QuoteArchiclem I know this is a flawed design (I mean cantilever... come on !) but I really like the compactness and minimalism of the overall machine... There's absolutely nothing wrong with a cantilevered design as long as, like anything else, it is designed properly.by LoboCNC - General
QuoteDaGameFace QuoteLoboCNC What are you planning on doing for wrist joints, if anything? In designing robot arms, you typically start with the wrist joints and then move back towards the base, as each joint will have to deal with the mass of the more distal joints. The wrist joints are also typically more challenging to design in order to keep the mass and size to a minimum. One more consideby LoboCNC - General
What are you planning on doing for wrist joints, if anything? In designing robot arms, you typically start with the wrist joints and then move back towards the base, as each joint will have to deal with the mass of the more distal joints. The wrist joints are also typically more challenging to design in order to keep the mass and size to a minimum. One more consideration is that the speed of mby LoboCNC - General
For non-Cartesian printers, the slicer would have to break up not just arcs into short segments, but even straight lines (like found in the infill) would have to be broken up into segments. For some models this would blow up the size of the G-code by more than an order of magnitude.by LoboCNC - General
There is some middle ground between building your own quality printer and a cheap $200 off-the-shelf printer. There are a number of reliable mid-priced printers that produce good quality prints. The main advantage I see in building your own, however, is that you become intimately familiar with every aspect of the printer, which is really valuable when something stops working (which will happenby LoboCNC - General
Quoteulysse31 A little question @LoboCNC about the acceleration parameter : Following the smoothie documentation, it says that 3000mm/s/s is a "standard" value for a 3D printer, you spoke ealier to reduce it to less than 250mm/s/s, so I'm a little bit lost on this and would like to have your point about which values should be good for acceleration, and also what is your personal experience on itby LoboCNC - General
Note that if you just lower your acceleration, you will only slow down at the parts with tight curvature (which is where your curling is occurring) without slowing down the rest of the path.by LoboCNC - General
You can also try really lowering the XY acceleration value (maybe <250mm/s/s?). This will slow the printing around the corners, allowing the filament to relax in place more rather than being pulled taught and curling up.by LoboCNC - General
Quoteleadinglights I think that there is one small niche market where it may be possible to make a 3D printer in limited quantities and make a small profit. This is the kit market intended for those interested in learning about 3D printers in depth by building their own printer. This has been tried before: There was for example a magazine series (over 52?? weeks) which would get you a basic printby LoboCNC - General
Quotenoobdude I'm a noob with no experience at all - and probably a head full of unrealistic dreams. I think this is the nub of the matter. There are lots of people here that make lots of precision 3D printed parts. I myself print a lot of complex multi-part mechanisms for engineering prototypes. But it takes lots of practice and patience to get there - a couple of weekends isn't going to cuby LoboCNC - General
QuoteSupraGuy QuoteLoboCNCI, for one, would favor a slower rate of change if it means more stable, well documented and easy to use products. Speaking as someone who didn't have any problems with the networking on the Duet... For a slower rate of change, there seems to be no shortage of available RAMPS 1.4 boards, and products like the MKS GEN boards which are compatible with them, and pretend toby LoboCNC - General
I'm a little reluctant to dive into this snit-fest, but despite cwaa's abrasiveness, he does have a good point - a lot of products (not just open source ones) have really poor documentation. There's the assumption that certain things (network configuration, how & where to make connections, what have you) any halfway competent person should be able to figure out, but that's only if you happeby LoboCNC - General
Stock Drive Products has Tru Motion belts that are some sort of while polymer compound with a fiberglass core (SDP/SI). The fiberglass is stiffer than the kevlar core found on a lot of polyurethane belts, but not as stiff and unwieldly as the steel core belts mentioned by the Dentist.by LoboCNC - General
Quoteo_lampe I made a short demo video about how the fishing line dual roller constrains the horizontal movement. The lines were tensioned by rubberband and as long as the tilting force is lower than the rubbers tension it stays horizontal. I almost felt like David Copperfield, when I lifted the extrusion with two fingers Looks like a drafting parallel bar. I used one of them for years.by LoboCNC - General
I've heard of a few old-timers on this forum talk about using a tall skirt as a heated chamber, I just can't remember who. This is a good case for printing upside-down, as the hot air will be trapped by the skirt rather than rising. I designed my UDIO printer to print upside-down (for other reasons), but I haven't had cause to try the tall-skirt heated chamber because I'm always printing PLA wiby LoboCNC - General
QuoteMelty QuoteLoboCNCAlso, there is a huge advantage to having all the printers be the same, both in terms of teaching the kids to use them and in dealing with maintenance. I agree with you, but I think there are also benefits to having the printers be different. For whatever reason, people tend to be inflexible at times once they learn and become comfortable with what a certain thing is or hby LoboCNC - General
