RE: Failed Y-calibration of a new CoreOne
Sorry, would happily have done this for you, but it’s packed up and back in the box already! 🙂
I had no issues with getting the belts both tuned to exactly the same tension, or yes, that might have been a good suggestion, thanks.
I’m genuinely disappointed, but at the same time relieved to have saved myself the further stress and hassle of trying to resolve this.
This would have been my first Prusa, and was really looking forward to using it. I might revisit it again in the future, but for the price paid I’m not willing to hold on to a machine giving issues like this from the start.
@BigScotAl, I know it must be frustrating. I feel your pain! Just a question for you before you send it back. Can you take a look at the tension adjustment pulleys and screws? Are they both pretty evenly adjusted, or is one substantially (> 2-3mm) more extended than the other? If so, you might be able to reattach the belt ends a notch or two, as needed, to get them balanced. Just speculating; I’m still waiting on mine.
RE: Failed Y-calibration of a new CoreOne
Sorry, would happily have done this for you, but it’s packed up and back in the box already! 🙂
I had no issues with getting the belts both tuned to exactly the same tension, or yes, that might have been a good suggestion, thanks.
I’m genuinely disappointed, but at the same time relieved to have saved myself the further stress and hassle of trying to resolve this.
This would have been my first Prusa, and was really looking forward to using it. I might revisit it again in the future, but for the price paid I’m not willing to hold on to a machine giving issues like this from the start.
@BigScotAl, I know it must be frustrating. I feel your pain! Just a question for you before you send it back. Can you take a look at the tension adjustment pulleys and screws? Are they both pretty evenly adjusted, or is one substantially (> 2-3mm) more extended than the other? If so, you might be able to reattach the belt ends a notch or two, as needed, to get them balanced. Just speculating; I’m still waiting on mine.
Thank you for objectively relating your experience, as it may prove helpful when I get my kit. I’m sure you’ll find something that works for you. There are plenty of good choices - none perfect. Some people like the DIY challenges. Some don’t like, or just don’t have the time.
Cheers!
MK4S/MMU3
RE: Failed Y-calibration of a new CoreOne
[...] the full printer fits back in the kit box if you just remove the door!
Did Prusa support actually tell you to use that box for your return shipment of the printer? Looks like there is very little room for padding material in two of its dimensions -- I would no be comfortable at all with using it. When I had asked Prusa a month ago to confirm the possibility of returning fully built kits, they wrote that they would send suitable packaging materials for the completed printer in that case.
RE: Failed Y-calibration of a new CoreOne
They said it was up to me to package it for the return. It is quite a neat fit in the box, but I did still manage to squeeze some of the packing foam round all of the sides.
[...] the full printer fits back in the kit box if you just remove the door!
Did Prusa support actually tell you to use that box for your return shipment of the printer? Looks like there is very little room for padding material in two of its dimensions -- I would no be comfortable at all with using it. When I had asked Prusa a month ago to confirm the possibility of returning fully built kits, they wrote that they would send suitable packaging materials for the completed printer in that case.
RE:
They said it was up to me to package it for the return. It is quite a neat fit in the box, but I did still manage to squeeze some of the packing foam round all of the sides.
Maybe send them a photo of the open package and ask for their blessing on the padding and packaging before you ship it out? You don't want to get into discussions of liability if shipping damage should occur.
In the unboxing videos of assembled Core Ones, I also noticed that the Nextruder was secured in the middle of the X gantry by suitably sized pieces of cardboard wrapped around the gantry to its left and right. Iassume there as also some way to stop the whole gantry from moving in the Y direction, but don't recall seeing it in the videos. Again, I would ask support for instructions -- and maybe for sending the official materials -- to avoid potential arguments about the responsibility for damage.
RE: Failed Y-calibration of a new CoreOne
It's a valid point. Contacted support again, and this agent suggested that they may be able to sent me out a proper box/packaging to return the assembled kit. I'll hear back from them possibly tomorrow with a firm answer he said.
They said it was up to me to package it for the return. It is quite a neat fit in the box, but I did still manage to squeeze some of the packing foam round all of the sides.
