Quantcast
Channel: Reprap Forum - CoreXY Machines
Viewing all 550 articles
Browse latest View live
↧

AliExpress CoreXY Kit Questions (2 replies)

March 28, 2017, 5:23 pm
$
0
0
Hello,
I am looking at a CoreXY kit on AliExpress (specifically this kit: goo.gl/mFZeOz) I have a few questions about it though, as I am new to building printers I apologize if they come off as dumb questions.
1) How tough are these to assemble? Is there documentation to help guide me through the process?
2) How hard is it to setup the dual extruder as opposed to the single extruder? The dual extruder would be beneficial for me as some of the objects I design would benefit greatly from dissolvable support material.
Overall I am just looking for suggestions and input from those of you who are more experienced in building these than I am.
↧
Search

CORE XY Enclosure (2 replies)

April 6, 2017, 3:24 am
$
0
0
I have just built an enclosure for my CoreXY printer.

I used 16mm thick MDF (Fibre wood) sheets with two 10mm thick polycarbonate doors.

My power supply sucks in air from outside of the enclosure and the bulk of the air is expelled outside of the enclosure. A small amount of air goes from the power supply into the enclosure and there is a small fan which expells air from a box which houses the Ramps PCB.
Still need to make an air chute from the power supply directly to the ramps box.
I don’t think this will increase enclosure temperature by anything much.

I have found that when printing with ABS with my heat bed at 90C, I get a temperature at the top inside of my enclosure of approx 35C and at the bottom approx 31C. I do have a end of print cooling fan which would properly even out the temperatures if I turned it on, however this would reduce the temperature at the print area.

I’m thinking that the only way to increase the enclosure temperatures is to use an additional heater as there’s not enough room to add insulation to the inside of my enclosure.

Overall I am happy with the reduced noise, less smell, more constant temperature around the printer, also keeps filament drier and keeps dust out of the printer.
↧
↧

Looking for a 3D Printer that meets these specs: (1 reply)

April 8, 2017, 7:20 pm
$
0
0
All Metal Hot-End
Hardened Nozzle
Enclosed Case
HEPA + Carbon Filter
Heated Bed

Basically, I want to be able to print with all the different materials available, safely.

The closest I've found so far is the Fusion3 F400, but its too expensive for me.

Any suggestions?

Thanks!
↧

X and Y Stepper Motor Noise (4 replies)

April 15, 2017, 8:24 am
$
0
0
Ok I am in the process of building my printer and I am having issues locating the source of all the noise while moving the x and y axes. The z axis is quite as well as the extruder is the same style motor as my x and y motors. Below is the video of the noise. Any help would be great.

X and Y Stepper Motor Noise
↧

z axis not lowering. (1 reply)

April 16, 2017, 11:35 pm
$
0
0
Hi,i have built a corexy machine to Tech2c's hypercube design,but have a final problem to solve before it will print.
When homing the z axis,it goes to the top of it's travel as required,and triggers the end stop.
But when then trying to lower the bed,using manual control,thebed doesn't move.
I've changed the endstop positions,reversed motor direction,etc.,but can not get the correct movements.
Could someone please have a look at my marlin end stop configs,and have any comments?
Thanks for your time.

//==============================//===========================================================================
Endstop Settings ===========================
//===========================================================================

// @section homing

// Specify here all the endstop connectors that are connected to any endstop or probe.
// Almost all printers will be using one per axis. Probes will use one or more of the
// extra connectors. Leave undefined any used for non-endstop and non-probe purposes.
#define USE_XMIN_PLUG
#define USE_YMIN_PLUG
#define USE_ZMIN_PLUG
//#define USE_XMAX_PLUG
//#define USE_YMAX_PLUG
//#define USE_ZMAX_PLUG

// coarse Endstop Settings
#define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors

#if DISABLED(ENDSTOPPULLUPS)
// fine endstop settings: Individual pullups. will be ignored if ENDSTOPPULLUPS is defined
//#define ENDSTOPPULLUP_XMAX
//#define ENDSTOPPULLUP_YMAX
//#define ENDSTOPPULLUP_ZMAX
//#define ENDSTOPPULLUP_XMIN
//#define ENDSTOPPULLUP_YMIN
//#define ENDSTOPPULLUP_ZMIN
//#define ENDSTOPPULLUP_ZMIN_PROBE
#endif

// Mechanical endstop with COM to ground and NC to Signal uses "false" here (most common setup).
#define X_MIN_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define Y_MIN_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define Z_MIN_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define X_MAX_ENDSTOP_INVERTING false // set to true to invert the logic of the endstop.
#define Y_MAX_ENDSTOP_INVERTING false // set to true to invert the logic of the endstop.
#define Z_MAX_ENDSTOP_INVERTING false // set to true to invert the logic of the endstop.
//#define Z_MIN_PROBE_ENDSTOP_INVERTING false // set to true to invert the logic of the endstop.

