Cannot print anymore since upgrade to Macos 10.13.6

I was using Macos 10.13.4.

When I upgraded to Macos 10.13.6, I noticed my print jobs got stuck in the print queue so I deleted those print jobs and then I installed a newer version of the printer driver from Ricoh: http://support.ricoh.com/bb/html/dr_ut_e/rc3/model/mpc3004ex/mpc3004ex.htm

and I recreated a new printer called Test1.

Now, I can print some small pdf files but I cannot print this 45 page pdf file: https://eprint.iacr.org/2018/053.pdf because the print job is stuck from half an hour :

Cups says this on http://localhost:631/printers/Test1 :

Test1-536   Unknown     Withheld    3550k   Unknown     processing since
Fri Jul 27 13:17:17 2018 
"Copying print data."

$ lpr -P Test1 053.pdf
$ lpq -P Test1 +2
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
....

Can you help me ?

EDIT1 : Cups WebInterface is enabled

EDIT2 : The job is stuck for half an hour :

$ time lpq -P Test1 +2
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 536     053.pdf                         3635200 bytes
....
Test1 is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  mansfel 538     053.pdf                         3635200 bytes
Test1 is ready and printing
lpq: Undefined error: 0

real    29m4.571s
user    0m4.278s
sys     0m4.707s

EDIT3 : Test1 is connected to a Ricoh MP C3004ex printer via the lpd protocol.

EDIT4 : Cups GUI (http://localhost:631/) listens to the ipp port but not the printer server (x.y.z.t) :

$ netcat -v -z -w 5 x.y.z.t 631
islande [x.y.z.t] 631 (ipp): Operation timed out

The printer server (x.y.z.t) listens on the LPD port :

$ netcat -v -z -w 5 x.y.z.t 515
islande [x.y.z.t] 515 (printer) open

EDIT5: I need to check my loptions, but I cannot do this because I don't have the MacBook anymore as my internship is finished.