Find out which firmware your machine needs by following these steps:
1) Does your Creatr have a black drag chain that guides the wires from the printing carriage to the back of the machine?
Yes: Go to step 2 No: Go to step 3
2) Measure the diameter of the machine's back Z-axis pulley like shown in the photo below
Z-axis pulley diameter:
20 mm
Single - 2a Marlin
Dual - 2b Marlin
30 mm
Single - 1a Marlin
Dual - 1b Marlin
Creatr XL click here
3) Measure the diameter of the machine's Z-axis spindles.
Z-axis spindle diameter:
16 mm
Single - 3a Marlin
Dual - 3b Marlin
10 mm
Single - a4 Marlin
Dual - 4b Marlin
8 mm
Single - 5a Marlin
Dual - 5b Marlin
ATTENTION!!!
While checking the Z pulley please also have a look at the electronic board and see what type of board your Creatr printer has; If the printer has the electronic board from below then you need to follow the links below in order to download the proper firmware for that board: