Here you are. https://ufile.io/0kbhm
~ -70% filesize. Same visual ingame quality.
Best regards!

Was it optimized with this tool? https://forums.factorio.com/viewtopic.php?f=70&t=30591#p250171

You can also just tint them. See https://mods.factorio.com/mod/df_belt_graphics

Hello, darkfrei! Yep, it was PINGA. I already optimize your df_belt_graphics masks too (with grayscale options, so it allowed to reduce the size even more).
Yea, if author will tint his belts, then size reduced a lot more.

how you make a 0.17 version... :)

I don't want to change the graphics like it was done in 0.17.
I can make same graphics with blender, but corners are very complicated.

Hey there! Thanks for update to 0.17!
I'm redone optimization for your new gfx and compress it for 1/3 more. Here you are: https://ufile.io/nkcsq
I think you can optimize size of your mod way more if you can do colorless masks like author of miniloader mod does (check it out). Also this trick reduce use of videomemory so great.
Best regards!

i already ran the sprite sheets through the program you used last time tho? I wonder why you were able to get them smaller