OH DEAR. "David" has decided to use 3D Printing to build a house. Sadly, it's not using the printer, more using the Kickstarter Funds. Any investors on here who are still without 3D Printing capabilities at home due to this, please PM me. -Andy Southern aka BathRoboticsby andysuth - General
Anyone care to look at this project and see if you reach same conclusion as I did. Look at the photo of the prototype. I've just challenged project t creator, anyone else notice something?by andysuth - Crowdfunding Projects Announcements
I always liked the Darwin paste extruder concept which used ideal gas equation to guarentee the nozzle pressure never deviated by more than 10%. IIRCC it involved a bladder which was approx 100ml in capacity, and then it was inserted into a soft drinks bottle which was approx 1L capacity and then the gas inside the bottle was charged to about 1bar gauge. As the gas was never expanded to more thby andysuth - General
It kind of does matter, we've spoken about pitfalls of patent system. Here's a hypothetical situation: Peachy is getting GREAT press coverage, but full public disclosure has not been made. Now what if there is a patent troll looking at this branch off who decides to look closer and realised a problem that would be coming out in beta testing. The patent troll could then file a patent applicatioby andysuth - Polar Machines, SCARA, Robot Arms
I see smoothie board reached their target in under 48hrs. Well done guys.by andysuth - General
Hi Rylan, What I was trying to articulate is how does your open source ethics fit with a business model where you sell the opportunity to be beta testers? Surely open source would allow anyone with the means and the inclination to make versions of what you've designed? The open source community could then upload their modified designs and hacks to tinternet effectively suggesting improvementby andysuth - Polar Machines, SCARA, Robot Arms
Rylan, I've just found your section in Kick starter for "Beta Testers": requires a pledge of $600 cad. How does this tie in with your fully open source policy? Surely that division between Peachy Printer Kit and Beta Tester pledge of $500 will only be of value if you aren't releasing the build data and software as OS until you send out the first wave of Peachy Kits (non beta tester kits)? Andby andysuth - Polar Machines, SCARA, Robot Arms
Traumflug, (SmoothieBoard) You should link direct to the project, give it a bit more easy publicity. I'd have gone for one of the early incentives if there were any left. I'll have to see what's in the other kits before committing more than the whole shiny dollar I've just pledged..... All the best, AS.by andysuth - General
this is great! I love the sds drill bit for the prime mover. I wonder if we could add a second high temp chamber and a ram of some description and make a simplistic injection mould machine? AS.by andysuth - Plastic Extruder Working Group
iquizzle Wrote: ------------------------------------------------------- > andysuth Wrote: > -------------------------------------------------- > ----- > > QuoteTraumflug my observation on > crowdfunding > > sites is, the higher the quality and the less > > risky a project is, the lower the backing > > is. > > > > Is that to do with the more establiby andysuth - General
I don't think TV licence vans still operate but about 15-20 years ago they miniaturized the equipment to hand held devices so they could walk around a block of flats. The detector vans couldn't localize the signal to a specific flat, the detector man could. Now if you buy a TV from any shop in uk you are required to fill out the new owner's details. When we consider the hassle UK gov has with tby andysuth - General
The way to structure that with closed source would have been to license the tech to the company that made it whilst retaining the IP yourself. I don't think that's viable with gpl or os. Though if you are putting it all out into the public domain immediately during development then you can't retrospectively apply for a patent on the tech (at least in non-corrupt patent systems). How about spliby andysuth - General
Traumflug, You're not one to mince words are you? ;p "Hoax" is a bit strong though, however the Kickstarter has clarified the Buckets and tripod legs are considered "Optional Extras" - a little misleading. QuoteTraumflug my observation on crowdfunding sites is, the higher the quality and the less risky a project is, the lower the backing is. Is that to do with the more established, lower riskby andysuth - General
I think there are questions about any consumer device that contains two mixing tanks. Closest analogue is a beer still: full circle to homebrew I guess! First thing I would do is print a calibration piece. As the level progresses up the scaling would need to change in x &y to cope with point of origin of beam. This will be minor for dz. But I am confident these problems can be solved. Maiby andysuth - General
I think I did know that about the RR and Makerbot, but thanks for correcting my error. The other point to consider is the 2nd breakpoint this has which is 5,000 units. At which point they will be using mass production techniques. I don't get your point about half baked ideas taking funding from developers developing Quality ideas. Cream will rise to the top, free economy, meritocracy etc. Let'sby andysuth - General
TraumFlag, $120CAD = £72. That's less than two nights out on the razz in UK. I've backed the KS. Imagine what would have happened if Makerbot or RepRap had been pitched at very early prototype stages? I'd still have put £72 towards one, warts and all. -ASby andysuth - General
