Help me get my core one printing! *assembly issue
I have had my upgrade kit for almost a year now and have yet to finish building it. The problem is the belts - no matter what I do it keeps slipping off the nextruder holder. When I get it attached and try to run it, it slips off again resulting in having to disassemble the entire nextruder and starting over.
So does anyone have any tips that worked for them to keep the belt from slipping out? I was hoping someone could create a tool or maybe a back plate that locks the belts in?
I have already contacted prusa support and was sent a box to send it it for repair only to have the person approving my repair tell me they were going to charge me more than the value of an assembled core one.
ANY help addressing this problem would be HUGE.
RE:
The belts, if routed correctly in the back plate, self-lock. When looped around in the harness, the belt teeth should interlock and prevent the belt from slipping out. I would suggest carefully checking the belt routing as well as how the belts are inserted into the harness that is attached to carriage of the linear rail.
There is no need to create a back-plate or other such device. If routed correctly, the belts should never slip out.
It will help a lot if you post some photos. Otherwise, just have to guess.
RE:
...also if you search in this forum there should be a thread only a couple of months old where a similar problem was discussed at length (hyiger was involved heavily in that discussion too) and there were pictures taken and a lot of explanation given.
In short, if mounted correctly, the belt toothed part loop on top of each other locking the belt end in place. Once the plate is screwed up, it also applies pressure to the 4 belt ends additionally locking them up.
In your case if you see that the belt ends are not "tooth over tooth" you have them wrong. More precisely, it should look like this: https://help.prusa3d.com/guide/5-corexy-assembly_835522#864874
Also read the user comments in the instructions on how to easily screw the part on!
RE: Help me get my core one printing! *assembly issue
Interesting, it seems that on pre-assembled printers most of the issues (I see on the forums) are related to: resonance noise, incorrectly inserted nozzle/heatblock. And for self assembled printers, belt-routing. Then there are the common issues like: motor grounding, nozzle probes failing, skewed bed.
If it wasn't for this forum (when I was building out my kit) I would have taken put my printer into a hydraulic press (while it was trying to print) and posted it on YouTube.
RE: Help me get my core one printing! *assembly issue
The belt can only slide out, if you dont follow the installing instructions: The toothed sides of the belt must be interlocking. If difficult to fiddle through, then loose both tension screws to have it easier. Look at the photo in @chmax post above.
RE: Help me get my core one printing! *assembly issue
Hi @soulbladeofdawn, th epic I've sent makes it rather easy to set it up right: if it doesn't look exactly like that there is a problem.
Did you tried it already? Additionally, if you could send a few pictures of how your belts look like it would make things easier for the people on this forum to help you.
RE: Help me get my core one printing! *assembly issue
He probably figured it out on his own and we won't hear anything back.
RE: Help me get my core one printing! *assembly issue
Actually just been busy and haven't had free time to try anything yet. 🙂 I intend to try out the posted help and will update.
I am fairly sure i am routing the belt correctly..but there is so little slack that the belt slides out of position.
RE: Help me get my core one printing! *assembly issue
Actually just been busy and haven't had free time to try anything yet. 🙂 I intend to try out the posted help and will update.
I am fairly sure i am routing the belt correctly..but there is so little slack that the belt slides out of position.
Just loosen the belt tensioners to the max, even if they fall out you'll put'em in again. Give yourself slack to work it properly!
RE: Help me get my core one printing! *assembly issue
but there is so little slack that the belt slides out of position.
This still implies to me that your belts are not routed correctly. There should be enough slack left that it shouldn't be too hard to get them inserted so they do not slip.
RE: Help me get my core one printing! *assembly issue
Are the belts routed like this?
Please send some photos. It would be much more easier to help you !
RE: Help me get my core one printing! *assembly issue
I just built my Core One about 3 months ago, and my belts were routed correctly, but my fat fingers couldn't get the 4-5 teeth connections. I ended up releasing the belt tensioners completely (hanging loose), made the connections and then reconnected the belt tensioners. I just could not secure the belt completely otherwise.
RE:
Hello, perhaps the XY carriages (2x) are swapped?
Like a gentleman who worked in support for 40 years. 😜
He had the same problem: the belts were too short and kept slipping out of the Nextruder plate. Please check if everything on the Core XY system looks exactly like the image of the XY unit installation. Pay particular attention to the XY carriages on the sides of the Y-axis.
https://help.prusa3d.com/guide/5-corexy-assembly_982276#989086 green arrow
https://help.prusa3d.com/guide/5-corexy-assembly_982276#992522 3. picture
RE: Help me get my core one printing! *assembly issue
I will update hopefully this weekend. When I posted this I anticipated having time to work on my printer...but that fell through. I lead a very busy life so spare time to work on the printer is limited to weekends at best and often those weekends are booked as well. Hoping this sunday I will have time! 🙂
RE: Help me get my core one printing! *assembly issue
Finally had time to work on the printer. I took my time and tried to follow instructions as closely as I could. The belt still slipped out after failing to home.
I added pictures this time too!
Please tell me what you think I am doing wrong. I just want to print again!
RE: Help me get my core one printing! *assembly issue
Since my pictures are not displaying, adding them here
RE: Help me get my core one printing! *assembly issue
It would be nice if you could post a photo showing the belt guide in the xy frame without it being obscured by the gantry, so that the motor mounts can be seen.
RE: Help me get my core one printing! *assembly issue
- Is the belt routing around the X and Y motor axes correct? (direction and height)
- Is the X motor located at the rear left?
RE: Help me get my core one printing! *assembly issue
Why is the plug still in the linear rail?
It has to come out in Step 36 , otherwise the bearing can't move!
RE:
Ok, the picture is not the best one you could have uploaded 😀 this said, if I look at the upper belt, I see only one tooth coming back out. You will need 4 or 5 so that they can interlock with the rest of the belt and not slip back out.
Compare your picture with this one:
https://help.prusa3d.com/guide/5-corexy-assembly_835522#864874
You can see that, above the violet arrows, there is a piece of the belt coming back out (you can count 4 teeth). Once the part is mounted and tightened the belt and that piece will lock down for good.
Could you please share a picture of your part ready to be bolted on, like in the picture above?
Also the previous poster is right: the plugs need to come off!