Maybe send them a photo of the open package and ask for their blessing on the padding and packaging before you ship it out? You don't want to get into discussions of liability if shipping damage should occur.
In the unboxing videos of assembled Core Ones, I also noticed that the Nextruder was secured in the middle of the X gantry by suitably sized pieces of cardboard wrapped around the gantry to its left and right. Iassume there as also some way to stop the whole gantry from moving in the Y direction, but don't recall seeing it in the videos. Again, I would ask support for instructions -- and maybe for sending the official materials -- to avoid potential arguments about the responsibility for damage.
RE: Failed Y-calibration of a new CoreOne
It's a valid point. Contacted support again, and this agent suggested that they may be able to sent me out a proper box/packaging to return the assembled kit. I'll hear back from them possibly tomorrow with a firm answer he said.
It would be very interesting and very good if they did that.
I'm currently frustrated with the same problem as many here. The fact that you have to bend it yourself is very strange. After assembling my first mk3s+, mk4, mk4s upgrade kits, there were problems EVERY time, some of which were partially solved by replacing parts. But there was never a device that worked without problems straight away. Now that I've bought an even more expensive model and can't be happy that everything works straight away after assembly, it's so frustrating that I'm slowly losing interest in Prusa products. It's just as frustrating when you can't eat the last Haribo bears because the calibration doesn't work at the last point. A little fun is a must. But I'm actually thinking about sending the device back first and going for Bambulab.
But what is also extremely annoying is that no support has contacted me since Wednesday to suggest a solution. They wanted to send me the two mounts again. So far no response, nothing. And I think to myself that I don't have to put up with this any more.
The positive thing about the Core One is that it was fun to put it together, finally something different from the old mk3/mk4 devices. A nice change.
I will now try to solve the problem for a few more hours, but if I can't and don't receive a support response, I have decided to return the product.
RE: Failed Y-calibration of a new CoreOne
I will now try to solve the problem for a few more hours, but if I can't and don't receive a support response, I have decided to return the product.
Getting the gantry straightened and the Y calibration to work should really not be a major issue. Please give it another try!
First, is the underlying problem really that the gantry is not straight? I.e. if you power off the motors (mains switch or Control > Disable motors menu entry) and push the X gantry to the front, does it not touch the left and right end stops evenly? If they are uneven, I think this guide by MartinF is the best way to square the gantry without much disassembly.
Second, there can be another reason for Y calibration failures, and that is excessive friction on the Y axis. I ran into this after I had installed the right side panel: The cable from the filament sensor did not slide through its zip tie on the CoreXY frame, but decided to get stuck and bulge inwards instead. It rubbed against the Y linear bearing and caused enough friction to make the motors loose steps and hence make the Y calibration fail. (I could also feel the friction when moving the Y axis by hand, again with the motors powered off.) Pushing the cable back through the zip tie to straighten it and get it out of harm's way was quick; no disassembly needed.
Fingers crossed that one of the above will solve the problem for you!
RE: Failed Y-calibration of a new CoreOne
Still trying to get my return resolved. Support have now provided me with very specific instructions on how the printer must be packed, and photos taken during the packing process and sent to them for approval, before they will supply the returns label.
The email from support stated that it was "unfortunately not possible" for them to supply me with the correct packaging. Of course its possible. I personally think this translates as "this would cost us money".
Given the very specific requirements outlined for the packing of the machine, and their comments regarding liability for damages, then I have to say that I strongly believe that the best chance of returning the machine to them undamaged would be by having it in the proper bespoke packaging.
I'm already going to lose out on the shipping charges to have the machine sent out originally. I'm not sure why I should now have to source and fund the required box and packing materials to return an item which I believe to be faulty.
I have stated as such to support, and await a further update.
It's a valid point. Contacted support again, and this agent suggested that they may be able to sent me out a proper box/packaging to return the assembled kit. I'll hear back from them possibly tomorrow with a firm answer he said.
It would be very interesting and very good if they did that.
