electronic_matt
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Posts posted by electronic_matt
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Probably. If you multiple the layer height .2 times speed 50 times nozzle width .4 you get 4mm^3/sec. Some printers can reliably print up to 10 or even 12mm^3/sec at 230C but 5 or 6mm^3/sec at 230C is probably around the max I recommend. And at 220C that drops quite a bit - maybe only 3mm^3/sec.
So you are near the upper end or at least within 2X of the upper end of print speed for this layer height and temperature. I recommend you either do thinner layers or slower speed or higher temp. 240C is a fine temp but I wouldn't go over that. Really best is to just slow down the print speed leaving layer height and tempt the same.
Also possibly you aren't using the default of 2.85mm for filament size? Are you using 3mm in the PLA settings on the printer? Or 2.85mm?
The intercooler was printed at 0.1mm layers, 210c and 20mm/s but still had some gaps between the layer lines, the first intercooler I printed looked a lot better and I used the same settings
The blind bracket was 0.2mm layers, 220c, 50mm/s and this is where the line gaps seemed worse, so it's all about balance really and how much material it can put down
You don't think this is any mechanical problem then like belt tensions?
I'm using the filament that came with the printer, the 2.85mm PLA blue, settings set to 2.85mm
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Nico,
Did you manage to fix this problem?
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on most of the layers on the intercooler the lines were not touching
I snapped a bracket on my blind last night so decided to make a new one, works brilliantly! I am loving this Printer, just a few small problems to over come along the way I guess
There were a lot of lines not touching on this print, I had to revise the design after the print shown below as I needed a square hole in the centre and not a round one to stop the blind shaft from rotating and the blind just dropping down on it's own, printed this at 0.2mm layers, 220c, 60c bed, 50mm/s, fill 50%, this was after tightening the small belts, is this under extrusion?
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The blue tool path is just the head moving while not pushing material. If retraction is on it will retract material at the same time.
You need to see the grill lines in red like in my screen shot.try setting the nozzle to 0.3mm and do a test print (you can cut off 2.5mm if you want)
Just did another print and the layer lines were not touching, so I loosened the stepper motor screws and pushed them down and retightened, managed to round off one of the hex screw heads, I'm not keen on hex screws, I'd like to change those to normal screws, do you happen to know if they are M3?
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Think I may have nailed it
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It shows the tool path and the grill layers and still printed flat on top, and the one with the indent is also weird, why would it totally ignore the grill lines and just did the indent part
Just loaded the file I shared in to Cura, if I look at layer view without scaling it up, it shows the layers for the grill lines but no tool path, if I scale it up my 2.0 it then shows the blue tool paths
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Feeder ticking is normal. Never print before checking on layer view. That would have shown filled in grill. To fix grill unchecked all fix horrible settings.
I did check the layer view and it showed the grill layers but still printed that face flat, and on another design it printed an indent but didn't do the grill lines, as shown in my previous small test prints, still can't work out why
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Everything is the same, apart from one thing, the top and bottom layer thickness, mine was on 0.3, may be this is why it cut off the top and made it flat on mine, it didn't go high enough?
Your slice image looks the same as mine.
I did scale it up a little when printing mine, as it wasn't quite the correct size that I needed.
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dont mind the brown residue and filament crossing the print. I was printing bronze fill just before, didn't clean the nozzle and forgot to reenable retraction :S
I cut off 2.5mm from the print just for the test. Mine got all the grill lines on top even the 2 that are smaller near the end. Your picture show 3 tests and the one in front seems to have them too. Is it something else I should look at?
Make sure nozzle size is set to 0.4 because there is no space for any other infill to go between the lines. At 0.6 the slicer just ignore them completely resulting in your middle print.
You could probably consider making them a bit wider to make sure the nozzle have enough space there.
How did you do this? haha
Nozzle was set to 0.4 just doubled checked
The one in my test prints where it shows the grill lines is a different file, the one I shared is the one I'd like to print so that the grill lines are flush with the top surface
Are you using Cura or some other software? if you are using Cura then you must have different settings in there than mine
Thanks for taking the time to help me, I appreciate it!!
