Migbot Prusa i3 Unofficial Support Thread You know how the old saying goes: "You get what you pay for." The Migbot Prusa i3 is one of those ridiculously inexpensive 3DPs coming from China. It has a few good things going for it. Technical support is not one of them :) There is no B.O.M. per se. Only some PDFs and images to guide you in the assembly process. This isn't terrily bad if you never want to touch the pre-installed firmware, but if you are looking to upgrade to newer Marlin or Repetier code, you need to know a bit about the pulleys, belts, and lead screws. All of this information is practically non-existant, or difficult to get to. Even the pre-loaded firmware sources are unavailable... Until now. [b]Marlin Configuration[/b] In the next message, [url=http://forums.reprap.org/read.php?406,507737,507742#msg-507742]I have posted the Configuration.h from the vendor supplied firmware.[/url] Many Bothans died to bring us this information. I do not own this printer model, but I have been providing support to a friend half way across the planet, so I have learned a lot about it in a very short amount of time. Hopefully this thread will become a useful resource to the rest of you poor souls :) [b]Experimenting with Repetier Firmware[/b] For any of you feeling adventurous, I have also provided a .json file that can be used to load initial settings into the Repetier Firmware Configuration Tool. It is not yet a working configuration due to the fact that I don't know exact coordinate system of the printer, and I am not sure about the endstop states (normally open?). If you work with this, and have any information I can correct, I will be happy to provide updates to the .json file. Here is some of the information I need: 1. X-Axis. How far from the X-Home position to the edge of the print area? 2. Y-Axis. How far from the Y-Home position to the edge of the print area? 3. If you X-Limit installed on the right, or left. So far, my understanding is that it is on the right, but it is the MIN endstop. Is this right? If so, it means the X axis motion must be inverted. 4. These kits come with a leveling sensor. As far as I can tell, it is a non-contact of some kind, and is installed 2mm above the surface. The current .json file has autoleveling disabled. If you can figur it out for Repetier, post your results here, and I will update. https://reprap.org/forum/read.php?406,507737,507737#msg-507737 Sun, 09 Aug 2026 22:23:05 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?406,507737,836355#msg-836355 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,836355#msg-836355
You will have to set the new board up from scratch. It would be a good time to also go to the latest firmware as well.

I keep looking at updating my firmware but it is running fine as it is and I am afraid of screwing it up in trying to get the settings correct.

Regards,
Dave W]]> Dave_W Prusa i3 and variants Tue, 16 Oct 2018 18:01:30 -0400 https://reprap.org/forum/read.php?406,507737,835952#msg-835952 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,835952#msg-835952 kissfan4 Prusa i3 and variants Thu, 11 Oct 2018 07:04:07 -0400 https://reprap.org/forum/read.php?406,507737,829009#msg-829009 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,829009#msg-829009 Marlin firmware (1.1.8). The configuration file changed quite a bit from the original version so if you need something to start with, here are my final config files.

Make sure you adjust your travel limits etc.! My printer is slightly modified in some aspects so it probably does not match the original.]]> H:S Prusa i3 and variants Thu, 19 Jul 2018 14:01:14 -0400 https://reprap.org/forum/read.php?406,507737,818596#msg-818596 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,818596#msg-818596 thanks]]> Taisiya Prusa i3 and variants Sat, 14 Apr 2018 13:17:06 -0400 https://reprap.org/forum/read.php?406,507737,764733#msg-764733 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,764733#msg-764733
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sdw_nj
Does anyone know what the proper name for the connectors that plug the end stop wiring in to the board? I'd like to replace the wiring on my y axis end stop. I was able to identify a compatible switch for the end stop but am still trying to figure out what the compatible part would be for the wiring connector.

