You can use mixed media paper (heavier than regular sketch paper) or acrylic paper (heavier weights tend to be more suitable for acrylics).

If you use an Xacto knife you need to do multiple cuts, first cutting at one angle, then again at another angle to end up cutting a V-shaped groove. If you only do a single cut, it will mostly close up again, and not show up very much when you're printing. Xacto knives are good for cutting out very small shapes.

The same thing was happening to me: very low ambient humidity can make ink dry faster, so I ran a small humidifier where I was working and it helped a little. I also bought something called “ink extender” (also made by Speedball, it’s milky off-white in the tube) and I mixed that with my ink while rolling it out, and that also helped. Hope you can find a solution that works for you!

First guess is that too much of file’s code was changed or the beginning (head) or the end of the file’s code was damaged. Also specific to the sound method, it’s possible the length changed causing that error or some of the import/export settings were mismatched.

prefer import: bmp format , U-Low, NO ENDIANNESS, 1 channel mono export: same as in video, but u need rename to bmp format keep image headers alive (some time from start and end) gl