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3ddave

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  1. hi ultiarjam, I did also wonder about the properties of the material, the pla that came with the machine was new and I never had this problem, but the problem always occurred with 4 different rolls of differing colours of abs that I bought at the same time from someone selling it cheaply and I wasn't sure if it was cheap because it was old or deteriorated due to its age and was no longer fit for purpose. I will be experimenting now in light of the answers I have received. I do not have any data for the rolls that I have and I do not know yet how to accurately measure softening rates but wi
  2. hi gr5, thank you for your very comprehensive and informative reply it has given me a much better understanding of the principles involved. I did notice that the problem occurred more on the cooling fan side of the print and also on the side of a very cold draught as I am operating in a cold draughty and unheated garage and as you say the problem occurred more on angular surfaces with thin sidewalls. I think that you have also hit on the bonding between layers as being a possible cause. I also had another issue and posted a question (oversize prints) in one of the other topics, this was due
  3. hi Robert, success! when I 1st put the new settings in the machine they kept getting overwritten by cura when I sent the print to the machine, but following your lead and a lot of experimentation I managed to add some programing to the start of the g code and now my prints are true to scale and I have gained a lot more experience thanks again dave
  4. hi Robert, sample part size that I drew on sketchup. not sure of the printer manufacturer its a marlin, rep rap, ultimaker clone, I use cura 15.04 and get the same results with both abs and pla set to their recommended temps. the model size should be 24 x 39 x 7.5 but comes out at 28 x 44 x 7.5. I think it has ramps hardware, I bought the printer 2nd hand and have no information with it.
  5. hi Robert, sample part size that I drew on sketchup. not sure of the printer manufacturer its a marlin, rep rap, ultimaker clone, I use cura 15.04 and get the same results with both abs and pla set to their recommended temps.
  6. hi, when I do prints using abs they have a tendency to de-laminate and split in a curving fashion, they are also very easy to break apart between layers. is there anything I can do to reduce this? thanks dave
  7. hi, when I make a print the overall size is approximately 10% larger on the x and y dimentions to those shown when I scale the print, the z size is just about right. is there any way that I can rectify this to give a more accurate print. thanks dave
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