Saturn 4 Ultra Z et Ultra 16K -Limit flash for Wham Bam XTR

I decided to give up with magnetic build plates on my saturn 4 ultra, I was having really bad bed adhesion, and the plate would shift with large models.

After I took the plate off the printer, I tried to restore defaults using the second file in the downloads here, but it didn't work, and the printer would fail to auto-level on every print (and the print would fail if I did mandatory printing)

ended up having to get another G-code file from Elegoo support, which fixed the issues.

Im trying to send the file to my S4U but I keep getting a Format Mismatch and greyed out printer, cant send it

Hello, I have a Saturn 4 Ultra and it is not recognizing the Gcode file. There is no Z spacer files on your site as well. Please support

Please update this G-code. I've conducted multiple tests with/without this patch on multiple printers, where after leveling the build plate exerts too much pressure and causes the tilting vat to click and force itself into it as it returns to process the next layer. I've tried running this modified build plate without the patch as well and I get foreign object errors caused by the plate itself (which I know the patch partially resolves). I've spoken with Wham Bam technical support but they've stopped returning my emails about this issue.

Alright I was able to get the build plate leveled and printing great post forced update. I wanted to give my (hopefully) future proofed solution.

1) I updated to the mostrecent firmware then installed the patch (Last update 2025-04-16 at 15:10 as of the time of writing). I do not know if the patch is necessary, but it didn't hurt.
2) Wham Bam gave official approval to manually level the build plate, so I followed this tutorial to do so (IMPORTANT NOTE: In the video, he recommends loosening the screws 180 degrees. Given the extra thicccness of the magnetic plate I did closer to 2.5 full rotations. I may even recommend just doing 3 full rotations): https://www.youtube.com/watch?v=nvUwhhyUJ5U
3) Hopefully that is all you need to do and you are off to the races, but if you have any further issues I also scuffed up one side of my flexi plate for additional surface area. I had done this before getting official word from Wham Bam that we can manually level the build plate safely, and probably isn't necessary. I haven't tested the smooth side yet.

I was able to print the provided ROOK benchmark beautifully, so your slicer settings shouldn't change much if at all compared to what they were previously. If you have issues, maybe consider raising your exposure times... but I would do that as a last resort.

Finally a note for people who haven't installed the magnetic plate yet/are considering buying. I spent a while sanding down the stock build plate before putting on the adhesive magnet. I had heard reports on this printer shipping with taco shaped build plates and, tbh, mine looked fine, but I wasn't taking any chances. Just something to consider for piece of mind that your build plate is starting from flat foundation before attempting to level.

Good Luck! I would still recommend this upgrade, just took some more time & elbow grease to install than I originally expected. Hopefully this comment significantly cuts down on the time!

What happened to the FBSR version?

When is the new update for the patch gonna come out? At least document what we need to change so we can change the GCODE ourselves.

My saturn 4 ultra got a new firmware update, i tried this file again and printed a test rook, did not even print on the build plate, i think that the z offset is messed up in the file

Seems elegoo pushed out a forced/unskippable update. I reached out via email as well to check on an update to this file.

Patch worked great, had never updated my saturn 4 ultra before, plugged in the flash, patched, and fired up a print. Printed perfectly, however there was a single layer of the raft, maybe the 5-6th layer, that printed something like 80 degrees off center. This was the only issue and didn't cause any sticking or anything, just very strange. Going to throw a larger print on now and see if the issues repeats. Thanks for all the hard work in making these patches!

Please update gcode, there is new firmware update for S4U16

How do I remove the patch, and go back to the original settings?

So I've got the 1.3.4 firmware and when I try the latest wham bam patch, it's not going down far enough to print anything. Constant failed prints trying to diagnose but it's becoming clear it's the wham bam patch. Is there any news when it'll be updated to work with 1.3.4?

Printer: 16k
Firmware is up to date as of the time of writing

After Applying the patch & sanding the flexi plate as instructed (which succeeded in giving me much better adhesion) I am consistently getting flexi plate shifting during the base layers. Your install video says to manually level the bed to resolve this issue but your instructions on this patch warn not to do that. What is wham bam's official advice or is a new patch in the works to resolve this issue?

Thank you.

I can't get consistent results, I've had to almost double my bottom exposure time to have anything stick most of the time, I still just the FEP covered in parts. Pretty close to just taking it off after a week of messing around...

Isn`t working with my Saturn 4 Ultra. The buildplate is way too much away from the screen. Tried it 3 times and always failed to get a print done. Going back to stock...

