Cause
When superposing toner, the pressure during transfer causes toner to contract, thus causing worm holes.
This is likely to occur if:
There is a large amount of toner deposit.
When using in a high temperature or high humidity environment.
When using paper with a high degree of smoothness.
Clear toner is fed with a high image area ratio.
When using small size paper (the smaller the paper size, the more likely the problem is to occur).
