Dear Mr. Eric Seevers,
First of all, we express our sincere thanks for your kind interest. It’s true that one certain block is good for a bag length that it is designed to print on. But please be kindly noted that the size of logo/letters carved on the block are fixed, so for example the printing on narrower bags might appear large and on contrary might be too small for wider bags. Furthermore, wider bag’s length might not correspond to its width as it does with a narrower one. If you think the facts given do not matter much to you then it’s OK. You only just let us know the minimum and maximum width you are going to print with the block and your printing size (eg. Size to match your 20 cm. would look like too narrow for 30 cm width). Our block can be used to print on every kind of plastic that we showed you last time.
According to the your sketch drawings of cut line for T- shirt bags, for size 20 cm. we will use our 8 inch normal punch cutter and for 30 cm. we use 12 inch, so the outcome handle width will be a little bit different from your drawing but still proportional to bag size. Please let us know if you are OK with our respond and subsequently appoint us your free time so that we could send our personnel to meet you to discuss further. Once again thank you for your kind support.
Best regards,