Here's a 3D printer manufacturer that decided to skimp on the failsafes. They figured that their proprietary software and insisting that the printer be sent back to fix *any* problem, including clogged nozzles, would suffice. (Somebody didn't read about the Therac 25. Should be mandatory for anyone doing *any* kind of software controlled hardware, of any size or deadliness potential.)
This owner unclogged the nozzle himself and forgot to re-tighten the fastener on the heater cartridge. It fell out and the software wasn't programmed to sense the extreme discrepancy between commanded and sensed temperature. Hello, thermal runaway. Most open source 3D printer software has that safety function in case of heater or thermistor malfunction. http://hackaday.com/2016/03/21/ask-hackaday-mrrf-edition-3d-printers-can-catch-fire/ From: Jon Elson <el...@pico-systems.com> To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Sent: Tuesday, March 22, 2016 9:40 AM Subject: Re: [Emc-users] Linuxcnc on arm On 03/22/2016 05:15 AM, bari wrote: >> E-stop should be handled with a hardware approach. Especially so! How else will you stop the machine when the batteries in your phone run down and you lose the cell connection? Obviously a more serious concern when running a 20 ton machine tool than a desktop 3D printer. Jon ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
