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The download queue is too long  

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Coviello
(@coviello)
Member
The download queue is too long

I have been using Prusa Connect happily for some time but now I cannot send anything to the printer as I get the message

"Error uploading to print host:  HTTP 400: {"message": "The download queue is too long", "code": "DOWNLOAD_QUEUE_TOO_LONG"}"

What do I need to do to rectify this?

Posted : 08/08/2025 9:29 am
SteveS
(@steves-6)
Member
RE: The download queue is too long

I just started having this problem about a week ago as well.  I've cleared queues, rebooted my Prusa XL and PC and the problem persists.

Posted : 15/08/2025 7:38 pm
tdk408
(@tdk408)
Estimable Member
Bogus PrusaConnect error: download queue is too long

There is nothing in my download queue, yet the error persists.

I found the solution. The error is in the error message itself.  

I went to PrusaConnect (within PrusaSlicer), opened up the print history, and deleted 5 or 6 print jobs that did not complete successfully.

Why did 6 small print jobs wedge my upload, and why was the error so unhelpful? 

I'm an extremely pleased Josef Prusa fan of five years and thousands of excellent prints, but this shouldn't have been so hard to diagnose.

Cheers,

Tom

Posted : 28/08/2025 7:14 pm
Klaus Yde
(@klaus-yde)
Member
RE: The download queue is too long

I have just removed all mine failed prints - it didnt help. I still get the same error. 🤔

Posted : 08/09/2025 1:09 pm
Bassmando
(@bassmando)
Active Member
RE: The download queue is too long

It worked!  Thanks!!

Posted : 05/10/2025 2:11 am
dognaught47
(@dognaught47)
Member
RE:

I was experiencing a similar issue in PrusaSlicer 2.9.3

I'm not really sure what the root cause is here, but here's how I fixed it:

  • In PrusaSlicer navigate to: PrusaConnect->Dashboard 
  • I noticed that toward the bottom, under "Current transfers" there were many entries present with messages like "The file with this name is already present on the printer" or "Waiting for uploading to printer...". I clicked "Stopped Transfer" (and then confirmed "Delete transfer" for a bunch of these entries and that seemed to solve the problem

I don't know if this is related, but at some point I swapped my USB drive for a new one. I also removed all the files from the USB drive while troubleshooting. I also had a bunch of files that seemed to have the same name, probably because I'm lazy about saving out new projects for each transfer. 

This post was modified 19 hours ago by dognaught47
Posted : 14/10/2025 2:24 pm
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