Re: Help wanted - Duplex printing

Thanks Pierre and MRAB.
I tried that; here is a hex dump of my concatenated file:


16:09:12 R:\DSPR>dump ShortDocument3.txt
File ShortDocument3.txt Size 60 (hex 3C) bytes
00000000:  54 68 69 73 20 69 73 20 74 68 65 20 66 69 72 73  |This is the 
firs|
00000010:  74 20 64 6F 63 75 6D 65 6E 74 2E 0D 0A 0C 54 68  |t 
document...♀Th|
00000020:  69 73 20 69 73 20 74 68 65 20 73 65 63 6F 6E 64  |is is the 
second|
00000030:  20 64 6F 63 75 6D 65 6E 74 2E 0D 0A              | 
document...    |


but no dice; it printed the whole thing on one sheet, with the form feed 
printed as a
thick-headed up-arrow character at the start of the second line.
It's looking as if it will only switch sides when the first side is full.
Best wishes
Rob Cliffe


On 27/08/2026 15:42, MRAB wrote:
> On 27/08/2026 13:08, Rob Cliffe via Python-list wrote:
>> I have a Windows 11 laptop and an Epson WF-4820 printer.
>> Is there any way I can programmatically print two files, one on each 
>> side of the same sheet of paper?
>> The following program doesn't quite work (Python 3.13.3):
>>
> [snip]
>> What happens:
>> It prints the first file on one side of a sheet, then sucks the sheet 
>> back in and prints nothing on the other side.
>> (Nothing, because the document is short and fits on one side).
>> Then ejects the paper.
>> Then does the same thing with the other file.
>> In other words each file is printed (separately) in duplex mode,
>> but they are not printed on the same sheet.
>>
>> If what I want is possible (from my research so far I'm  getting the 
>> impression that it isn't)
>> can I do the same thing with image files (print two on opposite sides 
>> of the same sheet) ? 
> If they are both plain text files, you could try concatenating them 
> into one file with a Form Feed character (chr(12) or "\f") between 
> them and then print that.

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