Hello.
I am having trouble printing overhangs on one particular part. The printer for the most part prints quite well. The part is quite large, takes about 6hrs to print (.5mm nozzle, .3mm layer height, 70% infill) and it is frustrating to have to print it again and again (time and cost of filament adds up).
Here are some pics of the issue.
https://drive.google.com/file/d/0B2nobe1HZXsEallUdnhVYkJZdHM/view?usp=sharing
https://drive.google.com/file/d/0B2nobe1HZXsEU0lxQjNrRXR0R0U/view?usp=sharing
https://drive.google.com/file/d/0B2nobe1HZXsEWmltQ0ZBNFh3a3M/view?usp=sharing
Here is a link to the .stl of the part in question http://www.thingiverse.com/download:1196548
Sorry for the average pics, I only had my phone handy.
Any suggestions for trying to rectify this issue? Would more effective cooling help?
Many thanks for your time.
Justin.
You can try to reorient the part before printing or use support material.
Generally Overhangs print better (while still tricky) with LOTS of cooling.
Hi ichbinsnur.
Thanks for the feedback. Reorienting the part is not an option sadly. Its quite complex and there is only really one possible way to print it. I’ll try and set up a better cooling solution.
The printer is now in pieces for a z axis upgrade and some other small tweaks. Once I get it back together I’ll look into a suitable cooling shroud and fan set up.
What is your thoughts on this cooling solution? Good idea, or overkill?
http://www.thingiverse.com/thing:160252
I tried that before myself. I found it a bit bulgy and not very efficient.
That’s why i came up with this : thingiverse.com/thing:1022249
Maybe give it a try.
That shroud looks.great. Nice design work! I’ll give it a try.
Thanks.
Just a quick question ichbinsnur.
I printed your fan shroud/mount and encountered a small problem. The nozzle_holder_v2.stl printed correctly (everything lines up to attach the standard velleman fan), but the Fan.stl printed at an odd size? It does not match up to the other parts and does not fit to the standard fan.
Was it something I did wrong? I did not scale or re size any parts.
Any advise you could give me?
Many thanks.
Justin.
Update.
I measured the size of the parts, and calculated the difference in scale.
If we consider the size of the Fan.stl to be 100%, the size of the nozzle_holder_v2.stl is 80%
I reprinted the Fan.stl (only the bottom 5 layers) @ 80% scale and now it fits the other parts, and the standard velleman fan perfectly.
I will now reprint the entire Fan.stl @ 80% scale to solve the issue. Perhaps you could make a note on your thiniverce parts files so others do not also run into this problem.
Cheers.
Justin.
[quote=“PurpleMonkey”]Update.
I measured the size of the parts, and calculated the difference in scale.
If we consider the size of the Fan.stl to be 100%, the size of the nozzle_holder_v2.stl is 80%
I reprinted the Fan.stl (only the bottom 5 layers) @ 80% scale and now it fits the other parts, and the standard velleman fan perfectly.
I will now reprint the entire Fan.stl @ 80% scale to solve the issue. Perhaps you could make a note on your thiniverce parts files so others do not also run into this problem.
Cheers.
Justin.[/quote]
Thanks for the hint.
I will have a look at it. Maybe i have uploaded the wrong STL for the fan part.
It took me some tries to get the “shroud” fit reasonably. 
Has anyone of the other users encountered the same problem?
If so, please let me know.
No problem. The parts are excellent otherwise. The shroud printed well @ 80% scale. I did need to open the 4 mount holes slightly (a small drill bit by hand) for the screws to fit. Otherwise I’m very happy with the final assembly. Light years ahead of the standard Velleman solution. Thanks for sharing you design.
I have just started a first print with the new cooler assembled. I have also dropped the hot end temp to 185deg C, to see if that helps. I’ll post the results of the overhang in the morning. Don’t you love those 6hr+ prints lol.
Hi There Ichbinsnur
Yes I had to resize as well to fit the original fan. I thought it was just my mistake. Glad someone else had the same problem.
It’s still a great design though!
Peter