I have a problem with the leveling after installing the firmware flash.

• The first time the plate pushed too far and the print shifted.

• Eventually everything back to default and did the flash again.
  Then I got the error that something was in the way. Choose mandatory printing.
  But then again no good print.

*Now everything back to factory settings. From there firmware fully updated, then the latest firmware flash.

The problem now is that there is nothing on the plate, only a thin layer in the resin tank.

So how do I get the plate lower at start printing?

Just opened my Saturn 4 Ultra. The machine updated the firmware on setup to rev 1.3.1.
Downloaded and printed/installed the firmware update from cults. Rebooted the machine as directed.
Go to run my calibration test prints and i get a foreign debris error message. What is the solution Wham Bam?

Had my printer 9 months now and all was ok with the WhamBam plate, did the last firmware update and flashed with the latest Whambam firmware and had the foreign debris message, clicked mandatory print and the printer tried to push the plate down so that the screws were raised about the thickness of the flexplate, so I stopped the print. I went back to my previous firmware which I had backed up and ran a successful print with no issue, 15 of 15 parts, I turned the printer on this morning and go to print the same file and get the foreign debris message again, clicked mandatory print and the print started, however I have had only 6 of the 15 parts successfully print, with no changes to the printer

im having some errors with the distance, is it posible to adjust the code for different heights? sry for my english

I have issues with the levelling.

My firmware is v1.31... I did the firmware flash with the latest gcode.

In my first attempt I did this, I get an error that there is something in the way, but I choose mandatory printing....
the springs are squishing and the first raft layers are thinner then normal but everything was on the plate.

Then I set everything back to default, tried it again with the gcode. I changed the code in line 4 and 5 with a +0.6 and also tried it with a +1.0;
M5000 I4 X31.800000
M5000 I4 Y7.800000
M5000 I204 A48.800000
M5000 I204 B5.400000
M5000 I205 A5.400000
M5000 I205 B2.800000
M5000 I205 E5000
M5000 I206 C20000
M5999 I0

But then nothing was on the plate, it was on the fep.

I reset everything back tot the original firmware. flashed again with the gcode, and then I did a manual leveling.
The papers are slightly moving after some adjustment....

Then the new attempt of printing.... I get the error again that there is something... I choose mandatory printing...
It looks good, it sounds good, You dont see or hear squishing springs... Only the print is releasing of the fep.

But everything in the middle has failed... only the items on the sides are good,

I am now out of ideas what I can do.... Somebody have some ideas?

Hey everyone, sorry that I don't hop on here as much as I should. I do prefer to work directly with folks who are experiencing issues. So, if you are experiencing any issues that relate to "foreign object detected" errors or any "squish" on the base layers of prints, please feel free to reach out to me directly and I'll be more then happy to work with you "one on one". My email is mattinflorence@yahoo.com and please use WhamBam as the subject. For anyone that I've worked with and the issue has been resolved, can you please update your posts here, thanks :)

It worked perfectly on my Saturn Ultra 4, but yesterday I installed the new elegoo update. I uploaded the latest gcode (2025-03-03 13:56) but the prints doesn`t fails. The printed models stick in the resin tank. I also tried to install an older version from the gcode (october 2024)
Do you have any recommendation?

Has there been another elegoo update? Having problems when this version (2025-03-03 at 13:56) is applied . I chose to print anyway despite the error and it looked like the plate compressed about the thickness of the magnet and flex plate.

I just installed onto my Saturn 4 Ultra 16k and its working perfectly!

I recently installed this onto my Saturn 4 ultra and I like the rest keep getting the "foreign debris" message.

I saw you updated the code again and just ran the new gcode today and it still gives that message.

I decided to do "mandatory printing" and watched as it printed the first layer. When it went to print the 2nd layer I heard a slight "crunch" sound and canceled my print. I am worried of this damaging my printers screen or vat.

I've been using this for months now, but figured i should probably update it considering that i probably have had firmware updates since it was installed. I installed the update without issue, but now when i start a print it will always say "foreign object detected". I can click "mandatory printing" and it prints fine after that, but is there anything i should be doing to remove that initial error? I never did another manual level since it seemed to work fine otherwise. Should i do that? are there any instructions on how to do it on a saturn 4 ultra? I remember seeing a video or instructions when i got the flexi plate, but i don't know where it was and would just like some refresher on how its done properly.

the instructions keep talking about flashing firmware, but there is no firmware file to download all That I see are 3 Gcode files is that what you mean by firmware? i dont think so,

I believe I have found a solution to the ultra thick rafts. The issue is not the gcode, I have never updated it since 16/10/24 and I had the ultra thick rafts happen to me. I believe the issue is the 'auto level' specifically the springs; the bed has to push through the resin to get into position but for the first few layers its thick enough and there is enough of it to give resistance to the bed springs meaning when the curing light turns on the bed is not yet in position. This can be minimized by printing thin rafts with gap patterns and by printing fewer things spread out but The proper solution is to add a delay to the curing light so that the bed can catch up and let the resin settle. Unfortunatley chitubox doesn't allow this for specifically the base layers and im not sure about lychee.

The way I've been doing it is to slice in chitubox then taking the sliced file and editing in uvtools; once in the application click the 'tools' drop down then 'edit print paramaters' check the box that says 'change settings per a layer range' then uncheck 'synchronize' you can then select the from and to amounts that you desire. I have been doing until slightly after my raft is printed (which is very thin so doesnt increase the times drastically) im not sure that its need for all of those but I'm playing it safe. To change the delay itself you need to change the 'Wait before cure:' setting to your desired time, for me thats 10 seconds but again that might be overkill. Since making this change, I have done 3 prints all without thick rafts and the last was a very full build plate.

Right, I wanted to write a comment about using the XTR Flexplate on the Elegoo Saturn 4 Ultra. I feel the instructions given are poorly written and don’t actually work. You shouldn’t have to read through comments on a download page and try to debug these issues independently, but here we are. This should all be thoroughly explained when purchasing the product. There should be a video guide on setting this up or at least a well-constructed manual, not just a separate website link in the description of a download.

Device Info:
System Version - EL3D-4.0
Firmware Version - V1.2.8-LCDC/11520*5120/V41.28
AI Camera Firmware Version - 1.1.14

My first attempt went like this:

Downloaded Wham Bam XTR 011525 - Elegoo Saturn 4 Ultra.gcode
(This is what is inside the file)
M5000 I4 X32.000000 ;Max line in the actual resin detection stage (default 28mm)
M5000 I4 Y8.000000 ;Min line in the actual resin detection stage (default 4mm)
M5000 I204 A49.000000 ;The resin detection starting position (default 45mm)
M5000 I204 B5.000000 ;Set value to thickness of magnetic plate system + 1 (default 1mm)
M5000 I205 A5.000000 ;Set value to thickness of magnetic plate system + 1 (default 1mm)
M5000 I205 B3.000000 ;Set value to thickness of magnetic plate system - 1 (default -1mm)
M5999 I0

Put the file on a USB and plugged it into the printer.

Power cycled the printer.

Pressed Print > Selected Wham Bam XTR 011525 - Elegoo Saturn 4 Ultra.gcode > Pressed print.

The loading bar appeared and completed very quickly.

A message appeared saying the printer should be restarted.

I power cycled the printer again.

Attempted a print, but a message appeared: "Auto-leveling failed, please troubleshoot."

Went to Settings > Accessibility Features > Manual Leveling.

During manual leveling, a graph appeared showing pressure against distance.

The graph plotted and started increasing in pressure around 1.5, but then failed.

I went back to my computer and edited Wham Bam XTR 011525 - Elegoo Saturn 4 Ultra.gcode, adding 1mm to the last two A and B lines as mentioned in the comments.

M5000 I4 X32.000000
M5000 I4 Y8.000000
M5000 I204 A49.000000
M5000 I204 B5.000000
M5000 I205 A6.000000
M5000 I205 B4.000000
M5999 I0

Redid steps 2 to 10.

This time, the graph plotted and started increasing in pressure around 2, but it failed again. I believe what is happening is that the manual leveling took too long to see any pressure difference and assumed something was wrong, aborting the process.

I went back to my computer and edited Wham Bam XTR 011525 - Elegoo Saturn 4 Ultra.gcode again, this time removing 1mm from the last two A and B values.

M5000 I4 X32.000000
M5000 I4 Y8.000000
M5000 I204 A49.000000
M5000 I204 B5.000000
M5000 I205 A4.000000
M5000 I205 B2.000000
M5999 I0

This time, the graph plotted and started increasing in pressure around 0.8. The manual leveling worked. I then tried a 3D print, and it got past the auto-leveling stage and started the first layer.
I think this issue is sorted for me, but I haven’t done any full prints yet, so I still need to confirm if it’s completely fixed. I also ran into an issue where the printer said the resin vat was too full. Luckily, that message went away the next time I tried a print. If anyone has issues with this, maybe changing the first line in the GCODE might help?