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Lots of checksum mismatches lead to Repetier crash

Posted by Stephanel 
Lots of checksum mismatches lead to Repetier crash
February 23, 2015 12:50PM
Hi!

Today I upgraded RepetierHost 1.0.4 to 1.0.6. I have been using 1.0.4 already for months without many problems. However, after upgrading, I wanted to print something, and I got a lot of errors like

18:18:31.338 : Error:checksum mismatch, Last Line: 1338

I thought I had missed these kinds of error before, so it might be that I had them before. I am quite sure I would have noticed though... Now on the other end, these errors eventually lead to a crash of RepetierHost, or it just freezes. That definitely is new. I almost never had any crashes during prints before.

I use baudrate 250000 with Marlin software for a Delta Printer. I printed a simple cylinder, and the first 4 layers gave me these errors:

18:14:13.267 : Error:checksum mismatch, Last Line: 106
18:14:13.267 : Resend: 107
18:14:13.283 : Error:checksum mismatch, Last Line: 106
18:14:13.283 : Resend: 107
18:14:13.298 : Error:No Line Number with checksum, Last Line: 106
18:15:00.647 : Error:checksum mismatch, Last Line: 253
18:15:00.647 : Resend: 254
18:15:22.805 :  Attempt to free unreferenced scalar: SV 0x8cfcb78, Perl interpreter: 0x6059138 during global destruction.
18:15:22.805 :  Attempt to free unreferenced scalar: SV 0x8cfcb18, Perl interpreter: 0x6059138 during global destruction.
18:15:24.884 : Error:checksum mismatch, Last Line: 302
18:15:24.884 : Resend: 303
18:16:16.195 : Error:checksum mismatch, Last Line: 418
18:16:16.195 : Resend: 419
18:16:27.102 : Error:checksum mismatch, Last Line: 507
18:16:27.102 : Resend: 508
18:16:34.424 : Error:checksum mismatch, Last Line: 559
18:16:34.424 : Resend: 560
18:16:47.726 : Error:checksum mismatch, Last Line: 619
18:16:47.726 : Resend: 620
18:17:11.670 : Error:checksum mismatch, Last Line: 731
18:17:11.670 : Resend: 732
18:17:11.701 : Error:checksum mismatch, Last Line: 731
18:17:11.701 : Resend: 732
18:17:12.279 : Error:Line Number is not Last Line Number+1, Last Line: 734
18:17:12.295 : Resend: 735
18:17:14.123 : Error:checksum mismatch, Last Line: 748
18:17:14.123 : Resend: 749
18:17:17.436 : Error:checksum mismatch, Last Line: 781
18:17:17.436 : Resend: 782
18:17:20.936 : Error:checksum mismatch, Last Line: 814
18:17:20.936 : Resend: 815
18:17:20.952 : Error:Line Number is not Last Line Number+1, Last Line: 814
18:17:20.952 : Resend: 815
18:17:21.389 : Error:Line Number is not Last Line Number+1, Last Line: 817
18:17:21.389 : Resend: 818
18:17:24.827 : Error:checksum mismatch, Last Line: 843
18:17:24.827 : Resend: 844
18:17:33.711 : Error:checksum mismatch, Last Line: 898
18:17:33.711 : Resend: 899
18:17:42.540 : Error:checksum mismatch, Last Line: 939
18:17:42.540 : Resend: 940
18:17:57.776 : Error:checksum mismatch, Last Line: 1004
18:17:57.776 : Resend: 1005
18:18:01.167 : Error:Line Number is not Last Line Number+1, Last Line: 1019
18:18:01.167 : Resend: 1020
18:18:12.728 : Error:checksum mismatch, Last Line: 1087
18:18:12.728 : Resend: 1088
18:18:13.087 : Error:checksum mismatch, Last Line: 1091
18:18:13.087 : Resend: 1092
18:18:14.915 : Error:checksum mismatch, Last Line: 1108
18:18:14.915 : Resend: 1109
18:18:14.947 : Error:Line Number is not Last Line Number+1, Last Line: 1108
18:18:14.947 : Resend: 1109
18:18:15.040 : Error:Line Number is not Last Line Number+1, Last Line: 1112
18:18:15.040 : Resend: 1113
18:18:21.369 : Error:checksum mismatch, Last Line: 1175
18:18:21.369 : Resend: 1176
18:18:30.276 : Error:checksum mismatch, Last Line: 1314
18:18:30.276 : Resend: 1315
18:18:31.338 : Error:checksum mismatch, Last Line: 1338
18:18:31.338 : Resend: 1339
18:18:36.101 : Error:Line Number is not Last Line Number+1, Last Line: 1460
18:18:36.101 : Resend: 1461
18:18:42.478 : Error:checksum mismatch, Last Line: 1622
18:18:42.478 : Resend: 1623
18:18:46.712 : Error:Line Number is not Last Line Number+1, Last Line: 1720
18:18:46.712 : Resend: 1721

I tried uninstalling Repetier Host, and reinstalling. Then I uninstalled 1.0.6 and installed 1.0.4 again. I uninstalled the driver of my RAMPS board, and reinstalled it. I tried another print....

Nothing helped :-(

Did anybody have these issues before? What can I do to fix this?

Thanks!
Re: Lots of checksum mismatches lead to Repetier crash
February 23, 2015 01:38PM
Update:

I thought of one more thing I could do. I did a full System Restore to a couple of days back. This did not get rid of the checksum errors, but it seems like my test print of the simple cylinder is going well...

Would this have something to do with the RAMPS board not being able to follow? The first time I got into real trouble with Repetier crashing after these checksums, I tried to print a more complex item. Maybe the RAMPS got stuck somehow there?...

I will now try that more complex piece again...
Re: Lots of checksum mismatches lead to Repetier crash
February 23, 2015 01:49PM
Repetier Host does not seem to be crashing anymore. However, I got about 80 errors like

19:29:55.529 : Error:checksum mismatch, Last Line: 8090
19:29:55.529 : Resend: 8091

I assume this is not normal? The item I am printing is this one. I printed already the lamp itself, but the cell_triple_base gives all these errors... I do not know if the lamp also gave these errors, as it printed nicely...
Re: Lots of checksum mismatches lead to Repetier crash
February 23, 2015 02:07PM
I have to take my words back :-( Repetier has stalled again, and the print just stopped in the middle of printing. Somewhere along layer 15 it stopped. Repetier did not crash, but I had to disconnect and reconnect the printer to get it moving again (home).

These were the last error messages:
19:46:28.053 : Resend: 40768
19:46:28.059 : Error:No Line Number with checksum, Last Line: 40767
19:46:28.084 : Error:checksum mismatch, Last Line: 40768
19:46:28.084 : Resend: 40769
19:46:30.793 : Error:checksum mismatch, Last Line: 40859
19:46:30.793 : Resend: 40860
19:46:34.236 : Error:Line Number is not Last Line Number+1, Last Line: 40964
19:46:34.236 : Resend: 40965
19:46:34.805 : Error:checksum mismatch, Last Line: 40978
19:46:34.805 : Resend: 40979
19:46:35.780 : Error:checksum mismatch, Last Line: 41006
19:46:35.780 : Resend: 41007
19:46:35.953 : Error:Line Number is not Last Line Number+1, Last Line: 41008
19:46:35.955 : Resend: 41009
19:46:35.968 : Error:checksum mismatch, Last Line: 41008
19:46:35.968 : Resend: 41009
19:46:35.974 : Error:No Line Number with checksum, Last Line: 41008
19:46:35.976 : Error:Line Number is not Last Line Number+1, Last Line: 41008
19:46:35.976 : Resend: 41009
19:46:36.095 : Error:Line Number is not Last Line Number+1, Last Line: 41011
19:46:36.097 : Resend: 41012
19:46:37.758 : Printing layer 15 of 66
19:46:38.442 : Error:Line Number is not Last Line Number+1, Last Line: 41076
19:46:38.445 : Resend: 41077
19:46:39.814 : Error:Line Number is not Last Line Number+1, Last Line: 41139
19:46:39.816 : Resend: 41140
19:46:46.646 : Error:checksum mismatch, Last Line: 41506
19:46:46.646 : Resend: 41507
19:46:51.398 : Error:Line Number is not Last Line Number+1, Last Line: 41745
19:46:51.400 : Resend: 41746
19:47:01.311 : Error:Line Number is not Last Line Number+1, Last Line: 42279
19:47:01.313 : Resend: 42280
19:47:01.421 : Error:Line Number is not Last Line Number+1, Last Line: 42286
19:47:01.423 : Resend: 42287
19:47:01.443 : Error:checksum mismatch, Last Line: 42287
19:47:01.443 : Resend: 42288
19:47:01.480 : Error:checksum mismatch, Last Line: 42289
19:47:01.480 : Resend: 42290
19:47:02.662 : Error:Line Number is not Last Line Number+1, Last Line: 42378
19:47:02.664 : Resend: 42379
19:47:02.682 : Error:Line Number is not Last Line Number+1, Last Line: 42379
19:47:02.684 : Resend: 42380
19:47:02.704 : Error:checksum mismatch, Last Line: 42380
19:47:02.704 : Resend: 42381
19:47:02.734 : Error:checksum mismatch, Last Line: 42382
19:47:02.734 : Resend: 42383
19:47:04.416 : Error:Line Number is not Last Line Number+1, Last Line: 42509
19:47:04.418 : Resend: 42510
19:47:04.444 : Error:checksum mismatch, Last Line: 42511
19:47:04.444 : Resend: 42512
19:47:05.288 : Error:checksum mismatch, Last Line: 42577
19:47:05.288 : Resend: 42578
19:47:49.144 : Error:checksum mismatch, Last Listart

And the last lines before stop:
19:47:07.900 : N42749 G1 X-13.266 Y-16.633 E2.70411 *78
19:47:07.914 : N42750 G1 X-12.24 Y-16.78 E2.76439 *70
19:47:07.936 : N42751 G1 X-11.205 Y-16.822 E2.82468 *77
19:47:07.947 : N42752 G1 X-10.171 Y-16.761 E2.88496 *76
19:47:07.973 : N42753 G1 X-9.149 Y-16.596 E2.94524 *113
19:47:49.144 : Error:checksum mismatch, Last Listart

I do not get what's going wrong now... I never had this before, all went well at considerable higher speeds even... Anybody and idea?

Edited 1 time(s). Last edit at 02/23/2015 02:08PM by Stephanel.
Re: Lots of checksum mismatches lead to Repetier crash
February 23, 2015 02:44PM
Hey guys!

It seems like I solved my question! Apart from upgrading my Repetier Host, I also took another USB cable laying around. This one was significantly longer (1.5m) than the previous one. Now I am printing happily at full speed, and already at layer 2 without any error message at all!

Hope this will solve somebody else's problem sometime!
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