D11_H Bug when printing - unpack requires a buffer of 4 bytes.

[Adrian-Grimm]

I've the D11_H version with 300dpi and when I print I get the error message:

unpack requires a buffer of 4 bytes.

Print output is then just a empty label with nothing printed on it.

[fraro]

Have you found a solution for this? I'm thinking about buying a D11_H, but using the original software is a no-go.

Did you try setting the dpi to 300 in the code (AppConfig.py) ?
Where in the code does this error happen?

[oeloo]

I am also interested in buying a D11_H because it has 300dpi resolution. Thanks for sharing, this bug is stopping me from buying it. Hope it can be fixed.

[olefrerichs]

Same error with D110-M 2024 on mac os 15.0

[oeloo]

According to the thread mentioned by @fraro , to solve the problem for D110-M 2024 and D11_H is to modify the line 7 of NiimPrintX/NiimPrintX/ui/AppConfig.py :
self.print_dpi = 300 # DPI value for printing
instead of:
self.print_dpi = 203 # DPI value for printing
because these 2 devices print at 300 DPI whereas the former ones were only printing at 203 DPI.

[olefrerichs]

Thanks for your answer, I tried to change the line, but sadly with the same result. I don't have to compile anything, right? Just relaunch the UI app?

[oeloo]

As the code is 100% Python, no compilation is needed.
There is an other modification that makes sense to do in addition on NiimPrintX/NiimPrintX/ui/AppConfig.py :

• modify this
  self.label_sizes = { "d110": { "size": { "30mm x 15mm": (30, 15), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "d11": { "size": { "30mm x 14mm": (30, 14), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "d101": { "size": { "30mm x 14mm": (30, 14), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "b18": { "size": { "40mm x 14mm": (40, 14), "50mm x 14mm": (50, 14), "120mm x 14mm": (120, 14), }, "density": 3 } }
• to this:
  self.label_sizes = { "d110_m": { "size": { "30mm x 15mm": (30, 15), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "d11_h": { "size": { "30mm x 14mm": (30, 14), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "d101": { "size": { "30mm x 14mm": (30, 14), "40mm x 12mm": (40, 12), "50mm x 14mm": (50, 14), "75mm x 12mm": (75, 12), "109mm x 12.5mm": (109, 12.5), }, "density": 3 }, "b18": { "size": { "40mm x 14mm": (40, 14), "50mm x 14mm": (50, 14), "120mm x 14mm": (120, 14), }, "density": 3 } }

If it does not work with a '_', try with a dash instead '-'.

[olefrerichs]

Thank you for your answer!

I tried your change, then the application won't start at all with error in terminal "KeyError: 'd110'". I guess "d110" is the default at load, so I added underneath it the block for "d110_m". Then it starts, I can choose "D110_M", printer connects. Printing still doesn't work, but now sometimes "unpack requires a buffer of 4 bytes." or new: no error is shown. Just after some timeout (60s or so) the message "disconnected" pops up, Status at the bottom of the main window remains green "connected". I also tried with "d110-m", but then the printer can't be found/connected after startup.

Can I output some kind of log to give you further details?

[oeloo]

I confirm d110 is the default to load:
@click.option( "-m", "--model", type=click.Choice(["b1", "b18", "b21", "d11", "d110"], False), default="d110", show_default=True, help="Niimbot printer model", ) in NiimPrintX/cli/command.py
Add the "d110_m" and "d11_h" to this list

[olefrerichs]

Sadly still "unpack requires a buffer of 4 bytes." after some timeout when I click print. Connects to printer, everything seems fine, but the printer just moves out an empty label and the error appears on screen.

[oeloo]

So, the new Niimbot printer 300 dpi feature requires more advanced knowledge of how this application works. @labbots definitely needs a new 300 dpi Niimbot printer 🙂