I’m sure you did several tests to troubleshoot your problem but for my better understanding and 4+ eyes principle:
The skewing/slant is from the XY plane up on Z direction only towards X when checking with both XY surfaces (build platform and top) or only if the build platform side surface is used as reference?
I think your expectations of FDM technology may be a bit too high. The best specs I’ve seen for consumer level devices was ±0.1mm. And even then, that was estimates by third part measurement. I tried to find out if Bambu or even Prusa published a tolerance spec and I wasn’t able to find anything definitive. Even the revered resin printers only have a tolerance of 0.01mm and those are speced-out and that’s only for commercial grade printers. Keep in mind, you bought a consumer appliance and keep that in the back of your mind when trying to print with precision.
or only if the build platform side surface is used as reference?
I use only build plate surface as a reference when the print sits still in the printer, and any flat horizontal surface when measured for example on the table. Top of my desk is pretty flat and straight.
Should I measure it in relation to printer’s frame?
Hi,
Thanks for your feedback, but this is not the case. As you probably know, clearances of 0.2mm cannot be seen with naked eye. Deviations in my prints can be seen easily. Maybe it is not so clear in the pictures, but in reality it’s obvious. Deviation from vertical at the top of 50mm high calibration cube is +1mm. Have a look at the gap in the attached picture. So I don’t expect high dimensional accuracy, just decent normal look of straight parts
I have seen many prints done on cheap Enders which were way more “vertical” than mine. So I guess I can complain a bit.
Measure the perpendicularity of the top face (oposite to the build platform face) to the sides of your print, should be square there to all side faces on a core XY printer like the P/X 1 but just to be sure.
Did you ever do a manual bed tramming after your bed replacement?
Hmmm well if the top and bottom are parallel than that’s good.
Your outer walls look pretty rough with varying layer shifts, what speed setting and layer height are you using to print these towers?
LOL well even standard Bambu profiles without calibration are usually better than that unless you run very high speeds.
It is a curious problem where as of now I can see two possible root causes:
-one the z axis is physically traveling non perpendicular in relation to the printer head X axis, now there can be some differences in manufacturing but if your measurements with 1mm skew over 50mm is correct then that is way too much.
Accurately verifying that directly on the machine will be rather difficult with conventional means.
-second a miscalculated/over- or under compensating software/firmware based skew correction or bug thereof. Now this is purely an assumption of mine and also difficult to check for since you would require to see/measure the true x axis position of the head at different Z heights in relation to vertical part wall reference line.
Thanks mate! You made me think about it and I figured out how to check it. I’ve just simply verified perpendicularity between bed and Z linear guides, and it’s waaaay off.
sure the build platform in relation to the Z direction guide rods is the easy one to check but what is the difficult one is where do the print head X direction carbon guide rods sit in relation to these steel Z guide rods.
True, but it can be done indirectly.
I’ve just quickly checked bed and X carbon rods with spirit level. And they’re both more or less level, as far as one can tell just looking at the bubble.
Nevertheless, is there any way to correct position of Z-axis guides? It seems like the top mounting points are permanently welded, or is it possible to use these screws?
I’ve had a closer look at the printer when I got back home, and I can say that such an adjustment is unfortunately impossible. Top plastic mounts are “welded” with the frame.
If the Z-axis guides and screw drives are truly non perpendicular to the X-Axis rods then would say it can only be fixed with a skew correction inside the firmware but to my knowledge that’s not accessible to us on this closed system and with the assumed large hardware deviation this “software” correction may create some other print quality issues.
did you hear anything back from Support?
No, software correction at this level is not possible. Deviation is really big.
Have a look at this mark and hole (which I think are positioning marks and assembly aid), there are way off their centre. Also the slot hole in the frame is visible. This means that the whole top mount is in its extreme “left” position.
For me it’s obvious that the printer has a technical defect present from the very first day after leaving factory.
Regarding the support - it’s a joke.
I waited two weeks, described all the issues with printer’s misalignment, provided dozen of photos and videos. And I got generic “response” about tensioning the belts, levelling bed and calibrating. If the issue persists I should provide 3mf file for analysis.
I’m feeling like I’m being treated like an idiot now.
