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FalmouthLouis

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  1. To what extent can one rejuvenate old or moist PVA? I've got four or five partial reels of PVA floating round my workshop, some of which will be 18 months old. Does anyone know how PVA ages if it's kept in reasonably dry conditions? Secondly, if PVA is just kept in a cupboard with no dessicants, how much does it deteriorate? I have a fruit dessicator, so I can heat the reels up without any problem. I saw somewhere that you should not heat PVA above 40 degrees. Does anyone have views on that? To what extent can one use heating/drying to rejuvenate elderly PVA
  2. I'll come back to this debate later on today, as I am having to tackle a severe PVA problem. I'm trying to print a copy of someone's sculpture, which needs PVA support because Breakaway would produce too much strain on the structure when I tried to remove it. Initially, PVA flowed for about an hour but then seized up in the nozzle. I've three times done hot/cold pulls and got the PVA apparently flowing, but, as soon as I try starting the print, nothing flows again. This is despite the fact that I'm using all the tricks I know to dry the PVA. It could be that the problem is the extr
  3. I'm having steady problems with PVA failing part way through jobs. It's clearly to do with dampness, even though I am using a fruit dessicator to dry reels in advance of the job. I found the following exchange to be pretty useful. I've got a spare Polybox so I'll bring that into action. Will report back.
  4. Point taken. I've been using it for a year or so without obvious issues, but I see the danger. Thanks.
  5. Ummm, no. But I see the point you're making. What would you expect to happen/fail?
  6. I was talking about the special Magigoo for Nylon. I hadn't realised that they did a common-and-garden version as well. I like 3DLac in that I find, personally, find it easier to apply than a stick. Mind you, I tend to stay away from the printer until the fumes have dispersed.
  7. Just recently, I've been using Magigoo to support materials like Nylon. I'm still using 3Dlac for PLA jobs. Where's the crossover point. What works best for filaments like CPE, nGen etc?
  8. I've just been reminded about why I don't like PVA. I've got a commission to print ten of these handles you can see below. They need to be in nylon and whichever way they're printed, some support is needed. I've had bad experiences with Nylon and Breakaway, so decided to print these with PVA supports. My first print of three went fine. My second print of three had problems with nylon warping, probably because I hadn't done enough magigooing. After aborting, I started another print and the PVA refused to flow. It turned out that some had got stuck in the drive mechanism, so I had to disassemble
  9. Thanks P3D: A lot of the time, I'll be printing to support sloping or curved surfaces, so pausing to change some layers to Breakaway doesn't make much sense. In general, Breakaway prints pretty well, and I've just printed a marionette head which needed both external scaffolding and very light infill so that it supported the roof of the head and could be carved away. Breakaway worked fine for both.
  10. OK I think I've found the problem Problem is with the positioning of the eye sockets which are relatively widely spaced. Scaffolding clearly doesn’t like starting on a shell at the base of the structure. I found that I could get scaffolding to start when I sank the head down to give clear printbed below the eye sockets. At that point, the scaffolding emerges quite happily. However, I wouldn’t choose to split the head at this particular position. The photo below shows that I almost have to split the head in half. The alternative is a very fine infil
  11. I'm printing a hollow puppet head for a client. Whatever orientation I choose, there is always a 'ceiling' which needs support. The orientation illustrated below makes most sense as it allows me to provide a hole at the bottom through which the client can insert eye units etc. The trouble is that the eye socket units are designed without any initial contact with the shell. I've instructed infill to be generated everywhere, but it just chooses to support the ears on the outside, and whatever I do doesn't seem to produce scaffolding for the eye sockets. I see I could programme a very faint infil
  12. I've posted a couple of queries about the workings of PVA and Breakaway. In the course of this, I've been encouraged to explore the mind-boggling array of options in Cura for tweaking support structures. This would suggest that, within the Ultimaker/Cura community, there are people who have given a lot of thought to how support structures can be optimised. However, a moderately experienced operative like myself is just bemused as I look at the checklist of options. I now have a decent amount of experience with printing supports in either PLA or Breakaway. Some initial thoughts
  13. Geert - given the complexity of support issues (and wider dual nozzle coordination) it would be good if you could get a dual nozzle machine off Ultimaker so that you could put your massive expertise into helping us from direct experience with these systems. I understand what you are saying above, but I am generzlly taking other people's designs and creating bespoke support structures for each project would drive me insane and would be financially unsupportable. I've been poking around Cura's preferences for the support function, and there are a mind-boggling array of op
  14. Oliveros: there are a confusing number of options in Cura's preferences for controlling supports. I've picked a few which may help a bit and will do some experimentation. My guess is that "support z distance" and 'support top distance' could be key.
  15. Oliveros: thanks for this. I'm normally taking other people's designs so what do I do within Cura to make sure the relevant gaps are big enough?
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