Thumbnails not rendering?  

Thumbnails not rendering?

Hi all,

I am using PrusaSlicer 2.7.1 on the default mk4/IS printer profile and I am finding the thumbnails for the slices I generate are not being interpreted. By PrusaLink or PrusaConnect. I can't be 100% sure if they're being rendered by the printer. Will check and update.

I had a look through the gcode and compared a couple of files, one with thumbnails that render and one with thumbnails that do not render. 

The similarities are that thumbnails exist on both files. The differences are that the ones that work were generated by PrusaSlicer 2.7.0 and have one less format:

PrusaSlicer 2.7.0 - thumbnails render correctly:

$ cat Temperature-Tower_220-265_0.4n_0.2mm_PETG_MK4IS_1h39m.gcode | grep -i thumbnail 
; thumbnail_QOI begin 16x16 644 
; thumbnail_QOI end 
; thumbnail_QOI begin 313x173 57800 
; thumbnail_QOI end 
; thumbnail_QOI begin 440x240 94000 
; thumbnail_QOI end 
; thumbnail begin 640x480 162688 
; thumbnail end 
; thumbnails = 16x16/QOI, 313x173/QOI, 440x240/QOI, 640x480/PNG 
; thumbnails_format = PNG

PrusaSlicer 2.7.1 - thumbnails not rendering

$ cat Temp_Tower_PETG_0.4n_0.2mm_PETG_MK4IS_1h59m.gcode | grep -i thumbnail 
; thumbnail_QOI begin 16x16 752 
; thumbnail_QOI end 
; thumbnail_QOI begin 313x173 57992 
; thumbnail_QOI end 
; thumbnail_QOI begin 440x240 94964 
; thumbnail_QOI end 
; thumbnail_QOI begin 480x240 101120 
; thumbnail_QOI end 
; thumbnail begin 640x480 165328 
; thumbnail end 
; thumbnails = 16x16/QOI, 313x173/QOI, 440x240/QOI, 480x240/QOI, 640x480/PNG 
; thumbnails_format = PNG

Notice the above has 5 thumbnail images in different resolutions, where the one that works has 4 - it is missing 480x240/QOI. This isn't the problem. I removed this thumbnail, changed the thumbnails line and re-uploaded - it still does not render.

I'm not certain where the issue lies... I suspect it is the slicer more than prusalink/prusaconnect/firmware.

Any suggestions?

Thanks in advance; Pedro.