RE:
The email from support stated that it was "unfortunately not possible" for them to supply me with the correct packaging. Of course its possible. I personally think this translates as "this would cost us money".
Hmm, that's disappointing. Support was very clear when I asked about the return option for kits; see below.
Nevertheless, I am still pleasantly surprised that Prusa offer returns for kits at all. It must cost them significant time to inspect and overhaul the returned units -- some builders (not you!) are bound to find creative ways of messing things up...
Hello Jürgen,
In case you're unhappy with your kit, there is no need to dissasemble it. You can contact us and state that you wish to return it, and, provided you're within the 60 day window of return, we'll process a return in which we'll send packaging for your assembled printer so you don't have to dissassemble.
Kind regards, saludos cordiales.
...
Customer SupportPRUSA Research | Partyzanska 188/7a | 17000 Prague
info@prusa3d.com | www.prusa3d.com
RE: Failed Y-calibration of a new CoreOne
Hello Jürgen,
In case you're unhappy with your kit, there is no need to dissasemble it. You can contact us and state that you wish to return it, and, provided you're within the 60 day window of return, we'll process a return in which we'll send packaging for your assembled printer so you don't have to dissassemble.
Kind regards, saludos cordiales.
...
Customer SupportPRUSA Research | Partyzanska 188/7a | 17000 Prague
info@prusa3d.com | www.prusa3d.com
That is what good service looks like. But who pays for the return shipping?
I wonder what their policy will be on MK4S>CoreOne upgrades. I imagine they’d offer a refund, but I’d have to downgrade to return the kit. That would mean disassembling the CoreOne and rebuilding the MK4S. I’m retired, but I don’t have THAT much free time!
I should probably change my order to a kit. Then I can decide later which one I want to keep and sell the other one. That makes more sense, except for the fact I’m in the U.S. and I’d then have to pay the (what day is it) tariff for our illustrious leader. 🤬
MK4S/MMU3
RE: Failed Y-calibration of a new CoreOne
That is what good service looks like. But who pays for the return shipping?
The help page describes that Prusa will prepare and provide a return shipping label, but will deduct the cost for that from the refunded amount. So the customer pays the return shipment.
Costs for the original product shipment will be refunded -- unless it was a partial return only and the customer kept some of the originally shipped articles. (Understandable; otherwise one could "play the system" and effectively get free shipping, by always including an item in each order which one returns later.)
RE:
In my case, they will pay for the return shipping of the kit. At least, that is what they have led me to believe.
"Yes, the return shipping will be covered but the shipping costs you already paid for shipping it to your address won't be returned"
Like yourself though, I am left wondering exactly how best to try and reclaim the import duties that had to be paid on the package when it arrived in the UK. With the other odds and ends I had added to the order, the duty amounted to just under £200.
I think I should be able to reclaim this somehow, but it will inevitably be a long winded and convoluted process to do so.
Hello Jürgen,
In case you're unhappy with your kit, there is no need to dissasemble it. You can contact us and state that you wish to return it, and, provided you're within the 60 day window of return, we'll process a return in which we'll send packaging for your assembled printer so you don't have to dissassemble.
Kind regards, saludos cordiales.
...
Customer SupportPRUSA Research | Partyzanska 188/7a | 17000 Prague
info@prusa3d.com | www.prusa3d.comThat is what good service looks like. But who pays for the return shipping?
I wonder what their policy will be on MK4S>CoreOne upgrades. I imagine they’d offer a refund, but I’d have to downgrade to return the kit. That would mean disassembling the CoreOne and rebuilding the MK4S. I’m retired, but I don’t have THAT much free time!
I should probably change my order to a kit. Then I can decide later which one I want to keep and sell the other one. That makes more sense, except for the fact I’m in the U.S. and I’d then have to pay the (what day is it) tariff for our illustrious leader. 🤬
RE: Failed Y-calibration of a new CoreOne
I have also been told that I have to be patient until the returns department get back to me and go through the next steps. So far, however, I haven't received a single email or any information that the return has been initiated.
I am seriously considering dismantling the printer and packing it up again.