// Enable this feature if all enabled endstop pins are interrupt-capable.
// This will remove the need to poll the interrupt pins, saving many CPU cycles.
//#define ENDSTOP_INTERRUPTS_FEATURE
↧
↧

echo: too long extrusion prevented (1 reply)

April 23, 2017, 12:46 pm
$
0
0
I built a hypercube printer and everything is working but my extruder motor. I can swap the motor connector to the x or y axis and motor works verifing the motor curcuit is ok swaped drivers and driver ok. When I try to extrude in prompterface I get (echo: too long extrusion prevented) Help please
↧

Advice on belt path (3 replies)

April 24, 2017, 4:44 am
$
0
0
Hi all, I have been lurking on the forums for about a year and have slowly been prepping for a corexy build. I have all my motors, electronics and linear rails, etc. My next step is to get the 8020 extrusion and some .125" aluminum plate cut but i need my design finalized and would like any advice on how I have my belts crossing at the front of the printer. As you can see the belts are all on the same plane except at the front, where they cross and the maximum separation is 14mm, the angle in relation to the top/level plane is 0.8 deg. I will be using 3GT belt and smooth idlers with a 17.5mm diameter that have a small shoulder on them. Can anyone with some previous experience guide me on if this well make the belts wear excessively? I do plan on having the printer running non stop for quiet some time. Thanks for any input and feel free to ask any questions, I do plan on starting a build page shortly when things begin.
↧

[Poll] Bed mounted on springs ( prusa-style ) ? (6 replies)

May 1, 2017, 4:48 am
$
0
0
OK, now I have a super stiff frame, a flat tooling plate and everything is levelled to the max. ( mean error 0.03 and deviation -0.02 according RRF mesh bed leveling )
But now I miss the soft and forgiving bed mount I had on my Prusa i3.
The nozzle ran into every little blob, caused by the damn Bowden tube retraction. ( 2.5mm retraction @ 80mm/s ) and skipped steps.
On my Prusa it would just scratch a bit, and the flexible "frog" and springs would prevent the worst.

So the question is, should I replace the nylon posts that connect the tooling plate with the bed frame with springs? ( feels like a sacrileg )
How have you done it?
↧
Search

Tracking Axis movement with Rotary Encoders (5 replies)

April 30, 2017, 11:08 pm
$
0
0
Hi Guys,

I'm currently building my own CoreXY printer, as my Geeetech clone is on its way out so using one last time to build my next printer.

Now I want to see if i can get rid of using end stops and replace them with rotary encoders to accurately track the axis position (alleviating the need for regular re-calibration), looking to use these optical encoders [www.ebay.com.au]

My Question is, what input do I use on the board to read the pulses from the encoder, also is there a routine in Marlin that can read this input, or am I looking at making a modification to marlin myself.

Talk Soon
Paul (Celcius1)
↧
↧

Switch to horizontal dual x linear rails? (5 replies)

May 1, 2017, 11:40 am
$
0
0
Okay so my corexy stage looks like this, it began as a smartrapcore alu:
[attachment 93593 IMG_20170430_150343.jpg]

Recently switched from 8mm rods (vertically stacked on x) to linear rails.

It prints well (running on re-arm now) but I'm thinking about trying dual horizontal x-rails to have no cantilevering of the hotend/extruder. I will end up losing a bit of y build space.

How much of an improvement might I expect? Anyone made the same change care to comment on what effect they saw doing this?

I just can't quite decide if the improvement will be too marginal to be worthwhile or not. Its only one rail and some redesigned y-carriages, and an x carriage.
↧

Core XY mystery (4 replies)

May 4, 2017, 11:35 am
$
0
0
I recently built a corexy. It is running pretty well. In some of my final calibration, I noticed one area that is off.

Say you print a tall square object. Looking from the front of the bed, If the object is 150mm tall, If I check the left side of the object to the bottom of the object I find that the object is not a square 90 degree angle, it is slightly less. Meaning that the upper layers drift very slightly to the right. Over 150mm object, I measured the drift at about 1.5mm.

So the first thing I checked was the bed, to see if it was moving up and down or at a slight diagonal. To the best of my measuring abilities, it is moving squarely down, and not drifting to the side.

Here is a writeup on my printer;
n9jcv Hypercube

I then checked the frame by measuring the rectangles/squares diagonally and they all appear to be exact, at least to the best of my measuring

I can not think of what else would cause this. Any ideas?

Thanks
↧

Poor Man's Digital Dentist Core XY build (1 reply)

May 5, 2017, 8:54 pm
$
0
0
I am building a printer similar to Digital Dentist's build and will use many of his ideas.

I wil take some close up pictures soon, as i have made some changes (READ: Sacrifices) due to lack of a milling machine.


Anyway, here is a video of a potential problem:

[youtu.be]


In the video, I am holding one side of the y grantry still, but as you can see, i am still able to move the other side a little bit. Is that a problem? I assume once i get the belts on it probably won't be a problem, but i wanted to get some opinions on that first! Thanks.
↧

Moving bed or Moving Gantry(Head) (no replies)

May 6, 2017, 3:38 am
$
0
0
Hi Guys,

I'm building a CoreXY printer, and using a Dual Wire Gantry drive system. [reprap.org])

But for the bed movement I'm going to go with the wire system as well for its drive, but cant decided whether to have a moving gantry or a moving bed in the Z axis.

