The clones are well known for jamming. The reasons vary from poor machining and surface finish to poorly replicated parts leaving gaps where there shouldn't be gaps. Most of the jams seems to occur in the heatbreak though, the filament sticks to the sides and clogs things up.by Trakyan - General
QuoteMKSA And what about the dust that will be squeezed between these belts ? When rack and pinion are used, better have the rack up and the pinion under. Note the belt tooth profile is not fit to work as a true rack and pinion. Anyway, there is more, just read the comment by Kevin Delaney. You don't need to tension the top belt so it permanently locks against the bottom belt, you can leave theby Trakyan - Reprappers
QuoteMechaBits wouldnt be beltless then, what's the benefits over just standard omega without the extra belt, I imagine the one with the extra belt is better for moving the profile(if it was glued to profile). The advantage is as stated, much lower belt stretch since only a small length of belt (between the two idlers) can stretch. Past that point the belt locks teeth with the one glued to theby Trakyan - Reprappers
Fair point then, I haven't used the commercial offerings but from what I've seen and done Aluminium is harder to heat. Also why induction stovetops don't work so well or at all with plain Aluminium pans or pots. I'm sure you can use a more powerful induction heater, but that all adds cost, complexity and makes it a bit more dangerous. I still reckon a regular heater is the best bet. Works equallyby Trakyan - General
One drive system you could consider is the so called "servobelt". It uses a fixed, glued to a flat surface length of belt, and then another belt on top of that running in the omega drive configuration, with the teeth of the two belts interlocking. This limits belt stretch to the short length between the two idlers on either side of the drive pulley, since past that the drive belt is meshed with tby Trakyan - Reprappers
Induction heaters can't be used to burn out molds etc. They can only heat conductive materials, and even then they tend to only be very effective with steels and iron, stuff like aluminium (which is what most hobbyists seem interested in due to a lower melt Temp) doesn't interact with the induction heater coil as much and therefore doesn't heat up as much.by Trakyan - General
Belts and tyres are made from the same/similar materials and puncture repair kits use what is effectively CA glue, so no problem with gluing them. Unless, as o_lampe mentioned, you expect the glued section to bend around a pulley or something (spoiler: it wont).by Trakyan - General
Wouldn't want to be the poor sucker stuck maintaining those pumps.by Trakyan - General New Machines Topics
Not the answer you're looking for, but try a different software. TinkerCAD may be easy to start with, but you'll quickly reach a point where it becomes really difficult to make what you want because tinkerCAD isn't made for complex or precise items.by Trakyan - 3D Design tools
1mm+ thick cables are nothing new, I have some that I plan to use. That and you wont necessarily need that thick of a cable if it stretches less. If creep is an issue use a fiber/cable material that creeps less, Aramid or steel and the likes. If you're complaining about creep in aramid or steel you should be complaining about creep in belts too. Anyways, back to finding a solution to a cable drby Trakyan - Mechanics
Bearings don't make much sense here. They add more parts with little to no benefit (plus you'll likely hear them spinning and rattling). Try a concave plastic dish from perspex or the like and some thick woolen socks, all the low friction you'll need.by Trakyan - Let's design something! (I've got an idea ...)
I've read that hemp/cotton bags take a very large amount of energy to produce, so their carbon footprint is actually fairly large and you'd need to use it well into your children's lifetime past yours to equal the footprint of a plastic bag. It sounds a bit sketchy and maybe short sighted to me, but just thought I'd mention it.by Trakyan - green talk
Solid state thermal generators sound fun, I'd love to have a go at a DIY version though that's probably in the distant future for me. Any idea how their efficiency compares to something like a dyno or other generator? Also, while they may be useful on a large scale as a power plant on their own, I'm thinking about how many things we use produce "waste" heat. I'm guessing these thermoelectric genby Trakyan - green talk
In obelisk's defense, a large chunk of your posts are something from a "subtle" *wink wink nudge nudge* "the duet can solve this problem for you", to less subtle plugs. I get why, but still In terms of concrete extrusion, I suppose a look at those machines that pour foundations would be a good start. Not concrete mixer trucks, but the ones with a long chute that can be pointed and directed whereby Trakyan - General New Machines Topics
I wouldn't say it's worse than moving the bed. That's a moving portal style CNC machine, nothing out of the ordinary and fairly common. I'm not too sure how the kinematics work though. For the record, that ramXY is basically the same things as the drawbot but with extra frame pieces. And iirc the kinematics are the same as coreXY/hbot despite TDD's assertions otherwise, it's a stripped down versby Trakyan - Mechanics
