Hi, I have a self built D-bot with a good few modifications including linear rails. I'm having great difficulty in identifying and solving a serious vibration/noise seemingly coming from the X-axis. See attached video. The vibration is very easy to feel when touching the area around the hot end, but not when feeling the rail itself. It doesn't appear to have an impact on print quality. [youtu.be] The rails are Chinese equivalents, sorced from the reccomended Voron BOM vendor. I stripped, cleaned, replaced bearings and regreased the rails/carriages prior to using them and they ran smoothly. Having previosly deciding it must be the bearing iteself, i purchased another from a different supplier, but it still exhibits the same problem. Things i have done/tried so far: - strip, clean and regrease rails. check consistent bearing size, greased with superlube. - Swap the the x and a y rail + cariage - check all fasteners - Cold run of the printer with no hot end/fans etc. - alter print speeds. I'm running a Duet 2 Wifi with (i think) average jerk and accelerration settings (800mm/min, 2000mm/s^2). I believe it's a mechanical issue rather than settings. Does anyone have further suggestions or experince? Or am I out of luck using these Chinese rails? Thanks https://reprap.org/forum/read.php?1,871065,871065#msg-871065 Mon, 16 Mar 2026 11:28:48 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,871065,871701#msg-871701 https://reprap.org/forum/read.php?1,871065,871701#msg-871701 The fact that your bearings sound and feel fine when you operate them by hand suggests that it is a stepper issue.]]> cahlfors General Wed, 29 Apr 2020 15:26:40 -0400 https://reprap.org/forum/read.php?1,871065,871146#msg-871146 https://reprap.org/forum/read.php?1,871065,871146#msg-871146
Motors are at 1200mA ~80%.

I have been considering better rails, but being in the UK makes it a bit more difficult. Do you have experince with Misumi products? Hard to get here but have read they're good value/quality.
As I understand the rails and blocks are made for one another, so no i haven't considered them seperately.

I've seen other settups that run quite quietly on the Chinese rails. I understand they're generally poor quality, but i hoped there was somthing I was missing to solve the annoyance.

I haven't come across anyone who thinks they can get away with no lube. I like to think i know better than that anyway.]]> Nachomachoman General Mon, 20 Apr 2020 09:51:32 -0400 https://reprap.org/forum/read.php?1,871065,871130#msg-871130 https://reprap.org/forum/read.php?1,871065,871130#msg-871130
I have seen these guys on youtube who replace the undersized balls with better one. Just that they degrease everything, assemble then show how well the parts move freely ! These are JERKS who have NO clue in mechanic ! You NEVER do that, ALWAYS lubricate BEFORE.

Better spend your time learning from professional documents than from these youtube engineers.]]> MKSA General Mon, 20 Apr 2020 08:16:53 -0400 https://reprap.org/forum/read.php?1,871065,871127#msg-871127 https://reprap.org/forum/read.php?1,871065,871127#msg-871127
Check the motor current- should be around 80% of rated current or less.

Move everything around manually with and without belts and see if you can get it to make that noise.

I'd probably start looking for some new, high quality linear guides. Here's something to keep in mind when you're shopping: forget what some idiot posted on reddit. If you have to take it apart and replace the balls before you use it, it isn't a quality linear guide. If you're lucky enough to get it to work at all, it isn't likely to work for long..
Look for NSK, IKO, THK, NB guides. If you are patient you will find a good deal on used or new-old-stock guides for little more than the cost of the crappy HiWin knockoffs (they have part numbers that start with "MGN and MGH"). The main spec you need to be worried about is the length of the rail and number of bearing blocks that the guide comes with. You can cut the rail to the length needed with a cutoff wheel on a grinder. Don't attempt to buy rails and bearing blocks separately.

Here's a deal: [www.ebay.com]
and here's the manual with specs: [www.ikont.com]

Search for terms like " Linear guide THK -MGN -MGH"]]> the_digital_dentist General Mon, 20 Apr 2020 07:41:20 -0400 https://reprap.org/forum/read.php?1,871065,871124#msg-871124 https://reprap.org/forum/read.php?1,871065,871124#msg-871124 Nachomachoman General Mon, 20 Apr 2020 05:24:21 -0400 https://reprap.org/forum/read.php?1,871065,871078#msg-871078 https://reprap.org/forum/read.php?1,871065,871078#msg-871078 the_digital_dentist General Sun, 19 Apr 2020 11:29:30 -0400 https://reprap.org/forum/read.php?1,871065,871068#msg-871068 https://reprap.org/forum/read.php?1,871065,871068#msg-871068 The ones running smoothly are made with recycled Soviet era nuclear submarines. They are better just a bit radioactive.
So you are lucky.
Note they can be recycled as Lychees cans.

How much for your Duet ?]]> MKSA General Sun, 19 Apr 2020 08:26:43 -0400 https://reprap.org/forum/read.php?1,871065,871065#msg-871065 https://reprap.org/forum/read.php?1,871065,871065#msg-871065
I have a self built D-bot with a good few modifications including linear rails.
I'm having great difficulty in identifying and solving a serious vibration/noise seemingly coming from the X-axis. See attached video.
The vibration is very easy to feel when touching the area around the hot end, but not when feeling the rail itself. It doesn't appear to have an impact on print quality.

[youtu.be]

The rails are Chinese equivalents, sorced from the reccomended Voron BOM vendor. I stripped, cleaned, replaced bearings and regreased the rails/carriages prior to using them and they ran smoothly.
Having previosly deciding it must be the bearing iteself, i purchased another from a different supplier, but it still exhibits the same problem.

Things i have done/tried so far:
- strip, clean and regrease rails. check consistent bearing size, greased with superlube.
- Swap the the x and a y rail + cariage
- check all fasteners
- Cold run of the printer with no hot end/fans etc.
- alter print speeds.

I'm running a Duet 2 Wifi with (i think) average jerk and accelerration settings (800mm/min, 2000mm/s^2).
I believe it's a mechanical issue rather than settings.

Does anyone have further suggestions or experince? Or am I out of luck using these Chinese rails?

Thanks]]> Nachomachoman General Sun, 19 Apr 2020 08:14:28 -0400