3d print quality issue

[Anonymous]

Hi all. Complete beginner here so be kind please.  I have created a simple 3d model house ground floor.  As best i can tell there are no problems likely to prevent this printing well and i have run through some test diagnostics on print sites that confirm this.  I am having no other print issues printing other people's files on my Ender 3, but for some reason the result is super flimsy even using 0.1mm layer height and high % infill etc.  The resulting model literally flops in my hand and the it just doesn't look as though the pla has fused together properly.  I've searched the internet for tips but nothing seems to solve this.  I assume that i am doing something stupid at the design stage?  Does anyone have advice please or has experienced the same when first creating their own 3d print models?  I split the design in meshmixer to print due to size.  I have added photos of the design (floor1), the floppy print(image 1) and also one of someone else's stl file using same print settings(image 2) just to show it's not the printer itself causing it.

many thanks, JT

[wmhazzard]

The bottom of you model looks too thin. What was the thickness that you drew? Also what is the top and bottom layer thickness that you have set in your slicer?  I use 1 mm for the top and bottom thickness and also for the wall thickness. I don't use layer heights less than 0.2 mm. I find that using a layer height that is half of the nozzle diameter works best. 

[Anonymous]

thanks for the reply.  The sketch had all walls and floor at 4mm width.  For print settings I changed all to 1.2 mm to play on the safe side (or so i thought), after reading advice elsewhere.  I had tried the layer height at 0.2 previously but that was even worse (although i must admit at that stage i had print wall thicknesses at default levels).  I used the same settings as used here to print models from thingiverse and got good rigid prints with no bed level or adhesion issues hence my confusion with this floppy disaster, though clearly i have done something stupid somewhere.  I thought the design would be a nice safe one to cut my teeth on....

thanks, JT

[TheCADWhisperer]

Can you File>Export and then Attach your *.f3d file here?

Can you post image of your stl export resolution settings?

[wmhazzard]

If you can attach the f3d file of your model I could take a look at it and offer suggestions. 

[Anonymous]

thanks. the fusion 360 file is attached here.  as for the stl export resolution settings, the stl export seemed to be lacking any options in f360?  do you mean the print settings?  meshmixer was also used to split the part into 2 but that was a simple split  and export and again used default stl export.  thanks, Jon

[Anonymous]

cura print setting are:

Layer height 0.1mm (i also tried 0.2)
Wall thickness 1.2
top/bottom thickness 1.2
Infill density 80% (tried 20% originally)
Gradual infill steps 5
Printing temp 190 degC
Build plate temp 60 degC
Diameter 1.75mm
Flow 100%
Enable retraction - ticked
Print speed 90 mm/s
Travel speed 120mm/s
Print acceleration 500 mm/secsq
Travel acceleration 5000 mm/secsq
Print jerk 20 mm/s
Enable print cooling - ticked
No support
No build plate adhesion
Print sequence = all at once

[wmhazzard]

I think the problem is in your slicer settings, I think your speed is too high and your temperature is too low.  You are not getting good adhesion between layers.  I print with a CR-10 with PLA and I print at 0.2 mm layer height with a 0.4 mm nozzle, 60 mm/s print speed and 215 degC temperature. Infill should be fine at 20 percent for your model and your bed temp, floor and wall thicknesses are fine.  You don't need gradual infill for your model.  I have printed for hundreds of hours with my settings and have never had problems like that. 

[Anonymous]

thanks very much for the help, i will give that a try.  I still don't understand why the original setting would work for other prints fine but not for my fusion design, but i will try those suggested settings and report back!

thanks again,

Jon

[Anonymous]

thanks for your advice - I managed to get a print with those settings.  The walls, although visually ok, are very flimsy still for some reason.  the base is fine and i had 1.2mm set for both walls and floor so i'm unsure why this would be.  I know that cura has a vast amount of other settings - can you think of a reason why this would be?  The good news is that it's not likely to be my fusion 360 design causing the problem, since your suggest on temp and speed has clearly helped.

thanks,

Jon

[davebYYPCU]

Another thing, seems obvious, but settings for PLA, and not using PLA.

Might help....

[wmhazzard]

Like @davebYYPCU  says, try a different filament.  It is hard to tell why you print is not working without seeing it. Take a look under a magnifying glass to look for problems. 

[Anonymous · Accepted solution]

thanks again to all for the tips.  the setting was for PLA.  I fiddled with infill and skin settings on the slicer in the end and that was what finally gave me a rigid print.