Bed Compensation ruins first layer Hi everyone. I've been printing without using the automatic bed levelling without issue. I decided to implement the auto bed compensation and it ruins my first layer. It looks like cottage cheese. Without compensation the first layer it is near perfect, even on large objects. I've checked all the probe locations and can't see any issue. I was really just interested to know what people think is the likely cause of this? https://reprap.org/forum/read.php?340,672422,672422#msg-672422 Fri, 10 Jul 2026 22:15:19 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?340,672422,674237#msg-674237 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,674237#msg-674237 The most important thing is that the surface is even of course.]]> Treito Ormerod Tue, 14 Jun 2016 08:19:17 -0400 https://reprap.org/forum/read.php?340,672422,674216#msg-674216 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,674216#msg-674216
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Treito
Why not?

Think about an extreme situation where the bed is bowl-shaped with a big dip in the middle. Bed compensation will result in the nozzle dipping in the middle of the print and rising at the edges. This will continue to be the case layer by layer and so the top surface of the print will follow the shape of the bed and also have a bowl-shaped depression in the middle.

Dave]]> dmould Ormerod Tue, 14 Jun 2016 07:02:56 -0400 https://reprap.org/forum/read.php?340,672422,674030#msg-674030 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,674030#msg-674030 Treito Ormerod Mon, 13 Jun 2016 11:43:28 -0400 https://reprap.org/forum/read.php?340,672422,673995#msg-673995 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673995#msg-673995
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Treito
Originally my Ormerod 1 had a height difference of more than 1mm which I wasn't able to remove. Why I am telling this? To make you one thing clear: If you put such a feature into your firmware the dimensions will not be accurate.

They won't be accurate with normal bed compensation either - think about it.

Dave]]> dmould Ormerod Mon, 13 Jun 2016 10:29:01 -0400 https://reprap.org/forum/read.php?340,672422,673955#msg-673955 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673955#msg-673955 Treito Ormerod Mon, 13 Jun 2016 08:06:31 -0400 https://reprap.org/forum/read.php?340,672422,673948#msg-673948 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673948#msg-673948
Dave]]> dmould Ormerod Mon, 13 Jun 2016 07:47:00 -0400 https://reprap.org/forum/read.php?340,672422,673812#msg-673812 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673812#msg-673812 Treito Ormerod Sun, 12 Jun 2016 19:01:17 -0400 https://reprap.org/forum/read.php?340,672422,673543#msg-673543 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673543#msg-673543 dc42 Ormerod Sat, 11 Jun 2016 18:02:12 -0400 https://reprap.org/forum/read.php?340,672422,673535#msg-673535 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673535#msg-673535 RoboPicker Ormerod Sat, 11 Jun 2016 17:23:14 -0400 https://reprap.org/forum/read.php?340,672422,673332#msg-673332 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673332#msg-673332
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RoboPicker
Hey Guys,

Exactly the same issue here. I've leveled the bed and can print well without auto bed leveling. However once I turn on the 5 point leveling things get pretty bad, can see the Z axis winding up and down even though I know the bed is flat.

Is anyone else here using this function with success? Using the upgraded differential IR sensor and version 1.13b btw.

How you want to know that your bed is flat?
Like dc42 said it is not important that it is angled to the z-axis. The distance between the nozzle and the bed is the thing. Using Firmware 1.12a-dc42 with the mini-height-sensor and PrintBite works perfect. With FilaPrint I have small issues, but it seems that meanwhile there is a bigger problem with my Ormerod 1 - again.]]> Treito Ormerod Sat, 11 Jun 2016 05:21:19 -0400 https://reprap.org/forum/read.php?340,672422,673274#msg-673274 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673274#msg-673274 dc42 Ormerod Fri, 10 Jun 2016 22:28:20 -0400 https://reprap.org/forum/read.php?340,672422,673272#msg-673272 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,673272#msg-673272
Exactly the same issue here. I've leveled the bed and can print well without auto bed leveling. However once I turn on the 5 point leveling things get pretty bad, can see the Z axis winding up and down even though I know the bed is flat.

Is anyone else here using this function with success? Using the upgraded differential IR sensor and version 1.13b btw.]]> RoboPicker Ormerod Fri, 10 Jun 2016 21:58:35 -0400 https://reprap.org/forum/read.php?340,672422,672965#msg-672965 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672965#msg-672965 jsv555 Ormerod Fri, 10 Jun 2016 03:33:51 -0400 https://reprap.org/forum/read.php?340,672422,672945#msg-672945 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672945#msg-672945
For me the paper method never worked. From my time using BuildTak (and also using FilaPrint) the suggested procedure is the following: Start at a higher nozzle distance. Than slowly change the value of the sensor and re-home the z-axis until you get the filament to stick.

For several print surfaces the paper method is not allowed: BuildTak, FilaPrint and I guess PEI also. Kapton tape is also a problem. If you are a little bit too deep the tape will be destroyed. It seems like you are in the grey zone where the tape can survive, but if you look at one hole it looks like the Kapton tape has already gone.]]> Treito Ormerod Fri, 10 Jun 2016 02:02:44 -0400 https://reprap.org/forum/read.php?340,672422,672829#msg-672829 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672829#msg-672829 Darathy Ormerod Thu, 09 Jun 2016 16:06:21 -0400 https://reprap.org/forum/read.php?340,672422,672686#msg-672686 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672686#msg-672686
The only photo I have at the minute is this first layer test I did the other day to check the bed was level. It is a 100mm dia circle with another circle within it.
[attachment 79514 BEDCOMPTEST.JPG]
This is using the bed compensation. As you can see there are gaps in the infill and holes all over the place. Without the bed compensation this was near perfect (typically I didn't photo this).
I don't think light level is the issue as this was done at night with indirect lighting to the room. I did wonder whether there was dirt etc. at a probe site so I replaced the targets and Kapton tape. I get similar results whenever I apply the bed compensation. Without it is spot on.
As you say I can just not use the auto bed levelling. I just can't figure out what is going on.]]> jsv555 Ormerod Thu, 09 Jun 2016 09:26:25 -0400 https://reprap.org/forum/read.php?340,672422,672427#msg-672427 Re: Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672427#msg-672427 Darathy Ormerod Wed, 08 Jun 2016 13:44:19 -0400 https://reprap.org/forum/read.php?340,672422,672422#msg-672422 Bed Compensation ruins first layer https://reprap.org/forum/read.php?340,672422,672422#msg-672422 I've been printing without using the automatic bed levelling without issue. I decided to implement the auto bed compensation and it ruins my first layer. It looks like cottage cheese. Without compensation the first layer it is near perfect, even on large objects.
I've checked all the probe locations and can't see any issue.
I was really just interested to know what people think is the likely cause of this?]]> jsv555 Ormerod Wed, 08 Jun 2016 13:20:31 -0400