Pretty cool mechanism, but there's probably something a little simpler. My UDIO printer bed (https://youtu.be/hdju_6XEHZ4) is not quite so elegantly minimally constrained, but it gets the job done with very few components.by LoboCNC - General
The high school I work with has six - 4 Prusa clone kits and 2 Makergear M2's for a class of about 20 kids who are learning Solidworks, as well as some use for other related classes. The clones get used regularly, but they are a little fussier and they get beat on. The M2's are rock solid, but are 5x the cost of the clones. The big point of contention is leaving long prints running, as the teaby LoboCNC - General
QuoteQuenta Hello, this is just a note so that you won't need to reinvent wheels. I've successfully machined out an all-metal, anti-ooze nozzle with a passive mechanical valve. Its working perfectly fine with the E3D ecosystem(namely chimera or kraken). It's currently in small lots production, available from here. documentation can be found here. I haven't decided on going for commercial producby LoboCNC - General
QuoteDjDemonD I've got some genuine gates 2gt power grip 6mm belts on my kossel Xl and it really makes no difference. Buy ebay belts with confidence, make sure they're tight but don't go crazy. Maybe not with complete confidence. I started off with some generic e-bay belting on a fairly large H-bot printer (350x350mm), but then bought some genuine Gates belting that was both measurable stifferby LoboCNC - General
If the extrusion process was controlled by adjusting the pressure, then I'd be more worried about pressure fluctuations. However, the extrusion processes is controlled by the rate at which filament is fed into the hot end. Because the molten filament is largely incompressable, what gets shoved in one end has to come out the other, and the pressure will automatically adjust to whatever it takesby LoboCNC - General
While New Matter wants (wanted) to control the whole software ecosystem for most users, it is actually possible to use any slicer with the MOD-t. Profiles have been posted for Cura, Slic3r, Simplify 3d, etc, and you can use a low-level utility function to send the raw g-code to the machine. Unfortunately, there's no decent machine control panel, and it's pretty clear that the ability to use 3rdby LoboCNC - General
QuoteMKSA And what pressure do you think it will have to act upon ? If there is no leak, a 1 bar in the "air chamber" at room T° will become how much at let say 200° ? If the temp (in Kelvin) is increased by 2/3rd (300K to 500k), then the pressure in the air chamber should also increase from 1 bar to 1.66 bar.. An alternative to this that I'm pondering is replacing the silicone o-ring and aiby LoboCNC - General
I helped develop the initial New Matter MOD-t prototype. I can't say I'm a big fan of the direction they took the printer, but it did come pretty close to being a completely hands-off printer for a reasonable price. It did fill a niche in schools and the like, where people wanted a very basic 3d printer without having to know any of the details of 3D printing. Unfortunately, it doesn't look lby LoboCNC - General
Quotenewbob What I find intriguing is the idea of offset chamber where filament is pressing on the wall as it's being fed which may speedup melting due to better heat transfer. I hadn't thought about that. My inverted printer (inverted printer thread) uses a right-angle feed into the hot end which does the same thing. It works pretty well - maybe faster melting is part of the reason. As for tby LoboCNC - General
Quoteaimdy this is the machine i was referring to. you can see here a basic cartoon of what happens in the heater block this shows the needle valves (pin) as well from outside the heater block in the dual material head they offer a single material head, with 2 nozzles for .3mm and .8mm and a dual material head with .4mm nozzles. The main issue is as I mentioned in my initial post. The machby LoboCNC - General
Quotenewbob There's (was?) printer made in Australia with valve in the nozzle. From what I recall it was causing all sorts of issues. Found it: https://www.wiltronics.com.au/Robox-3Dprinting/nozzle-valve-system/ From their description though, it looks like needle valve is not used during retractions: QuoteWhen they want to pause printing, or switch nozzles, the current nozzle is plugged complby LoboCNC - General
Quoteaimdy hello LoboCNC, i am not sure how far along you are but please check the following patents before investing a lot of money in this project. the design you mention is already in use in a fairly popular machine, the only difference is that the filament in yours feeds parallel to the valve pin. as you guessed the o-ring seal is the weakest point as it generally last only about 500hrs in thby LoboCNC - General
QuoteHugoW How do you set extrusion width? Is this something I should measure and teach Cura, or do you set it in Cura? I don't use Cura, but I believe it simply selects a line width equal to the nozzle diameter, so you could just set the nozzle diameter to 0.5mm. (Note that the nozzle diameter is not used in calculating how much material is extruded - it is really only used for establishing mby LoboCNC - General
If you've got 1mm walls printed as two unconnected 0.4mm perimeter lines, something this size is going to be hopelessly floppy. Firstly, you need to fix your slicer settings - either specify a 0.5mm line width so that the two perimeters merge into a solid thin wall, reduce the minimum infill parameters so you is tries to infill the small gap, or use a slicer like Simplify3D that can produce vaby LoboCNC - General