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mmartin

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  1. For Alibre users: 3D systems will discontinue the smaller versions (Elements, Pro) 20 April 2015, only the top version survives. Might be a final chance to get a elements version (if this is still available somewhere). If you live in Switzerland, http://www.alibre.ch/news/pro2expv17.php is an upgrade offer. For non-pros: Consider Cubify Design.
  2. The tilting print head idea has been around for a while, also in a Stratasys patent (see earlier post). As UM class machines suffer from the lack of high precision machining (in order to keep cost low), it makes sense to use elements with high precision/cost ratio. A ball bearing probably is the best performing construction element here, much better than self-made linear bearings. However, your sketch shows how to maximize nozzle inaccuracy for a given bearing play - the nozzles are too far away from the bearing contact points. Move the nozzle ends as close to the X bearings as possible to min
  3. Geomagic design (got the medium license when it still was Alibre design). There is a stripped down version of Alibre which is called "Cubify Invent". It sells for $39 and has a free trial version. If you are looking for a mechanical CAD in the style of Pro/E or solidworks, I'd try this. Not very good for organic shapes though. EDIT: Just saw this has been recommended already. Cubify Invent does not support assemblies, which makes it more or less worthless for mechanical design. Cubify Design (€149) does.
  4. AFAIK the safest way to establish prior art is send the application in to the patent office, then later not pay the fees (let it expire), as you explained in a prior post. You don't gain protection, but nobody can patent your idea either at the novelty is not given any more. You could have done this with your ideas, even if you think patents and UMs open source strategy don't mix. Otherwise you live on the remains all other players leave in the field. Wikipedia article on prior art - little chances for internet sources.
  5. Tools: I found the patent list a bit depressing. There's tons of great ideas, but none will make it into an UM! So here some ideas on what can be done, specifically what tools are worth using in development. I hope this does not go too far OT. With any motion system, the question is how closely the "tool" follows the path you commanded. For an UM style layout, it's the position of the nozzle via the topmost layer of the print on the build platform. All mechanical systems show play and vibration. If after a move, the build platform wiggles too much, it might collide with a (2nd?) nozzle and ri
  6. Patents: I'd like to encourage you to look out for interesting patents. I'll give a short introduction - I'm no expert myself (in the industry, you always need a patent attorney, it's sufficient if he knows the fine print), feel free to add your own suggestions. Reading patents can be fun. They are a treasure trove full with ideas that were deemed working and bring some benefit. Although some might seem cryptic at first, this is not intentionally so. In fact every patent must be a blueprint from which the average but non-inventive ("skilled in the art" is the legal term) Joe Engineer can bui
  7. Build platform: The manual says replace it regularly, but in practise, it lasts a long time (not only printing twice). The solvent for the soluble support is water based, not water. But not limonene either (which I find nasty). Anyway I think if it is saturated with plastic, it needs to be disposed of properly (not by pouring into the drain), so even if the solvent would be pure water, I wonder if you could pour the saturated solution simply into the drain. Actually, it is much more difficult to build a €2k printer instead of a €50k printer. Only lightweight parts, low precision components,
  8. Fair or not fair is irrelevant IMO. The relevant question is: What can be learnt from these machines? There are many design considerations that are worth questioning, on both sides.
  9. I decided to buy an UM2 once a working (soluble) support material solution was there. It seems this is not going to happen! I regularly see a Dimension Elite printing. It is amazing to see how effortless and without any problem this thing works. It "just prints". No delamination, stringing, dripping, oozing, warping, clogging, ringing. As many are wondering how a soluble support material solution could be designed (which I think makes it a tool instead of a toy), it is worth looking at how for example this specimen does it - an almost a decade old design! Maybe others can share their obervat
  10. Same here - my status is still "validating" after a couple of weeks. When I press the "resend validation" link, I get an email, if I follow the link in there, I get: Oops! Something went wrong! [#10121] You have completed your portion of the validation request already. An administrator must approve your account before you have full access. So how can I get admin approval for my account? Thanks!
  11. Hmm, I could start this topic, but not in the "dual extrusion kit" area. In my profile, it says: "Group: validating". I checked my spam folders, but did not find any email in there - but it might have been deleted because I registered a while ago, but never got a confirmation that it would have been approved by a moderator (which the registration process said would be necessary). I don't see a 'validata' button in the profile either... Anyway, would there be a specific reason why I could not post to the dual extrusion forum?
  12. ... or "you cannot reply to this topic" is something I've seen a couple of times here. Could someone please enlighten me about the posting policy for new users?
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