Migbot Prusa I3 Z axis problem Hello everyone, I received a Migbot Prusa I3 (the 3D Electron sold by 3D Printers Online Store). There is a problem with the Z axis: the nozzle can go down but can not go up. In the descent's direction, engines make a little noise, as if there was resistance. In the ascent's direction, engines produce even more noise and do not move. This problem is not systematic: after setting precisely the parallelism of the two trapezoidal rods there is no noise or resistance, nor up or down, but after a few movements, the problem reappears. This can happen at any level of the axis, at the top, bottom or middle, randomly. If I remove the Y axis, and that there is no weight on the Z axis, there is no noise or resistance: everything works. I tried to change the value of the potentiometer of the RAMP's Z axis (see picture), but without success. By default it was 0.8V. I tried to change several values ​​between the minimum (about 0.150mV) and maximum (about 1.8mV). mod_embed_images_loadimage('eacfca7560732e6658cae5fdca979928', '/forum/thumbcache/76a/0da/f95/929/bba/99e/8ed/05d/61b/b50/4f_800x400.png', 'http://forums.reprap.org/file.php?1,file=77453,filename=MKS_BASE_V1.jpg', 'https://reprap.org/forum/addon.php?406,module=embed_images,check_scaling=1,url=http%3A%2F%2Fforums.reprap.org%2Ffile.php%3F1%2Cfile%3D77453%2Cfilename%3DMKS_BASE_V1.jpg', '', 659314, 800, 400, 'Loading image ...', false); I made a video for you can see (and hear) the problem : [youtu.be] I can not even count the hours spent trying to solve this problem. Any help would greatly appreciated. Thank you in advance :) PS: Excuse my English, it's not my native language https://reprap.org/forum/read.php?406,659314,659314#msg-659314 Sat, 07 Mar 2026 09:41:27 -0500 Phorum 5.2.23 https://reprap.org/forum/read.php?406,659314,663512#msg-663512 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,663512#msg-663512 wampablo Prusa i3 and variants Fri, 13 May 2016 14:16:26 -0400 https://reprap.org/forum/read.php?406,659314,663025#msg-663025 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,663025#msg-663025
Quote
Ceax
Xav987, parles tu français?

Si oui, j'ai eu un problème similaire. J'ai simplement enlever 2 vis sur 4 (de chaque coté) sur les écrous en laiton fixés les pièces en plastique.
Pour ma part, le fait qu'il y ai les 4 vis bridait de travers l'écrou sur la vis trapézoïdale.
Depuis, plus de problème.
Oui, je parle français, je vais essayer ça, merci.]]> Xav987 Prusa i3 and variants Thu, 12 May 2016 06:55:19 -0400 https://reprap.org/forum/read.php?406,659314,662948#msg-662948 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,662948#msg-662948 evetanlm Prusa i3 and variants Thu, 12 May 2016 02:43:04 -0400 https://reprap.org/forum/read.php?406,659314,662947#msg-662947 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,662947#msg-662947 evetanlm Prusa i3 and variants Thu, 12 May 2016 02:42:35 -0400 https://reprap.org/forum/read.php?406,659314,662927#msg-662927 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,662927#msg-662927
Si oui, j'ai eu un problème similaire. J'ai simplement enlever 2 vis sur 4 (de chaque coté) sur les écrous en laiton fixés les pièces en plastique.
Pour ma part, le fait qu'il y ai les 4 vis bridait de travers l'écrou sur la vis trapézoïdale.
Depuis, plus de problème.