Hi, Google Patent of Disputed 3dS vs. Make1 This is the patent, it appears to be part curing of the 3d part to cope with lack of support in areas. I'm not sure it applies here, on the Peachy Printer. The article mentions Kickstarter were dragged into the dispute on some level so I'd hope that KS would have passed this on to Rylan Greyston before commiting to run a KS project. I've joined theby andysuth - General
Viktor, I'd swap the German attitude towards engineering and technical subjects for the British one any day of the week. I think they have closed off the comments section, probably too many similar comments on the quality of the article. The point is, it seems completely random the journalist chose Makerbot instead of an international effort to make RepRaps. -ASby andysuth - General
Hardly a high quality publication, but why did the "Daily Mail" chose to write an article about the Makerbot rather than the RepRap Project? They could have put a little more local spin on the whole RepRap article. It does highlight the problem with British Journalism, lack of technical know how, the journalist openly admits to not being able to/bothered to assembly the Makerbot. Not havingby andysuth - General
I think I'll write this up some time soon, to capture the thought process going on here.by andysuth - Plastic Extruder Working Group
We all use calcs from different places, the skill is in knowing which calc to use when. The oldest thing in my office (250+ people) is my copy of "Machinery's Handbook" -1939. £10 off eBay. (Other online retailers are available!) I use it at least once a week. A lot of the calcs and units are in Imperial, but most of the principles have not changed since it was printed. More modern versions hby andysuth - Plastic Extruder Working Group
In all honesty, I think the square shaft is probably the leading idea. I like the encoder @ print idea, though the main problem with shaft torsion will be binding /angular misalignment with the sliding pinion. The problems with a square shaft are: 1. Control of tolerence/flatness/perpendicularity/etc around the shaft and along the length. (easier with round shafts). 2. Machining of the square hby andysuth - Plastic Extruder Working Group
St3 SolidEdge is hideously buggy. Seriously, when we switched from st2 to st3 I experienced negative work flow: the more I worked on a part, the worse it got, I've never seen anything like it, st3 is a complete joke. They've taken tasks that previously took 2mouse clicks and now require 4 mouse clicks and keyboard ops. Radius functions produce magic donuts. Text never aligns when producing flatby andysuth - Plastic Extruder Working Group
Cefiar, I'm not sure a RepRap would produce satisfactory results in its current incarnation for a Helical Gear, yet alone a Double Helical Gear. If you rely on the "Rim" concept you suggest, that would increase wear/shaft friction on the system. However, you have assumed that the bearings aren't directly connected to the pinion shaft, which they would be, though its not apparent from the curreby andysuth - Plastic Extruder Working Group
Goaran, There may be a few issues which may lead to jamming, most notable the angle of twist on the shaft, but they could probably be designed out. What factor do you think will lead to the gear jamming? I've not built a reprap yet, so I've not thought this thoroughly through, but do the print heads move or vibrate much when the extruder stepper isn't running? If the carriage is on the X-Axisby andysuth - Plastic Extruder Working Group
The main reason for the three rods is the need for minimal machining. The main constriant is the fitting inside the 8mm ID bearing. I was going to use some kind of "moveable shroud" - maybe even just another pinion that could be "pulled along" to hold the three bars together. This would constrian their position relative to each other, but could still permit torsion around the central axis. Anoby andysuth - Plastic Extruder Working Group
Dale, Assuming they are ISO9001 and externally audited, otherwise they could just "claim" to be C3 etc. I agree with you that it's unlikely a stepper will directly break the bearings, as it would be the X-Axis stepper in a position to damage this worst I think the drivebelt would go first. I'm not sure if the excessive vibrations going through them from steppers would be all that good for beaby andysuth - Plastic Extruder Working Group
ledvinap Wrote: ------------------------------------------------------- > andysuth Wrote: > > Yes they both sound great. I was going to > contain > > the shaft with two 608 bearings. Whilst they > are > > not supposed to take side loads, they should be > > able to cope with the small loads from friction > > (the whole concept here relies on friction > beiby andysuth - Plastic Extruder Working Group
ledvinap Wrote: ------------------------------------------------------- > andysuth Wrote: > > Yes they both sound great. I was going to > contain > > the shaft with two 608 bearings. Whilst they > are > > not supposed to take side loads, they should be > > able to cope with the small loads from friction > > (the whole concept here relies on friction > beiby andysuth - Plastic Extruder Working Group
....Also the gear ratio reduces the effect of torsion on the filament. Imagine a ratio of (say) 3:1. The pinion has to rotate three times to every once the gear wheel goes around. So if the Torsion on the shaft gives 3deg of inaccuracy, what is seen at the shaft is only 1deg inaccuracy, so reduces errors by a 3rd. This translates as directly into linear movement of the filament through the pincby andysuth - Plastic Extruder Working Group