How to label PUR and EPE materials?

Another demonstration with printing on PUR and EPE materials with the BENTSAI B35 printer and solvent cartridges.
1st print on gray no. 6, all others on gray no. 10.
An auxiliary ruler was also used because the material is soft.
One print without a ruler, when thanks to the soft material the printer "sinks in" and blurs the print.
So we recommend with a ruler.
Otherwise, the QR code and barcode are 100% readable.