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OpenSCAD crashes with twisted linear_extrude

3

**Describe the bug** OpenSCAD crashes when using custom $fn value with code below when using circle instead of square all renders well: ``` module spiral(height=150, radius=25){ linear_extrude(height=height, twist=-360*4){ translate([radius-5,0,0])square(5,5); }...

ntpd clock source

3

Hi awesome project! Does this usb-rtc dongle could be used as NTPD clock source And another question about using LIR1220 - does it recharges while connected to PC