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Otherwise load it in netfab (fabb?) and see if it give any error. Try repairing and exporting it back to stl or obj
Tried netfabb, still doesn't print the grill bit
Here is the stl file
https://www.sendspace.com/file/n42yas
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Still can't get the front grill right, I did some different designs, but none came out how I'd like it to be
when doing the grill area I drew a retangle pushed that down into the front face, then drew lots of lines across that retangle and pulled them up to create the grill effect, when I printed it, it was just flat on the top, so I then tried to make the grill part seperate and join the two parts together to make one solid component, printed that and still didn't work how I wanted it, I must be doing something wrong in sketchup, should I be working it metres or mm? if I work in metres I will need to scale it down in Cura
did these small prints below just to test, one has an indent and none of the grill lines printed
can anyone help before I rip my hair out? :(
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Make sure you look at the model in Cura's layers view. This shows the actual toolpath from the generated gcode. Sometimes the slicer which is a separate process will remove small detail. Due to the separate process, only the layers view shows this. The other views aren't aware that the slicer removed part of the model.
It shows the top grill in layer view, I think the problem is, cure is treating that whole top layer as one thing, and when I printed the first one, the top and bottom layer thickness was greated, and that's why it just about managed to print a bit of the grill on the first one. I think I need to make the grill as a seperate solid component in sketchup and join that to the main part, I think haha
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Speed is low, no sign of under extrusion in the print so I wouldn't worry about that sound. I get that sound to every now and then.
It can occur the feeder does a clicking sound and spin backward. If that was the case it would mean your printing too fast for the temp you use. If you print faster, raise the temp too so the nozzle deal with what the feeder is pushing.
Ok will do
thanks, next job is trying to work out why it didn't print the top grill part, just looking at the files at the moment -
Please post your print settings. Speed, temp, layer height, used material...
30mm/s, 205c, 60c bed, 0.1mm layers, initial layer thickness 0.3mm, ultimate blue pla
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Changed the design and changed some settings and seems to be a much better print, but it did not print the top grill part, how weird! must be something wrong with my stl file hmmm
Also has a pretty much constant ticking sound when printing this, I'm sure it was coming from the feeder
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Try setting the max fan to 0.5mm instead of 5mm. On your UM2 go in material , settings customize and make sure the material flow is at 100%, diameter should match the size of your filament (2.85mm by default) and Fan at 100%.
Ok will try that, thank you
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Have you tried just decreasing print temperature?
Is your fan 100%?
I was printing at 200c, bed was 70c, speed 30mm/s, weird really as I printed a phone case before this and it printed fine, may be it's my design that's a bit strange, I've done a revised design so will try that
I have fans set to come on at 5mm 100%, do I need to adjust this?
Whats the best option/s to reduce over extrusion?
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Wow thats quite a big difference between the model and the print. Does the layer view reflect the print or the model?
I'd say yes the layer view does reflect the print, apart from the top edges, with the layers sticking out
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Can you show a screen shot from cura showing the model in normal view?
It doesnt need to be a wide overhand. Even just a 30-40 degree angle outward is enough to cause warping if too hot.
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From a quick look they seems to be overhang. Overhang parts need to cool down extra fast otherwise they may warp upward. Make sur fan speed is at max and dont print too hot.
There was no overhang on the top edges though but still seems to stick out
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Thanks very much for the replies, I will give those ideas a try, I like the idea of printing the cylinders separately and gluing them in to holes on the main part.
Can I ask, why do the top layers also stick outwards at the egdes?
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Have a read through this, loads of really helpful hint and tips http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#underextrusion
Hi Bez, I have been reading that guide already, very useful!
I was wondering if I can improve the end cylinder parts by design improvement instead of may be tweaking printer settings alone?
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I am wondering how I can improve this print, this is the first thing I have designed myself and then printed, it is a small intercooler model for my RC car
Looks ok from the top, but the end round bits are not too good at the lower half, they were bending up during printing, a bit like the ultimaker robot ears seem to do sometimes, the first layer is squashed out due to the bed level, but the top layers seem to stick out at the edges as well? my main concern is how to get the end cylinder bits to print properly?
Also the bottom looks a bit weird as well, may be under extruded?
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Still have a fan problem, I am printing something as I write this, one fan started spinning very slowly and the other one was not moving, I waited for a few mins, still not spinning, so I pushed it around with my finger and then it started spinning on its own, does this sound like a faulty fan then?
When I test when with the fan speed control on the menu they seem ok
How to improve this print?
in Improve your 3D prints
Posted
The lines are reaching the shell ok
Thanks for the graph link, that is useful!