I'm leaning towards moving the Bed in the Z, but was curious, would it be better to move the gantry instead.

Celcius1
↧
↧

Core XY vs Hbot Build (no replies)

May 10, 2017, 12:33 am
$
0
0
Hi Guys,

I have never tried building a Hbot before but I heard from a lot of people that its not as good as Corexy.
is it mainly the racking of the gantry that people have a problem with.

I will be creating most of the parts using 5mm Aluminium so it will be very strong.

This is the first design that uses Corexy, this has extra extruder attachments on the side [attachment 93958 1.png]

However i wanted to have the extruder attachments in the front like this using H bot, but I am not sure if this is a good idea comparing core xy and hbot [attachment 93959 2.png]

I simply need a design that would allow me to put the extruders in the front and the motors in the back, core xy system the belts come in the way. any suggestions?
↧

Belt Slap causing Shifting Layer (no replies)

May 10, 2017, 11:41 am
$
0
0
I've calibrated the angle of the frame best i can. The XY motor is rated 34mm, 1.33 amps, 2.1ohm, 2.5mH, 2.3kgcm holding torque. I've adjusted the a4988 for both x and y at 0.5 (some miss step), 0.6 and 0.7. This video is taken at 0.6vref for both xy.
The 1st layer speed is 20mm/s when the shifting layer happen in the video. The motor is always much cooler than the print bed which is 58c. Previous prints, sometimes i get away with the problem until after 2-8 hours before shifting layers again. In between the shifting layering is very good and smooth. I've even switch extruder and z axis a4988 with x and y to no avail. I figure it might be the chinese knockoff mgn12h linear guide but when i move it, its ok. Well there is some binding if i exaggerated cantilever force on the linear guide. But is don see why this can cause the belt slap which ONLY happen 1 out of hundreds layers.

The belt slap]
↧
Search

CoreXY, fixed bed (no replies)

May 12, 2017, 2:02 am
$
0
0
Any issues with my idea of a CoreXY design with fixed bed?



using 2x300mm MGN12 rails for Y and 1x400mm MGN12 rail for X. And then there is 20x20 T-Slot extrusion holding the Y rails and they are fixed together with a 20x60 T-Slot in the back.

I have 3 lead screws for the z-axis (200-300mm) and I am planning to use one stepper for each screw, to get the bed leveling like the Sparkcube v1.1 XL.

Will the open front gantry design flex to much?
↧

Hypercube xy distortion (1 reply)

May 26, 2017, 11:18 pm
$
0
0
Hello,

I have notice a weird distortion, and I'm struggling to understand why it iexists.
The attached image show a 100mm x 100mm square.
What you will notice is a slight curving towards the bottom right.
It's about 102 on the bottom and right hand side.

Can anyone suggest what might be causing that?

Regards


Matt
↧
↧

3kg plus print head anyone? (5 replies)

May 29, 2017, 2:00 am
$
0
0
Here is a link to the latest evolution of my printer [www.youtube.com]

Alternative titles

"One way to mount 3 extruders on a 600mm x 600mm x 1,000mm frame and keep the Bowden tube length down to 170mm"

or

"Why you probably don't need Nema 23s as Nema 17s will likely do the job.
↧

Problem with oval shapes. (2 replies)

June 2, 2017, 6:10 am
$
0
0
Hello.
My printer is similar to SparkCube but has some my modyfications.
I'v problem with oval shapes.
[attachment 94881 circle1.jpg]
[attachment 94882 circle2.jpg]
Rectangular shapes are ok.
[attachment 94880 rect.jpg]
Do you have any idea what might be wrong?
↧

Moving a heavy bed (1 reply)

June 3, 2017, 4:02 am
$
0
0
Hi guys,

I'm trying to pick up a build I've begun with a large print bed using a CoreXY config.

Anyway, the one thing I'm not 100% confident about is the way I'm thinking about moving the bed vertically. I really would like to know what the best options are out there for this.The whole machine is around 750x750x750mm, so it's quite large. Original thoughts were based on the Vulcanus Max but I wanted to change a few bits and bobs like the bed design. I was considering powering it with a MKS SBASE (have a v1.2 sitting here) but that's up for debate if it's not likely to work well.

Probably the biggest concern I have is that it's quite a large format with an effective printing area of 500x500mm. I've decided to go with a milled aluminium bed (has a flatness of +-0.38mm over 6ft, apparently) which is going to be amazing, but of course the weight is going to hurt - it's about 10kg just for the aluminium. Then there's the rails under it, heat pad, and anything that I print on it. One does not simply print light items with a machine that big. I'm guessing I need to support at least 15kg and this has been built into the bearings and whatnot I've sourced.

Original thoughts were to have three leadscrews mounted at different points, all connected by a common belt, driven by a single stepper (possibly geared down somehow to provide better resolution/torque). Not sure if a short Nema23 could drive that or if my electronics are capable, but I'm willing to buy more bits if I got that wrong.

Anyway, would love to hear peoples' thoughts, experiences and hopefully I'll absorb a bit of knowledge. Thanks.
↧
Viewing all 550 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>