I had a similar problem. I simply removing 2 screws on the 4 (on each side) on the brass nuts attached plastic parts.
For me, the fact that there have bridled the 4 screws through the nut of the trapezoidal screw.
Since then, no problem.]]> Ceax Prusa i3 and variants Thu, 12 May 2016 00:24:13 -0400 https://reprap.org/forum/read.php?406,659314,662781#msg-662781 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,662781#msg-662781 Xav987 Prusa i3 and variants Wed, 11 May 2016 13:19:41 -0400 https://reprap.org/forum/read.php?406,659314,661147#msg-661147 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,661147#msg-661147 drive.google.com]
[forums.reprap.org]]]> evetanlm Prusa i3 and variants Sat, 07 May 2016 04:04:50 -0400 https://reprap.org/forum/read.php?406,659314,660611#msg-660611 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660611#msg-660611 Xav987 Prusa i3 and variants Thu, 05 May 2016 12:33:18 -0400 https://reprap.org/forum/read.php?406,659314,660604#msg-660604 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660604#msg-660604 evetanlm Prusa i3 and variants Thu, 05 May 2016 12:20:28 -0400 https://reprap.org/forum/read.php?406,659314,660579#msg-660579 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660579#msg-660579 I don't have the sources, but it is a Marlin with custom configuration.
I can't be sure, but I think the configuration is this one : [forums.reprap.org] (see the second post).
Do you know if I can decompile it directly from the motherboard?]]> Xav987 Prusa i3 and variants Thu, 05 May 2016 10:44:27 -0400 https://reprap.org/forum/read.php?406,659314,660563#msg-660563 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660563#msg-660563 evetanlm Prusa i3 and variants Thu, 05 May 2016 10:01:43 -0400 https://reprap.org/forum/read.php?406,659314,660554#msg-660554 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660554#msg-660554 [youtu.be]
First in the ascent's direction, then in descents direction.]]> Xav987 Prusa i3 and variants Thu, 05 May 2016 09:41:14 -0400 https://reprap.org/forum/read.php?406,659314,660517#msg-660517 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660517#msg-660517 evetanlm Prusa i3 and variants Thu, 05 May 2016 08:10:44 -0400 https://reprap.org/forum/read.php?406,659314,660514#msg-660514 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660514#msg-660514
What you call leadscrew is it what I call trapezoidal rods? Like that : [upload.wikimedia.org]
The two Z motors can move well if they're not bind to anything.
I will able to make a video in a few hours.]]> Xav987 Prusa i3 and variants Thu, 05 May 2016 08:07:23 -0400 https://reprap.org/forum/read.php?406,659314,660405#msg-660405 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660405#msg-660405 evetanlm Prusa i3 and variants Thu, 05 May 2016 02:31:07 -0400 https://reprap.org/forum/read.php?406,659314,660044#msg-660044 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,660044#msg-660044 Xav987 Prusa i3 and variants Wed, 04 May 2016 04:56:24 -0400 https://reprap.org/forum/read.php?406,659314,659646#msg-659646 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,659646#msg-659646 If so, the answer is yes, as you can see in the video that I posted in my first post.

So you think one of the two Z motors is faulty, or not enough powerfull ? If it's a power problem, increase the value of the RAMP's Z axis should have fixed the problem, dont you think ?]]> Xav987 Prusa i3 and variants Tue, 03 May 2016 05:17:12 -0400 https://reprap.org/forum/read.php?406,659314,659561#msg-659561 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,659561#msg-659561 evetanlm Prusa i3 and variants Mon, 02 May 2016 21:08:26 -0400 https://reprap.org/forum/read.php?406,659314,659360#msg-659360 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,659360#msg-659360 Xav987 Prusa i3 and variants Mon, 02 May 2016 11:32:01 -0400 https://reprap.org/forum/read.php?406,659314,659349#msg-659349 Re: Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,659349#msg-659349 gotswrv Prusa i3 and variants Mon, 02 May 2016 10:56:52 -0400 https://reprap.org/forum/read.php?406,659314,659314#msg-659314 Migbot Prusa I3 Z axis problem https://reprap.org/forum/read.php?406,659314,659314#msg-659314
I received a Migbot Prusa I3 (the 3D Electron sold by 3D Printers Online Store).

There is a problem with the Z axis: the nozzle can go down but can not go up.
In the descent's direction, engines make a little noise, as if there was resistance. In the ascent's direction, engines produce even more noise and do not move.

This problem is not systematic: after setting precisely the parallelism of the two trapezoidal rods there is no noise or resistance, nor up or down, but after a few movements, the problem reappears.

This can happen at any level of the axis, at the top, bottom or middle, randomly.

If I remove the Y axis, and that there is no weight on the Z axis, there is no noise or resistance: everything works.

I tried to change the value of the potentiometer of the RAMP's Z axis (see picture), but without success. By default it was 0.8V. I tried to change several values ​​between the minimum (about 0.150mV) and maximum (about 1.8mV).


I made a video for you can see (and hear) the problem : [youtu.be]

I can not even count the hours spent trying to solve this problem. Any help would greatly appreciated. Thank you in advance :)

PS: Excuse my English, it's not my native language
]]> Xav987 Prusa i3 and variants Mon, 02 May 2016 08:59:00 -0400