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Slicing small gear

Posted: Sat Feb 14, 2015 1:56 pm
by mwu
I have a very small double gear I am trying to slice.
Screen Shot 2015-02-14 at 1.51.22 PM.png
Screen Shot 2015-02-14 at 1.51.22 PM.png (17.98 KiB) Viewed 3351 times
The larger portion of it comes out fine. The smaller portion is sliced with just the teeth, not the hub.
Screen Shot 2015-02-14 at 1.51.48 PM.png
I have tried increasing the size of the hub slightly, but I am not sure how much I can increase it before it won't mesh anymore. Are there any settings that might help? I have attached the stl file representing the gear. I can also upload the openscad file if it'll help.

Re: Slicing small gear

Posted: Sun Feb 15, 2015 11:21 am
by JoeJ
The real problem here is probably that your nozzle is too large to print tiny features like this. But if you still want to attempt it, you can probably lower your extrusion width until it is capable of printing it. Set your extrusion width to 0.2mm and I bet it will include the hub (although it probably won't print well unless you have a really small nozzle!)

Re: Slicing small gear

Posted: Sun Feb 15, 2015 2:51 pm
by beerdart
It appears to slice fine for me. What are your settings?

Re: Slicing small gear

Posted: Sun Feb 15, 2015 10:07 pm
by jimc
beerdart, look at the grid. see how big yours is compared to his. did you scale it up?

joe's analysis is pretty much spot on.

Re: Slicing small gear

Posted: Mon Feb 16, 2015 8:48 am
by AndersE
0.35 extrusionwidth seem to be the limit.

Re: Slicing small gear

Posted: Tue Feb 17, 2015 10:44 am
by mwu
Thanks for the tips. In order to get that ring, I had to drop my nozzle width so low that the print quality suffered a lot. I was able to get some gcode that worked well for the small gear off of another slicer, but the larger gear wasn't as good. I may just manually combine the gcode for the larger gear from S3D with the gcode for the smaller gear from whatever slicer I had used before (can't remember now).