tag:blogger.com,1999:blog-4339813531032979196.post6371698193085210903..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Catalogue of disastersnopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-4339813531032979196.post-66367846533145903472008-10-25T01:57:00.000+01:002008-10-25T01:57:00.000+01:00A possible reason for the ABS leak causing the the...A possible reason for the ABS leak causing the thermistor to mis-read... <BR/><BR/>Substances undergoing phase change (i.e. freezing or liquid -> solid) will do so at a constant temperature. It probably caused the thermistor to cool off.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-23269360008474406172008-06-13T22:43:00.000+01:002008-06-13T22:43:00.000+01:00Marcin, I have been able to extrude PCL, PLA, ABS ...Marcin,<BR/> I have been able to extrude PCL, PLA, ABS and HDPE with the RepRap extruder with only minor tweaks to the design.<BR/><BR/>PLA probably works the best but there isn't a supply yet so I am using the next best which is ABS.<BR/><BR/>The target resolution for RepRap is 0.1mm accuracy, 0.5mm filament giving about 1mm minimum feature size. My RepStrap machine achieves that but the RepRap Darwin has some issues with firmware delays and extruder speed control which reduces the print quality. We aim to fix these with the lessons learned from applying my electronics and firmware to the Darwin I am building.<BR/><BR/>Fused filament fabrication is not very good at making threads but it is possible. I have a small salt pot made on a Dimension printer that has a screw thread. That was produced with 0.25mm filament I think but if the dimensions were doubled it should work on my machine, and subsequently on Darwin.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-69603447113695904552008-06-13T18:02:00.000+01:002008-06-13T18:02:00.000+01:00Is RepRap now working with ABS? What plastics is i...Is RepRap now working with ABS? What plastics is it able to work with as well? This is amazing progress since I last looked at the site, when polycaprolactone was being used.<BR/><BR/>What is the latest news on the accuracy that RepRap can achieve? I am highly interested in printing threaded fittings for custom plumbing applications. Is this feasible or does it look promising?<BR/><BR/>Marcinmarcin_osehttps://www.blogger.com/profile/05052032028273550909noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-47814787967392062842008-06-13T00:13:00.000+01:002008-06-13T00:13:00.000+01:00Hi david, Yes no sign of the Cerastil changing. T...Hi david,<BR/> Yes no sign of the Cerastil changing. The JB-Weld changes colour very quickly.<BR/><BR/>Making the heater safer can be achieved with some better firmware rather than an extra thermistor. I detailed the changes here http://hydraraptor.blogspot.com/2008/03/pros-and-cons-of-nozzles.html<BR/>but have been too lazy to implement them yet.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-16917213562650824612008-06-04T17:57:00.000+01:002008-06-04T17:57:00.000+01:00Hopefully Cerastil has better longevity than the j...Hopefully Cerastil has better longevity than the jbweld.Davidhttps://www.blogger.com/profile/01133135172662657874noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-74231734407184247232008-06-04T17:54:00.000+01:002008-06-04T17:54:00.000+01:00a couple thoughts for reliability and failsafe beh...a couple thoughts for reliability and failsafe behavior:<BR/><BR/>1.) Attach a second thermistor to the barrel further from the nozzle and heater. Determine a rough profile of the temperature difference between the two thermistors during normal operation. Allow the control software to shut down the heater if a n above threshold difference is observed.<BR/><BR/>2.) Differences in insulation, ambient temperature, airflow, etc will cause extruders to perform differently. Each unit should remain similar in temperature response rate between heater duty cycle and thermistor values. Sufficiently out of spec values could be used as grounds for halting the system.<BR/><BR/>3.) Add a smoke detector ;).Davidhttps://www.blogger.com/profile/01133135172662657874noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-20888087046308266512008-06-02T11:41:00.000+01:002008-06-02T11:41:00.000+01:00Hello nophead:Glad to see your 3D printer working ...Hello nophead:<BR/>Glad to see your 3D printer working again.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-21761203069902278802008-06-02T07:50:00.000+01:002008-06-02T07:50:00.000+01:00I so recognize the frustration! I had completed th...I so recognize the frustration! I had completed the RepRap Darwin quite quickly, but debugging problems and fixing things that broke and broke again is really tedious. Especially if it takes a week of trial and error. Hopefully getting the flex drive out of the equation will make it a stable setup. I did the same after a lot of debugging, but I had no impressive results in between. Then again, you're at it for longer. Besides the fact that you're brilliant at this!<BR/><BR/>Your printer gets quite some printing time also because you have a print queue/spool. I think making a print queue is a VERY important thing to have, congrats are in place for that alone!<BR/><BR/>I think that you're starting to reap the benefits of all your efforts. <BR/><BR/>You're really making tangible evidence that the RepRap dream is becomming true!Erik de Bruijnhttps://www.blogger.com/profile/09433438819279256757noreply@blogger.com