They're JST Balance charger LiPo connectors]]> Ax Prusa i3 and variants Thu, 27 Apr 2017 18:05:53 -0400 https://reprap.org/forum/read.php?406,507737,764726#msg-764726 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,764726#msg-764726 sdw_nj Prusa i3 and variants Thu, 27 Apr 2017 17:16:30 -0400 https://reprap.org/forum/read.php?406,507737,750554#msg-750554 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,750554#msg-750554 which uses this adpater board ) but don't know how to hook up/configure the adapter board to the MKS Base 1.3 board. All online references are for RAMPS and Megatronics. I want to get all my ducks in a row before I order it. Any help would be appreciated. thanx in advance.]]> veaceonee Prusa i3 and variants Tue, 21 Feb 2017 16:42:14 -0500 https://reprap.org/forum/read.php?406,507737,734822#msg-734822 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734822#msg-734822 Will report back once this is done, hopefully solves the problem.]]> IBaz Prusa i3 and variants Mon, 02 Jan 2017 04:43:31 -0500 https://reprap.org/forum/read.php?406,507737,734792#msg-734792 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734792#msg-734792
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IBaz
No glass. Just the heatbed under the aluminium build plate as per the OEM setup. I've just added a PEI sheet to the top of this originally thinking the original probe would have enough distance to read through the PEI but it didn't. This is why I went for this probe but it just doesn't seem to sense correctly.

For best results, the sensor needs to sense the reflection from the top surface of the bed. There is a potential problem when the sensor is used with a transparent bed material that reflects infrared light weakly and there is a surface below the transparent material that reflects IR much more strongly. Here is a guide to using the sensor with different print surfaces:

Glass (with or without coatings such as hairspray, PVA or Kapton tape): works as-is if placed directly on a PCB bed heater or other surface that does not reflect strongly. If there is an aluminium heat spreader or bed plate underneath the glass, then either paint the aluminium surface matt black (see below), or put a sheet of matt black paper between the glass and the aluminium.
PEI: this is highly transparent to IR. Paint the underside matt black before using adhesive sheet to attach it to the bed plate.
BuildTak: the dark grey variant works well with the sensor. I have not tested the white variant.
PrintBite: works well with the sensor.
Bright aluminium: not suitable unless the sensor is modified to reduce its sensitivity, because the strong reflection will saturate the sensor.
If you need to paint the top of an aluminium heat spreader or the underside of a PEI sheet matt black, then I recommend using spray-on barbecue & stove paint. It needs to be cured at an elevated temperature to harden. I have found 2 hours at 170C in a domestic electric fan oven works well.


I personally use a sheet of black construction paper between the glass and the aluminum. I had issues untill I did that]]> Wes78 Prusa i3 and variants Sun, 01 Jan 2017 23:23:06 -0500 https://reprap.org/forum/read.php?406,507737,734791#msg-734791 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734791#msg-734791 IBaz Prusa i3 and variants Sun, 01 Jan 2017 23:20:10 -0500 https://reprap.org/forum/read.php?406,507737,734790#msg-734790 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734790#msg-734790 Wes78 Prusa i3 and variants Sun, 01 Jan 2017 23:14:02 -0500 https://reprap.org/forum/read.php?406,507737,734788#msg-734788 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734788#msg-734788 IBaz Prusa i3 and variants Sun, 01 Jan 2017 23:00:08 -0500 https://reprap.org/forum/read.php?406,507737,734786#msg-734786 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734786#msg-734786
// 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 true // set to true to invert the logic of the endstop.
#define Y_MAX_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define Z_MAX_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define Z_MIN_PROBE_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.

change this one from--> #define Z_MIN_PROBE_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.

to this---> #define Z_MIN_PROBE_ENDSTOP_INVERTING false // set to true to invert the logic of the endstop,

save and reflash.

once flashed send an M119 to make sure that the Z is now un-triggered]]> Wes78 Prusa i3 and variants Sun, 01 Jan 2017 22:50:11 -0500 https://reprap.org/forum/read.php?406,507737,734783#msg-734783 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734783#msg-734783 - goes to - , + gose + and Signal goes to Signal , when wiring up to your bored. Simple as that.
Just like the stock sensor.


