jpm021990
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Posts posted by jpm021990
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FYI, its not the model, other prints are doing the same thing at the same height and I've printed this model successfully multiple times before
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Just recently my 3D Prints have been splitting in the same location every time, I've checked the bed leveling and greased the bed axis.
I'm printing with HIPS at 220c at 30mm and 40mm print speeds but it still is splitting in the same locations
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6mm is crazy off.
Is it possible one or both of the parts are warping off the glass bed? If you don't do everything properly the part will pull itself off the glass at some point. Once that happens all bets are off.
Other than that guess, I really doubt the problem is with the printer - I mean does the printer sit flat on the table? Or does it rock? Does it look like a parallelogram when viewed from above?
More likely something went wrong with the scaling step or the split step or the model is bad.
I'd check if the 2 halves line up *before* printing. Maybe check the gcodes and measure by counting the 10mm squares on the print bed in cura. You should be able to see the error there.
WOW
You're totally right, one of the bars across the top is actually at an angle, about 6mm too. How can I fix that?
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Thanks for the files, if I don’t look at them today, definitely tomorrow.
To my mind there is no one simple answer as it does depend on the combination of layer height and infill %.I do not think of it in thickness, I think of it in terms of number of layers, which then of course has to be converted to a distance. I often use 40% infill, which in relative terms is quite solid. With 0.3 layer height I will use 3 layers . If I were using 0.1 layer height I would put down 4 or 5 layers. With 20% infill and 0.3 layer height I would use 4 layers; with 0.1 layer height I would put down about 10 layers minimum.
The problem with sparse infill is that your first top layer will fail and even more so with a thinner layer height. The next layer will recover the position to some extent but probably not 100% even with 0.3 layers and you may still have a mess which will still need at least one layer but probably two to get rid of and give you a smooth finish. With thinner layer heights you get a greater mess on the first pass because the thinner layer just does not cover the gaps as well as a thicker layer and you need a lot more layers to get the get the job done. Obviously if printing something with a large base, say 10*10 inches, then it makes sense to try and get away with the minimum as each layer can take a considerable time to print.
If you have a large model and are not sure, then you can test it by using the Cura parameter “cut off object bottom” on the Advanced tab; you can set the distance appropriately so that you just print the upper layers. It is a long time since I have done it but I think if you also un-tick “sold infill bottom” on the Expert settings you will get the first layers you print as infill, so the whole thing does not need to take very long to print.
Ok I just changed some of those settings and printed it but still with the same result (I also scaled it using a different method than Cura as per another suggestion) but it came out exactly the same. I'm looking forward to what you uncover in your test print.
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OK. Just as a hint, personally I think .8 /4 layers for bottom/top thickness with 20% infill is a bit marginal. Strange one this; I would urge you to print something else of known dimensions and measure it. You do not seem to be doing anything substantially wrong but the printer would just not normally have that enormous margin of error. Do you want to post the two models somewhere so I can have a look and maybe print them?
The other half just finished printing and its exactly the same as the previous one. I'm really at a loss for this. What do you recommend for bottom top thickness and infill?
Here are the 2 different ones I tried, the first one I cut it myself using netfabb, the 2nd one was already pre-cut, but the same thing happens for both
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Extreme longshot: Which version of cura are you using? Are you using the "next generation" with the new interface? If so, maybe autoscaling could be the culprit? It seems extremely unlikely since the print doesn't look all that big and I would think cura would scale both pieces equally to make them fit if that was needed.
Cura 15.04.4
I actually had to scale them both to .8 of what they originally were to make it fit on the build plate
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Robert commented that you had under extrusion and he may well be right but I am wondering if that poor surface is due to pillowing. Did you swap from ABS to PLA and forget to set your fans on? What % infill are you using and what layer height and bottom/top thickness do you have?
Nope I set the correct filament type. 20% infill, .8 bottom top thickness, 1.2 shell .2 layer and 45mm/s print speed
I fixed the issue where there was a little pillowing, that picture was a bad one to choose, I have another half that I printed that looks physically perfect but still the same amount of offset when you try to put them together
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PLA/ABS, OK :)I was thinking about your problem. If your printer IS dimensionally accurate - refer my last comment in previous post then my view is that it is impossible to be out by 1/4" / 6mm. Maybe a few hundred microns but not 6000 microns. 1st three pics are of two pieces I printed yesterday, laying one on top of the other - 17cm just under 7 inches wide. The fourth pic demonstrates a 1/4" 6mm error.
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In my view that is IMPOSSIBLE. Either you have something physically wrong with your printer and it is dimensionally inaccurate, or, something is wrong with the two models and they are not dimensionally the same. Or whatever slicer you use is cr*p - I use Cura.
With 45mm/s you should be getting within 100 microns.
Just love Agents of Shield btw
I use Cura as well. I'm trying to take one of the halves and mirroring it using Cura now instead of printing the models separately. I'll let you know how it goes. Its so weird because most of it lines up but the whole thing will not
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Wondering why you are doing regular atomics? I am sure everyone is different but I did my first one for about year yesterday and only because I was changing from orange to black and being lazy. To me if you are doing them regularly then you are either switching between different types of filament regularly (I do not) or you have an issue somewhere.
I just say that because it is difficult to work out what is going on.