Belt stretch can be a problem, especially under dynamic load. It gives us ringing. For a given cross section, PE fishing line has a less stretch than kevlar or glass fibres. It has a higher young's modulus than those two. It also outperforms steel cables but I can't remember if it was by weight or cross sectional area. Regardless of how it outperforms steel in terms of strength it has a much loby Trakyan - Mechanics
piping concrete is fairly difficult in general from what I know. It's usually "poured" rather than pumped since all of the grit and aggregate would wreak havock on any sort of pump. Possibly mixing it at the head could work? You can get the concrete mix to the head via vacuum, similar to how pellets are fed to the seemecnc part daddy, and then water can be pumped to the head and the two componentby Trakyan - General New Machines Topics
QuoteMKSA 5mm flex for 1kg, I don't call that rigid. Don't used a 1kg print head? The flex should be fairly repeatable so it could be calibrated out with bed leveling (look at scara arms). Of course it isnt as constant in the z axis like with scara but for reasonable z axis ranges it should be "constant enough". At this scale you're likely working with big nozzles, layer heights and extrusion wiby Trakyan - General
Quoteo_lampeIt is the biggest hole on earth already and they want to increase it although they don't need that coal in the near future. But... more bigger more better? I kid, I kid. That's what they call "potential for growth". Coal can be sold even if you don't need it yourself, so digging a bigger hole is just digging more money as far as they are concerned. Until coal stops being a very usefby Trakyan - green talk
Says it's a pre-order and not yet in production. Also I'm kind of surprised. I've looked for clone rambo and einsy boards with little to no luck, but something as niche as this exists?by Trakyan - General
From my understanding it doesn't work on making a hole, more off which frequencies the atmosphere reflects or absorbs. Not saying it's a holy grail solution, I can imagine it'll have its own set of reprocussions, but just thought it might be of interest. I like vdx's idea of recycling on the molecular level. That would mean a) there is no longer a recycling "cap" for things like plastics where tby Trakyan - green talk
Take the design of the above kiln and replace the propane (did not watch the video fully) heat source with nichrome wire. That's about as "clean" as melting metals gets. This guy used a welder and some fire bricks for the kiln body, but there is nothing stopping you from using the bucket and concrete idea from the other video and the nichrome wire from this video. Nichrome wire is also probablyby Trakyan - General
I wouldn't say moving the XY gantry in the Z axis defeats the purpose of coreXY. CoreXY having stationary motors means the print head and moving parts of the gantry are kept light. I don't see how lifting the XY gantry in the Z axis defeats this purpose. That being said, I'd say go for the moving bed. The XY gantry is much more difficult to get square and level than a single plate (your print beby Trakyan - General
QuoteVDX ... "productivity" or "efficiency" are mostly technically and profit-oriented concepts, when size and costs count. In the "wealth without money" view, what Adrian meant for the RepRap project, other problems and solutions can be totally different. So why look at (and pay for) the "most productive" high-tech fabbed wind or solar generator, if low-tech variants in bigger counts can generby Trakyan - green talk
Have a look at the Sl3dr by richrap, ultimaker/quadrap or the XY stage of an etch a sketch. All interesting mechanisms that (i think?) fit your goals. I've looked at them extensively for similar reasons as you.by Trakyan - General New Machines Topics
As far as inexpensive goes, your best bet would be a hangprinter style setup with cables. Anything with a solid gantry will get very heavy and expensive very quickly as you scale it up. Cables stay relatively cheap. Pumping/mixing concrete for the extruder is a bit of a niche issue so you're unlikely to find a cheap or easy solution to that problem without significant work on your part (thus mayby Trakyan - General New Machines Topics
Correct me if I'm wrong but aren't you describing klipper? Yes I know it technically calculates the inverse kinematics on the fly at run time-ish with a bit of a buffer, but as far as the micro controller running the machine is concerned, the inverse kinematics have been done prior to run time. I don't know if the raspi classifies as a "host computer" like you mentioned in the OP. I personally dby Trakyan - General
You could always make a bigger gantry to reach over the edges of your bed on any motion system. There is nothing out of the ordinary in that machine if you ask me. If you're asking can the X axis extend past the Y axis rails, then yes, just add a few idlers to make the belt turn at the XY junction and make it track parallel to the X rails as it heads to the end of the X rail, where it resumes thby Trakyan - Mechanics
have you considered using non printed nuts? the tolerances would be better and it would probably decrease noise and friction. I like the collet style anti backlash nuts like this one. Otherwise cool build, I've been thinking about doing something like this for a while but the cost of extrusions has been putting me off, especially for "experimenting". As for sticking of the slides, maybe they aby Trakyan - Reprappers
Your endstops are probably configured incorrectlyand the printer thinks it's stuck in the home position.by Trakyan - General