RE:
Another one bust the dust ....
Bought Kit one, but as I didn't get it, I paid extra to get Assembled one, and I got it Yesterday, had no time to check so I did it Today. I think calibration passed, not sure anymore, because after 3 hours with live support chat it doesn't pass, and I get belt tension error even if its 85Hz.
Right side is way off, I would say 2-3 mm or more.
Not sure should I do solution found here, or should I return it... to expensive game for me, if it doesn't come working and by some posts quality of the prints even after solved this issue is not as expected?
RE: Failed Y-calibration of a new CoreOne
I also contemplated this, but there's practically zero chance of doing so in a manner that would be acceptable. It would just end up as a pile of metal and plastic parts, and a bag full of mixed nuts, screws, washers etc.
I'm not in a great hurry to actually get it dispatched back, as long as I know things are heading in the correct direction with getting it organised. Hopefully support get back to me soon with a more realistic option regarding the packaging of the assembled unit.
I have also been told that I have to be patient until the returns department get back to me and go through the next steps. So far, however, I haven't received a single email or any information that the return has been initiated.
I am seriously considering dismantling the printer and packing it up again.
RE: Failed Y-calibration of a new CoreOne
Guys, my calibration keeps telling me I need to check belt tension, but I put it 85Hz left, 87 right. Managed with your help to get brackets supported with cut out stripes of aluminum business card stuck under bracket holder, everything is now in level but yet it keeps bumping in that right corner and keep giving me this belt tension error. No matter what I do it keeps bouncing, bumping in top right corner hitting edges.
RE: Failed Y-calibration of a new CoreOne
Maybe to help others, all said in this post already, after adjusting brackets and getting all aligned, after belt tension adjustment it still didn't work giving me belt error, but I found post where somebody said adjust it bit more, I had 85 / 87, but I managed to put it on 85/86 or something like that and voila, printer works, printing my first thing, so far its all good.
RE: Failed Y-calibration of a new CoreOne
I just built my core one kit and ran into the Y-axis calibraton issue. I fixed my issue:
1: Back off all belt tenstion completely.
2: Pull the three M3x8rT screws off the rear right side of the gantry.
3: Add one M3 washer (0.5mm thick) to each screw between the gantry and the backet
4: Tighten the screws back up
5: Useing two hex keys, add belt tention back to both belts at the sane time. I noticed slop being introduced when doing it one at a time. I ended up over shooting to about 100Hz and backing off each side to 85 Hz ± 2Hz. passed the Y axis calibration immediately after doing this.
I do not think this is a QC issue from Prusa, I think its a process optimization issue. Less play when adding belt tension would be welcome but the i3 has been around for a decade plus, were only 3 months into the Core One.
RE: Failed Y-calibration of a new CoreOne
Glad to hear that you managed to get yours working 👍
I’m assuming that when you backed off the belt tensions, and moved the gantry fully forward and rearward, there was a noticeable gap at one side between the gantry itself and it bumping up against the stops?
If not, I’m curious what led you to try shimming the bracket?
If shimming is going to be a common solution for this issue, then Prusa really need to cover squaring of the gantry better in their assembly instructions, and maybe even provide suitable shims.
I am also surprised that such a tiny adjustment of the belts seems to mean the difference between a calibration pass or fail.
I just built my core one kit and ran into the Y-axis calibraton issue. I fixed my issue:
1: Back off all belt tenstion completely.
2: Pull the three M3x8rT screws off the rear right side of the gantry.
3: Add one M3 washer (0.5mm thick) to each screw between the gantry and the backet
4: Tighten the screws back up
5: Useing two hex keys, add belt tention back to both belts at the sane time. I noticed slop being introduced when doing it one at a time. I ended up over shooting to about 100Hz and backing off each side to 85 Hz ± 2Hz. passed the Y axis calibration immediately after doing this.
I do not think this is a QC issue from Prusa, I think its a process optimization issue. Less play when adding belt tension would be welcome but the i3 has been around for a decade plus, were only 3 months into the Core One.