 07:51:22 -0400 https://reprap.org/forum/read.php?397,659980,821732#msg-821732 Re: My coreXY design is progressing to the build stage https://reprap.org/forum/read.php?397,659980,821732#msg-821732 Tomorrow I will post some image. Sorry for poor English :-D]]> Danyit CoreXY Machines Wed, 09 May 2018 15:35:01 -0400