There are 2 types of plastic badge makers or machines in the market, both carrying 2 different sizes in terms of mylar film size.

Type 1 Square Badge Machine/ Maker
Mould Size: 61mm x 61mm
This refers to the mould for placing the metal shells, artwork paper and mylar film.
Commonly refers as top mould.

Type 2 Square Badge Machine/ Maker
Mould Size: 63mm x 63mm
This refers to the mould for placing the metal shells, artwork paper and mylar film.
Commonly refers as top mould.

Please see thee illustration below for explanation.
Key differences between these 2 machines are:
1. Machine body design has a slight different of design, refers exhibit 1.
2.Bottom or base of the machine is flat surface on machine type 1 versus groove edge on machine type 2.