However....
The very first thing you need to do once you have the sensor operational on your printer is to type in m119 in a command line and verify rather or not the Z end stop has been triggered. You might even hold something under the sensor to have the light come on and running m119 to see if it's untriggered
If the Z end stop has been triggered it will not allowed to home z, because it thinks it's already there

If it shows that it has been triggered you will need to invert the signal within the Marlin firmware and reflash it to your board.

Easy peasy]]> Wes78 Prusa i3 and variants Sun, 01 Jan 2017 22:23:34 -0500 https://reprap.org/forum/read.php?406,507737,734782#msg-734782 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,734782#msg-734782
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IBaz
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Wes78
An alternative to the factory sensor, especially for those that want to print on glass. I have this sensor on my other printers and it works Flawlessly.
It's a plug and play. The only thing will probably have to do is invert the in endstop signal.

[www.dropbox.com]


[www.filastruder.com]


Thanks Wes. I found a local company that supplies a similar sensor based off that one. Going to give it a go.

OK, I have finally gotten around to installing this sensor but it isn't plug and play. I have wired it in to what I believe to be the correct manner but when homing the z-axis will not move down. I can make the LED come on by manually moving towards the bed or any object to make it sense something but it just won't do it automatically. Do I have to invert the endstop signal as Wes suggested? If so how do I go about it?]]> IBaz Prusa i3 and variants Sun, 01 Jan 2017 22:05:58 -0500 https://reprap.org/forum/read.php?406,507737,730993#msg-730993 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,730993#msg-730993
Anyone have any experience with a BLTouch Sensor (Like this one)? Looks like it would be ideal for people with non-metallic build plates.]]> veaceonee Prusa i3 and variants Fri, 16 Dec 2016 05:19:51 -0500 https://reprap.org/forum/read.php?406,507737,730000#msg-730000 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,730000#msg-730000 Wes78 Prusa i3 and variants Mon, 12 Dec 2016 12:03:34 -0500 https://reprap.org/forum/read.php?406,507737,729998#msg-729998 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729998#msg-729998
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Wes78
....actually let me get straight to the point, when you have leaking heater block . More often then not means you nozzle isn't fully seated against the heat brake. There should not ever be a gap between the nozzle and the heat brake. This will not only cause a leaking heater block but also increase your chances of a jam.

My suggested procedure would be screwing in the tip to the heater block once at bottom back it off roughly half of turn then screw in the heat break until it bottoms out on top of the nozzle.
Then putting a wrench on the heater block and one on the nozzle tighten them firmly just be careful not to over tightened and stripped the heater block.

Thanks for that. What I had done was close, but without the backing off of the nozzle and retightening. I'll give that a whirl.

Thanks,
J]]> uberjay Prusa i3 and variants Mon, 12 Dec 2016 11:58:14 -0500 https://reprap.org/forum/read.php?406,507737,729995#msg-729995 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729995#msg-729995
My suggested procedure would be screwing in the tip to the heater block once at bottom back it off roughly half of turn then screw in the heat break until it bottoms out on top of the nozzle.
Then putting a wrench on the heater block and one on the nozzle tighten them firmly just be careful not to over tightened and stripped the heater block.]]> Wes78 Prusa i3 and variants Mon, 12 Dec 2016 11:44:22 -0500 https://reprap.org/forum/read.php?406,507737,729988#msg-729988 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729988#msg-729988
As I think about it now, I did have the gap down (toward the hot end) before I had a jam. After the jam I switched it thinking it was for the set-screw. DOH!

Going to flip it and get back to the way it should be. As a side note, the gap-up orientation really made it hard to get my bed sensor aligned right ;-).

Cheers,
J.]]> uberjay Prusa i3 and variants Mon, 12 Dec 2016 11:25:15 -0500 https://reprap.org/forum/read.php?406,507737,729986#msg-729986 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729986#msg-729986 I usually put right above the heater block, so the top plane of the block is even with the start of the break.

