Jump to content
Sign in to follow this  

Marlin won't connect - what up?

Recommended Posts

Posted · Marlin won't connect - what up?


I have a UM delivered 26 March, has version 1.5.6 motherboard and Arduino 2560. This has been running fine using whatever original firmware it came with, and RepV version 0026, connecting to Windows 7 Professional on COM6.

Recently my son has "upgraded" it to Marlin or somesuch, and tried using Cura 12.11 .

The machine is now pretty much junk - using Cura we can "Expert" -> Install default Marlin firmware"

and it tells us "Installed firmware: ultimaker_250000.hex" OK. This has junked the machine - it cannot connect, the "Print" dialog tries all the baud rates and fails to connect. But just what IS this "default firmware" ? Is there a .hex file somewhere? If so, what and where?

Using Cura 12.11 to upload other versions of firmware from


sometimes partially works - with some Cura connects, the X & Y axes work, it can build my shape for about 10 minutes and then suddenly locks up, and I have to use Task Manager to kill the build.

I'm getting desperate - right now I'd be happy to recert to RepG 0024, if only I knew the original firmware file.

Can someone please advise us what's going on here? E.g. there's no README fil in the //firmware folder to tell you what's meant to work with what machine & what software; frequently I've seen Cura & RepG whinge about not being able to find som .xml file at start-up - does this matter?

Advice please - my machine's a real mess and I'm getting very frustrated right now trying tons of stuff that doesn't work. I really want to see something simple to use - why should I have to attempt some custom-build and muck around somewhere with my extruder settings? My extruder has the "Newbolt.jpg" type knurled-bolt, it's the lower of the 2 images on

http://http://wiki.ultimaker.com/Marlin ... _Ultimaker

page. My machine is standard - please can I have a simple file to upload to the firmware, and please can I know what version of Cura is stable and won't lock-up after 10 minutes running. My PC is fast, a core I7 with 6GB ram, USB2 ports, and was rock-solid with original Arduino code & RepG Ver 0024. I want it rock solid again please.



Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!