Long STL filename breaks communication with printer

yodor

Just spotted this. I'm trying to print STL file with name ' Universal_Filament_Filter_smaller_filament-exit-hole_v02_By_CT3D.stl'This somehow bugs the firmware and after slicing (slic3r) and clicking print the host continues to show 'warning seems like we missed a ok - continue sending' The display area on the printer LCD where the filename is shown on the first row is empty

yodor

After renaming the STL file and re-slicing the warning error message is gone

Repetier

Do not expect firmware to support such long filenames. Some may others not. Not that any firmware can print stl files - you need to slice it first and give it a shorter name. This is a memory problem firmwares have. Most have only 8kb for everything so every byte more can cause problems. Repetier supports 26 chars = 2 directory entries by default.

yodor

yes I can understand that and is all fine. But is it not better if Repetier-Host trim/cut the filename to this exact size before sending to printer firmware. ?

Repetier

It is the firmware trimming filenames in this case. Host just takes what it gets. Limits are define din repetier.h

#define MAX_VFAT_ENTRIES (2) /** Total size of the buffer used to store the long filenames / #define LONG_FILENAME_LENGTH (13MAX_VFAT_ENTRIES+1) #define SD_MAX_FOLDER_DEPTH 2
Increase MAX_VFAT_ENTRIES to 3 and you get 39 chars used by firmware along with higher ram usage, which is only an issue for deltas.