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?
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/11000279037/original/Creatr%20-%20black%20drag%20chain.PNG?1452147960)
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
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/11000279093/original/Creatr%20-%20measing%20the%20z%20axis%20pulley.PNG?1452148119)
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.
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/11000279000/original/no%20drag%20chain.PNG?1452147831)
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:
Creatr Dual
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/11002362114/original/Capture.PNG?1457429347)
To upload the firmware, see the following solution article: