What is the *real* maximum print volume?

While I understand that my answer below does not directly address the OP’s question, this is where a Google search led me when I queried the post’s title question, and the answer I sought is provided below. I hope this helps others who find themselves in the same position I was in six months ago.

If you prefer to keep your printer unaltered as it is when unpacked after delivery, and you’re not interested in following the wiki’s steps for achieving the “full” advertised print size or altering the flow lines area, I recommend designing your models to fit these dimensions:

  • X: 255
  • Y: 225
  • Z: 250

As shown in the screenshot, you still have a little play in the front before impacting the flow lines (if your design isn’t cube-ish).

When I started my journey in 3D printing with no prior experience, I had just purchased my first printer (X1C). This was the kind of information I was eager to find online. Although I still see myself as a novice in this hobby, creating designs within these build plate dimensions has been effective for me so far, and I know that if the need arises, I can make the wiki adjustments to utilize the entire print bed.

It seems printer is limited to just under 254mm printable height, with 0.4 nozzle and double-sided smooth high temp PEI plate.
At 254mm the build plate hits the bottom of the printer and hotend start dragging on the part.

My settings were:
Printable height = 256
Z hop upper boundary = 255
Z hop when retract = 0.4 (in both printer settings and in filament)

Printed part was 254mm high.
With 0.2mm profile my part got mangled at 253mm because z-hop was still active and z-axis hit the bottom of the printer. The toolhead pulled the print off the plate and got wedged in it, totally make itself immobile, good think I was there to yank it out the printer.

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I think the 256mm is correct. In my case I have z-axis screw dust protecting covers, they seem to be the reason why my tests maxed out at 253mm

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Can I just say that i am frustrated by this. I spent hours modeling to a height of 254, because it is 2mm under the total volume and now I cant print. I can’t orient my object another way, I specifically designed it to be printed with no supports. I am not into modifying my printer, I would probably screw it up beyond usage. A max of 249 is a SIGNIFICANT difference from 256. If Bambu advertises 256 you should be able to print 256 straight out of the box! Thank you to everyone that added to this thread.