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Moving parts sticking on prints


phipps379

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Posted · Moving parts sticking on prints

Hi There

 

Im new to the 3D printing world and have started with running a few test prints i have found off Thingiverse. I am able to print anything except moving parts. I tried printing a tolerance test found on thingiverse that has different tolerances ranging from 0.1mm to 0.6mm. All of them stick. Do you have any settings i can look over in Cura to combat this?

 

Im printing off a Creality Ender 3 V2 with PLA. Bed temperature is at 56 degrees as per manufacturers specs on the box of PLA and the nozzle temperature is at 200 degrees C. 

 

Ive attached stl. file of print to give a fuller picture.

TOLERANCETEST.STL

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    Posted · Moving parts sticking on prints

    Print in place parts are always a tough task for any printer. Fortunately Cura (at least the newer versions) has an adjustment that can really improve dimensional accuracy. You may have to search and turn them on, but I know they are available when "Expert" settings are selected. There are 3 of them, and all can be found by searching "expansion".

     

    Horizontal Expansion is the first of the 3. This adjust all polygons in a layer to "shrink" or "expand" them. Negative values will bring polygons in towards the meat of the part (smaller outer dimensions, larger inner dimensions). I have this set to -0.125mm.

     

    Initial Layer Horizontal Expansion is next. This functions the same as the first setting, but only on the initial layer. I have this set to -0.2mm to get rid of "elephants foot".

     

    Last is Hole Horizontal Expansion. This is another similar setting but only applies to "holes" in the part. This setting also is valued inversely, so positive values give larger inner diameters, and negative values will shrink holes. I have this set to +0.15mm.

     

    These settings give me the best dimensional accuracy that I have found. I am usually within +-0.1mm tolerance. These settings may or may not work with what you are trying, but will give you a starting point. With a pair of calipers and some calibration models, you can adjust from stock, or from these values as needed.

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