tag:blogger.com,1999:blog-4339813531032979196.post8592269777825478986..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Thoughts on raftsnopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-4339813531032979196.post-17448144364647381572009-07-30T23:56:34.181+01:002009-07-30T23:56:34.181+01:00Hi Chris
You might want to repeat toFlecther;s ex...Hi Chris<br /><br />You might want to repeat toFlecther;s experiment with a heated washer plate 1mm back from the tip to control warping.Fredshttps://www.blogger.com/profile/08092731901892918338noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-3694735989728168692009-07-23T16:50:11.050+01:002009-07-23T16:50:11.050+01:00Erik,
Yes the objects have more stress in them wh...Erik,<br /> Yes the objects have more stress in them when they are held flat by the raft. They curl a bit after they are removed, even if they were held completely flat while building. <br /><br />I am currently converting a small oven into a SMT reflow oven, so when I have that working I will try putting the object in the oven while it is still on the bed and putting it through a heat cycle up to Tg. That should releive the stress.<br /><br />No I don't use Skeinforge for anything other than the filament path.<br /><br />Have a good holiday.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-17754832903226126602009-07-23T16:42:17.031+01:002009-07-23T16:42:17.031+01:00Hi Matt,
I can't fit a bag over my mac...Hi Matt,<br /> I can't fit a bag over my machine because the base of the extruder rises past the bottom of the z-axis, so the beg would get torn off. I will be trying a heated bed though.<br /><br />I think the only way to make objects past a certain size is to build in an oven, as commercial machines do.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-45598259697925857882009-07-23T16:32:00.465+01:002009-07-23T16:32:00.465+01:00Thanks for the write up. You've been really th...Thanks for the write up. You've been really thorough! I had the same issue with a two layer raft, that it sticks best to the object instead of the raft layer below it. A three layer raft is probably worth the investment for bigger objects, I have been too impatient while not knowing that it was almost essential to having a good raft.<br /><br />While you're still fiddling with the rafts, they really do work. In your pictures the objects are really flat. That gives me confidence in you rafting strategy. I assume that there still is significant internal stress in the objects? I've been thinking about keeping the object heated A couple of times, I actually used a hair dryer during the making of the raft and first layers, but I'm not sure if that helped. It worked for Adrian... I've also tried upping the room temperature uncomfortably high, but besides me sweating a lot, made the controlling laptop crash in mid-build. I'd have to recommission my SD card module...<br /><br />You had some script generating the rafts for you, right, or do you use skeinforge for it now? Otherwise it would be nice to diff the skeinforge settings and see where the exact differences are.<br /><br />When I get back from my holiday I'll try your raft strategy and see if I can start building bigger objects!Erik de Bruijnhttps://www.blogger.com/profile/09433438819279256757noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-36341063488988920652009-07-23T16:25:18.993+01:002009-07-23T16:25:18.993+01:00Hi Nophead,
Have you considered trying Adrian'...Hi Nophead,<br /><br />Have you considered trying Adrian's idea with the oven bag? If it prevents warping, you might be able to go with less raft.<br /><br />MattMatthttps://www.blogger.com/profile/02997513426580324531noreply@blogger.com