I didn’t have the same problem as @volivaa…mine is still intact and runs just fine.
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That’s good! I’m glad it’s not so bad 
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If the third wheel on the X carriage is sprung, like they are on the Y carriage it should be relatively easy to pop it back on. Hook the back wheel over the V rail and pull forward to allow the front wheels to slip over the front V rail. Ensure the belt is still over the pulleys and it should be good to go.
Or see what support have to say.
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The rear wheel is spring loaded.
It takes a good amount of force to pull the head carriage forward and compress that spring though. Unless it just wasn’t completely seated to start with, or it took a jolt during shipping, you’d have to lock the gantry in place to pull enough force to disengage the carriage like that.
Whatever the cause, it’s good reason to push/pull on the gantry itself if someone needs to manually move the head for any reason.
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Yeah, judging from that photo, I believe the “V”-bearing is intended to run along the rail (shown in red, below). And the V-bearings behind the belts are supposed to run along a similar rail on the backside.
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I took pictures before attempting to fix. Was exactly as you folks described and took 30 seconds or less to reattach. I had done things like this before, but did not attempt until I was confident it was similar. A test engrave worked great! The Sheldonians is our trivia team.
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Yay, I’m so glad you got it fixed. And I’m glad we have such helpful people here in the forum! (Best forum ever. Seriously.)
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I’m so glad to hear you’re back up and printing!
I’m going to go ahead and close this thread. If the problem reoccurs go ahead and start a new thread or email support.
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