3D Printing Threads - 3D Printed Thread - FreeCAD Thread Tutorial

I created working 3D printed threads, all created in FreeCAD!
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I printed all my test prints with a layer height of 0.1mm (100 micron) at about 10mm/second. Printing at 0.25mm (250 micron) resulted in too tight connections between the threads.
I started using the following default screw scaling settings: A0,990 and B-0,050. And the following default nut scaling settings: A1,030 and B0,100.
PRINTED OUTER M6 THREAD WITH METAL ONLY (STANDARD SCALE SETTINGS)
It seems that tightening an M6 metal nut on a 3D printed bolt or rod is done easily. Tightening a metal or 3D printed bolt on a 3D printed thread failed.
So 3D printed outer threads only worked with metal nuts when using the standard scale settings.
FAILED SLOW SPEED
An M6 nut 3D printed on a very slow speed also didn't work.
The printing speed was about 6mm/second.
WORKING BIGGER M8 NUT
Then i 3D printed two (bigger) M8 nuts with 3D Printer Compatible mode on. The nuts (bigger than M6) fit a metal M8 bolt very well: the first 3D printed inner thread that works.
FAILED BIGGER M8 NUT
I also printend an M8 nut with 3D Printer Compatible mode off.
That one didn't fit, so this was the first time i noticed any difference
between setting 3D Printer Compatible mode on or off.
The smaller M6 threads were printed on a wrong scale to fit at all,
also when 3D Printer Compatible mode was on.
WORKING M6 NUT
I changed the 3D Printer Compatible mode settings with another M6 nut.
Before, there were too tight connections between the threads.
Changing the nut scaling settings to A1,100 and B0,100 gave me a wrong STL file. I changed the nut scaling settings to A1,050 (default=A1,030) and kept B0,100 as default. It worked and the 3D printed nut fits well on a metal and scaled 3D printed M6 bolt!
WORKING M6 SCREW
I also changed the screw scaling settings to A0,970 and kept B-0,050 as default. This 3D printed screw works with a metal nut and a scaled 3D printed nut!
CUT OUT THREAD
I also tried to create cut out thread that works.
So i cut a screw (A1,010 and the default B-0,050) out of a cube to create inner thread in a solid. This didn't work. The connection was too tight.
Then i cut a screw out of a cube again. I changed A1,010 to A1,030. That worked well! A little tight, but good enough to use the thread with metal and 3D printed screws.
The tests were made on the Felix Pro 2 3D printer, so another printer (with other filament) can differ from my results. I used PLA instead of PETG, because PETG is more stringy. That could cause to fail the test prints a little faster. More info on the FreeCAD forum: forum.freecadw...
My 3D print settings for the blue prints:
blue PLA | 600mm/minute (10mm/second) | hotend 185°C | bed 55°C | 250 micron | infill 20% | 3 top layers | 3 bottom layers | 3 outline layers
fan 100% | brass nozzle 0.35mm | extrusion width 0.40mm | retraction 1.00mm | extrusion multiplier 0.87 | coasting 0.30mm | wipe distance off
This FELIX Pro 2 is recorded with permission from the marketing department of FELIXprinters. www.felixprinte...
This video was recorded in the stable release of FreeCAD 0.18 (2019-04-04). www.freecadweb...
👍 Thanks for watching the video 3D Printing Threads - 3D Printed Thread - FreeCAD Thread Tutorial
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