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  1. I am enjoying my ultimaker 2+ so far but I am having problems reaching the best print quality at a decent speed. In order to make ghosting invisible I have had to reduce acceleration to 750mm/s^2 and jerk to 3. This is relatively slow for printing large objects so I am looking for some community feedback here. What acceleration and jerk settings are people able to print https://www.thingiverse.com/thing:277394 with no visible ghosting? I suspect the spring tensioner may be contributing to these low values so I am also looking for any tips/tricks to possibly improve belt tension? All the best, Adam
  2. I am a PhD student working at the University of Liverpool studying physics. My whole project is focused around designing, constructing and operating a novel detector for liquid argon neutrino physics. You can see a render of our experiment design below. Please see our website if you want more details http://hep.ph.liv.ac.uk/ariadne/index.html The difficulty with liquid argon experiments is that ultra high purity is required for the internal components as well as the ability to operate at cryogenic temperatures. These conditions are very demanding and list of materials we can use is similar to those certified for space flight. 3D printing is a big hobby of mine and I have been trying for a long time to integrate 3D printed parts into our experiment to save on the large costs associated with machining custom parts. In the past we have used some ABS printed parts but we always were concerned about outgassing, potentially harming our purity. ABS also has a relatively high CTE which limits potential applications. It has recently been demonstrated that it is possible to print PEEK using a modified ultimaker 2 (see https://ultimaker.com/en/community/21376-guide-printing-peek-polyether-ether-ketone-on-the-um2). PEEK is a very clean material and filaments are available with measured low outgassing properties, vital for maintaining a clean experiment. I propose that with the ultimaker mark 2 I will be able to design and build a custom toolhead dedicated to printing PEEK. Having a custom tool head gives me the flexiblity to design dedicated cooling systems and integrate the specialist hotends required for printing at the high temperatures PEEK requires. With the mark 2 upgrade I will still retain a separate toolhead that can be used for investigating soluble support material compatible with PEEK in the future. This setup would allow me to print objects in PEEK that cannot be made in our University workshop. This has the chance to create some really cool hardware and may even help us achieve our physics goals when our experiment is deployed to CERN next year.
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