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This means that when you lay down the first layer everything is fine, as the layers build up, the bottom layers start to cool (the hot end is no longer heating the bottom layers through conduction through the built part.) this means that the bottom starts to shrink and contract, without good adhesion this can mean that the part can come completely off the bed. The contracting action is especially concentrated at corners, (as the contraction is happening in effectively two directions, whilst on a flat side the contractions happen really only towards the centre.) Warping and curling of parts is something completely different from issues of grab, the warping an curling is exhibited because plastic expands as is get hotter and contract as it cools. if you have trouble getting the print to stick (at all) then try printing a raft, this is basically a huge mess of plastic laid of the bed to hopefully find some kind of "grab" to stop the parts moving around. In a lot of ways you only need a few points of adhesion, just enough to stop the part moving.
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the blue tape is only for use with non-heated beds because it'll melt if it gets hot.īoth the kapton and the blue tape supply a surface that the extruded plastic *should* stick to. The reason that you use Kapton is that it can withstand the heat of the bed. if not, ill have to wait till mine comes to try this out. If one of you guys think is a good idea and willing to try that'd be cool. when done printing, just grab the over hanging tape and peel the whole thing off and break the part away from the raft. The tape can be applied to the bed in strips to cover the bed with extra hanging over the front edge (so when the part is done printing it's easier to grab and peel off rather than trying to scrape it off.) A raft could be printed on top of the tape so the uneven surface of the seams/overlap in the tape wouldn't affect the print. Not sure how that would react to the heated bed, but if its double-sided and sticky then maybe it doesn't even need to be heated? The plastic would stick to the tape and there would be no way of the part lifting up. I was thinking maybe clear removable double sided tape. I was wondering, instead of using the expensive kapton tape that is meant to be used time and time again, does it make more sense to use something more cheap and remove and reapply each time?