Heat creeping up is a bad thing.]]> jazzbassNick Prusa i3 and variants Mon, 12 Dec 2016 11:18:33 -0500 https://reprap.org/forum/read.php?406,507737,729985#msg-729985 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729985#msg-729985 Wes78 Prusa i3 and variants Mon, 12 Dec 2016 11:18:26 -0500 https://reprap.org/forum/read.php?406,507737,729982#msg-729982 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729982#msg-729982
Just wondering if this could be why my hot-end / threaded feed tube are leaking - if I have it upside down? I thought the thread looked about the same - maybe it is not??

[attachment 87298 ScreenShot12-12-16at11.09AM.JPG]

Thanks,
Jason.]]> uberjay Prusa i3 and variants Mon, 12 Dec 2016 11:13:24 -0500 https://reprap.org/forum/read.php?406,507737,729321#msg-729321 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729321#msg-729321 I like it a lot better cause its smaller and the way it clamps on to the heater cartage is much much better then the stock one it came with
i allso moded the heat brake so that i can run the inner from the tip all the way to the gear from the motor]]> Wes78 Prusa i3 and variants Fri, 09 Dec 2016 14:49:53 -0500 https://reprap.org/forum/read.php?406,507737,729318#msg-729318 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729318#msg-729318
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jazzbassNick
I had replaced the threaded tube prior.
The heater blocks I ordered aren't available - I'm not sure I'd recommend anyway since it didn't have a grub screw to hold the thermistor in, had to use kapton tape.
Here's the links to both the tubes and the blocks:
[www.amazon.com]
[www.amazon.com]

Looks like there's some similar available though.

Thanks, that helped me find something available on the Canadian Amazon site:
[www.amazon.ca]]]> uberjay Prusa i3 and variants Fri, 09 Dec 2016 14:42:16 -0500 https://reprap.org/forum/read.php?406,507737,729316#msg-729316 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729316#msg-729316
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uberjay

Thanks... don't suppose you still have the links to the blocks you bought?

Also... did you replace the threaded tube as well or just the block?

Thanks,
J

I had replaced the threaded tube prior.
The heater blocks I ordered aren't available - I'm not sure I'd recommend anyway since it didn't have a grub screw to hold the thermistor in, had to use kapton tape.
Here's the links to both the tubes and the blocks:
[www.amazon.com]
[www.amazon.com]

Oh, I think I did use some teflon tape (the really thin white stuff) on the threads of the tube, if that's the tape you were asking about.

Looks like there's some similar available though.]]> jazzbassNick Prusa i3 and variants Fri, 09 Dec 2016 14:39:04 -0500 https://reprap.org/forum/read.php?406,507737,729308#msg-729308 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729308#msg-729308
[attachment 87162 smallpic1.jpg]

[attachment 87163 smallpic2.jpg]]]> Wes78 Prusa i3 and variants Fri, 09 Dec 2016 13:37:46 -0500 https://reprap.org/forum/read.php?406,507737,729188#msg-729188 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729188#msg-729188
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jazzbassNick
When this happened to me, I found that some of the threads of the heater block had actually disintegrated and fell out. I think I ended up getting a set of 5 heater blocks on Amazon.

Thanks... don't suppose you still have the links to the blocks you bought?

Also... did you replace the threaded tube as well or just the block?

Thanks,
J]]> uberjay Prusa i3 and variants Thu, 08 Dec 2016 22:32:12 -0500 https://reprap.org/forum/read.php?406,507737,729184#msg-729184 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729184#msg-729184 jazzbassNick Prusa i3 and variants Thu, 08 Dec 2016 21:18:29 -0500 https://reprap.org/forum/read.php?406,507737,729182#msg-729182 Re: Migbot Prusa i3 Unofficial Support Thread https://reprap.org/forum/read.php?406,507737,729182#msg-729182
If it were a water pipe I would just wrap it in silicone tape. I worry though that the stuff from the hardware store might not be rated for the temps here.

Anyone have any ideas / recommendations for a quick fix that doesn't require an online order and shipping delays? :)

Or... am I screwed and need to buy a new hotend/threaded tube?

Thanks in advance,
Jason.]]> uberjay Prusa i3 and variants Thu, 08 Dec 2016 20:58:46 -0500