tag:blogger.com,1999:blog-5483471752664961069.post3336843722218707196..comments2023-12-22T09:21:35.599-08:00Comments on RepRap Log Phase: The Makerbot Mk5 Extruder has exited the BotcaveAnonymoushttp://www.blogger.com/profile/14841570845002675047noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5483471752664961069.post-80756125155232321312010-08-21T09:04:11.407-07:002010-08-21T09:04:11.407-07:00I'm already thinking about ways to incorporate...I'm already thinking about ways to incorporate some of the features into a no-lathe-required design. Some of it just confirms what I was already thinking would be a good way to do something, but there are a few pieces of this that might help me.<br /><br />I was confused when I saw how low the resistance for the power resistors (wired in parallel!) was, until I saw that they were using the relay board. With a standard mosfet-powered hot end weighing in at 6 ohms, if you backed off from the 2.5 ohm resistors in this to 3 ohms, you could make the relay optional, just wire it in series for direct mosfet power with a slower heat-up.<br /><br />I also like the idea of connecting the heater block to the extruder body without using the barrel as a structural part. If you could keep the cold end of the barrel cool enough to not soften the plastic, you could even have a significant air gap between it and the extruder body. Nophead has suggested that a short hot zone is preferable, and this has led me to the idea of a heater block that couples with a bowden cable directly, no barrel required. To use this heater block with a carriage-mounted extruder, you would just need a 1-2" piece of the bowden cable tubing.<br /><br />One thing I really like is the male-threaded nozzle. I have been wishing for this for a while, and it's the real reason that I may buy one of these hot end kits to experiment with. I'm anxious to see what Makergear's response will be to this. If they start making parts to be used with the MK 5, it will be a nice new breeding ground for hot end designs. I always thought nichrome was kinda stupid, and have hated it since I first saw Nophead's post about the power resistor heater. What I really want is a nozzle machined directly into the aluminum heater block, though I've determined that the bevel around the hole is necessary, which would make that a lot more difficult (lathe definitely required, and one with a four-jaw chuck). The male-threaded nozzle is a nice compromise.<br /><br />Also, with all of the problems I've been hearing about (including some of my own) cause by poorly-hobbed bolts in Wade's extruders, I'm eyeing that MK 5 drive gear for a possible redesign. Anyone have the measurements for that? The dimensional drawings I can find all have the dimensions left blank!whosawhatsis?https://www.blogger.com/profile/12792264289634575186noreply@blogger.comtag:blogger.com,1999:blog-5483471752664961069.post-12585713513188854022010-08-20T19:06:34.570-07:002010-08-20T19:06:34.570-07:00Anyone want to place a bet on how long be knock of...Anyone want to place a bet on how long be knock off nozzle and extruder parts are going to be available on Ebay? :)<br /><br />It took 2 weeks for knock off wormgear to show up ! http://cgi.ebay.com/Reprap-Bronze-Threaded-Pulley-/180539917273?pt=LH_DefaultDomain_0Anonymoushttps://www.blogger.com/profile/14841570845002675047noreply@blogger.comtag:blogger.com,1999:blog-5483471752664961069.post-82484457060621579512010-08-20T18:54:15.465-07:002010-08-20T18:54:15.465-07:00this is a very good thing to see, i think this wil...this is a very good thing to see, i think this will be one of the bigger stepping stones for this project has a whole.Anonymoushttps://www.blogger.com/profile/11988319309314632650noreply@blogger.com