I do them regularly because I switch from ABS/PLA often, its more of a precaution. The prints themselves look absolutely fine. You can totally ignore the first picture. I printed with faster settings and less infill. I'm really at a loss for this too because I've tried with the full design and splicing it myself and using the already spliced one with the same result.
Here's a totally different design where the same thing happened. On the top its totally fine and then the bottom half just wont align. Or if I align the bottom the top doesn't line up
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I am printing ColorFabb Dutch orange at 50mm/s, .300 layer and 205c extruder. I would say your 215c is too hot and that maybe that is affecting your dimensions. Somewhat of a guess but 1/4inch out is a LOT.
I'll try with 205 but I don't think it would make too much of a difference. My only issue with the printer is when lining up spliced pieces
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1/4in is ~6mm to save some time for those of us who don't count with our fingers and toes
And yellowshark is right, that's a very large error in dimensions. Are you sure the two halves line up digitally as well? Have you tried printing a circle, is it an actual circle? Have you tried printing a square, is it an actual square?
Also, you're underextruding quite heavily. Try doing a few Atomics and/or replace your PTFE coupler if you've been printing for a long time.
And it looks like you don't have enough top/bottom thickness to close the top properly. It could also just be because of the underextrusion.
My circles and squares come out perfectly. I've tried with 2 different designs for the gun and they still have the same result
I realized i did the wrong settings for the first picture why it looks so bad, the other side looks a lot better because i changed the settings.
My PTFE coupler is new and I do regular atomics.
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Hi guys,
I have a Ultimaker 2 and I'm trying to print a couple of spliced designs that were cut down the middle for easier printing. The problem I'm having is that after both sides print out the object does not align with the other half. It happens with pretty much every design. I would be okay with a minor overlap but this is about a 1/4" around most of the print.
If I align the top perfectly then the bottom does not match. I'm not sure why this is happening as other people have used the same design without any issues.
Any thoughts/comments?
Printing with Colorfabb Black PLA 215c 45mm/s print speed .2 layer height
(Picture is the night night gun from Agents of Shield)
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no, this one is fairly new
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Are you using the same filament (same spool) as when you were getting good prints?
Yeah same filament spool, I keep them in a dry box when not in use, airtight with silica packets.
Update: printing slower seems to be working. I was always able to print this thing at 70+ mm/s so still trying to figure out what happened
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First of all it is best to print with 2,85mm. Printing with 3 can cause some trouble. If you want to print with 3mm anyway you should play a bit with your flow rates. Here you can clearly see sometimes it under extrudes and sometimes it over extrudes. You should try a different flow rate, experiment a bit with it. I would try printing with 2,85 filament to try if the problem remains. Also could you give me your layer height print speed and shell thicknesses.
Most 3mm filaments are 2.85mm. Especially from high-end manufacturers like Colorfabb.
I realized I said 3mm by accident when it actually really is 2.85
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you may want to slow it down a bit. Like 50mm/s or even 40mm/s
Ok Ill try this
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It could be but if it was installed properly then it should be fine if its only a couple of weeks old.
What print speeds and layer heights are you trying to print with?
Same thing I've been using for every print the last couple of weeks
0.2 layer height
20% infill
80mm/s
.4mm nozzle
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Did 4 atomic pulls and they were all clean and looked exactly like the picture with the bulb shape.
Could it be the coupler or the nozzle itself? I just replaced the coupler a couple of weeks ago along with the nozzle
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Looks like underextrusion to me. Start by trying a few Atomics and see if that helps.
I'll try that
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First of all it is best to print with 2,85mm. Printing with 3 can cause some trouble. If you want to print with 3mm anyway you should play a bit with your flow rates. Here you can clearly see sometimes it under extrudes and sometimes it over extrudes. You should try a different flow rate, experiment a bit with it. I would try printing with 2,85 filament to try if the problem remains. Also could you give me your layer height print speed and shell thicknesses.
Sorry I meant 2.85, I'm just always used to saying 3. The colorfabb filament is 2.85 with a very high accuracy of it
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I'm using an Ultimaker 2 with Colorfabb PLA 3mm filament printing at 210 and 220c but still get this same result. Missing and jagged layers.
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I'm having this same issue as of today. Printer was working perfectly before today. I've noticed when loading filament the feeder motor clicks and struggles to push filament through during normal Loading 2.85mm PLA Filament being loaded.
Once it gets loaded it prints out inconsistent layers
Two points
I wonder whose filament you are using? Poor filament can cause the problems you are experience, i.e. poor/cheap filament will likely have inconsistent filament widths and once you go beyond 3.0mm in real-time measurement problems will start. Then the filament goes back to under 3.0mm and everything is fine until another length of filament with a wide diameter arrives...
Suggest you get a micrometre and measure, at frequent intervals, the length of filament you will use for the print.
Or your filament is stick on the reel - suggest you unwind the filament (the length you need for the print), from the spool and leave tidily on the floor or desk to avoid this.
Failing that you have a partial blockage/rubbing/component failure somewhere in your filament feed path.
I use colorfabb filament and I have been for a long time and printed without any issues through multiple prints that have come out perfectly. I have a micrometer and it measures from 2.84-2.87 consistently throughout the filament and I haven't touched the filament or the settings
Splits in 3D prints at same locations
in UltiMaker 3D printers
Posted
Any thoughts, tried increasing temp to 230 but still nothing