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Printing issues ...
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Do a PID retune; the new bed probably has more thermal mass and therefore more overshoot on heating up.
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polyglot
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Reprappers
24V means you can run your steppers faster with less risk of dropped steps, which IMHO is the biggest advantage.
Assuming you're using switching converters to produce 12V and 5V rails, don't double-convert the 5V rail. Take the 5V converter's input directly from the 24V supply. If you're using a 24V supply, definitely do not downconvert that to 12V to run your heater, that's just a pointless i
by
polyglot
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Reprappers
I think Inventables will ship to Europe. They were cheaper than all but one supplier I could find in Australia, even after paying +50% of the extrusion price in shipping.
Ignoring that that's not corexy, your plate doesn't seem to have any free space for mounting it on the larger box frame.
by
polyglot
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CoreXY Machines
Is the nozzle crashing into the print? If so, you could try the Z-lift option in your slicer.
by
polyglot
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Reprappers
Looks like your Y belt is loose and you have backlash from that. The part where it's travelling in X only (before the red dot) is where the motor is taking up the belt slack without actually moving the print head, then it all moves at once with a jerk.
by
polyglot
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Printing
What's the measured change in sound level? And as per dentist above, what about the rubber isolators on the other side between screw and frame?
by
polyglot
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Mechanics
I suspect that you might get a lot more demand for this product in CNC milling circles where there is a lot more mechanical load on the moving head and in less-predictable ways. It would be particularly attractive if you can make a version that supports high power PMDC/BLDC motors properly. Closed-loop PMDC seems to be about the highest performance CNC motion stage that one can construct at the
by
polyglot
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General
Steppers are not a good solution to this. DC gearmotors with switches telling you when 90 degrees of motion have passed would be much more appropriate.
by
polyglot
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General
QuoteUkIanCould you link one please? I don't know what I'm looking for.
I bought item #151373405129. I also bought a 150C version to use as a safety trip on my heated bed, and I use the 60C version for thermal protection of my DIY audio amplifiers.
I expect some process variation between devices on switching temp but it may well mean that with careful selection, you should be able to get one t
by
polyglot
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Safety & Best Practices
You also have visible backlash in your cuts where the cutter force is dragging the head around.
by
polyglot
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General
I like the Pb-5Sn eutectic as thermal fuse idea
Until you get that tested, don't forget that there are bimetallic strips (with NC contacts rated for mains power, designed to be bang-bang thermostats) that can operate at higher temperatures than polymer thermal fuses. 250C seems readily available on eBay for <$5 and would work well to open a latched relay; I have a couple on the way and will
by
polyglot
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Safety & Best Practices
Any idea how that length ratio varies with belt speed? I was hoping to make some shorter belt twists (100mm) but on a very slowly moving Z belt, hoping that its lack of motion would imply a lack of damage from the twist. Also planning on having the twist between smooth/rear-surface pulleys and therefore with no nicking of the tooth corners as the belt enters/leaves a cog at an angle.
I also no
by
polyglot
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CoreXY Machines
Passive will be more reliable if its thermal design is sufficient, because there's one less moving part to fail and fans have short life spans, cheap ones doubly so. But a good passively cooled supply is likely to cost more (larger heatsinks required) than a fan forced one of the same rated power.
A cheap passive supply is likely to have under-specified heatsinks, but might work really well if
by
polyglot
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Safety & Best Practices
Try increasing the I value.
by
polyglot
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General
You have no triangulation in that frame, which means it will flop around (especially with plastic corners!) due to the inertia of the print head and you will get bad prints. Since you have printed corner brackets, it shouldn't be too hard for you to add threaded-rod diagonals to a few of the faces of that cuboid. Your bottom corner brackets are particularly problematic because they have signifi
by
polyglot
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Let's design something! (I've got an idea ...)
Not much point having an open-source machine if it depends on closed-source tools to build it. RepRaps wouldn't be self-replicating if you needed to buy a SolidWorks/whatever license for each one to be legal, not to mention the ongoing functioning of commercial tools being necessary for the system to operate.
The point of open source is that you control what you run, and you know you can always
by
polyglot
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OpenSCAD
40-pin IDC ribbon cables, aka IDE cables, are really good for this sort of thing and they're commonly used in the DIY audio field. All the plugs/sockets are cheap, the cables are often free, they fit on 0.1" perf board and you get about 20 connections trivially, with the ability to gang a few conductors together for the high current loads.
With a bit of strain relief, the wires are as durable a
by
polyglot
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Reprappers
You can also double, triple or quadruple the belts on a Z stage with pulleys to effectively gear down the Z motor and use a basic NEMA17. I'm doing a build at the moment with tripled belts on the Z bed lift (and CoreXY for the hotend), i.e. it takes 3 rotations of the 20T GT2 pulley to move the bed by 40mm (motor pulley circumference).
With 0.65Nm stepper, that's about 30kg of lifting force; I
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polyglot
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Extruded Aluminum Frames
I think this thread should be a collection of common print faults in the wiki, perhaps this one here could be extended with new photos as problems crop up?
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polyglot
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Printing
The multi-pulse solution present in Marlin is perfectly good if the stepper driver supports high microstep rates. And given that the A49xx both do, I guess there's probably not a lot of call for it from reprappers.
I'm more used to older, larger drivers like the Toshiba that are limited to 30kHz and for which the multi-pulse technique likely won't work.
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polyglot
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Developers
More to the point, the belt paths between a fixed point and a carriage must be exactly parallel to the carriage motion. So yes, this means that the red and blue belts as indicated will be perpendicular, but it's more important that the belts are parallel to the direction of motion that they're actuating.
If parallelism is not achieved then belt tension will change as the carriage moves; it shou
by
polyglot
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CoreXY Machines
If you now reverse the electrical connections on one motor, the axes will swap.
by
polyglot
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CoreXY Machines
Simplest step forward is a single-axis roll stage under the heated bed. One stepper, a couple of bearings, some framework and a printed 600-tooth GT2 gear Probably under $50 in mech parts assuming there's a spare stepper driver on your controller board (e.g. RUMBA has 6, which means 2 spares on a single-extruder machine). Then the hard work and experimentation begins, e.g. trying to print a
by
polyglot
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Developers
I hadn't seen the Sextupteron. It looks like it would be good for milling (where gravity is irrelevant), but what I'm suggesting is to rotate the printed item in X and/or Y while it's being printed. The sextupteron doesn't help you much with printing protrusions out into space because it rotates the tool not the workpiece.
Imagine putting the heated build plate on a gimbal; it's mechanically a
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polyglot
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Developers
I'm piling in way late here, but I like the idea of shrinkwrapped coils on a single cardboard core (about 100mm diameter, no inner bore structure), which can be inserted into a pair of reusable spool-ends. It means minimising the packaging waste (just like shipping bare coils) but by placing the coil into a reusable/splittable spool, you retain all the usability of spools. If you're willing to
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polyglot
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Printing
Consider 4- and 5-axis mills that support rotation of the workpiece around X and/or Y. If we did something like that for an FDM printer, it means you could have filament paths that are fully supported but not planar, i.e. you can construct an object out of arbitrary paths. This would have a number of advantages:
- some dramatic overhangs are no longer overhangs at all; you can build arms out r
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polyglot
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Developers
If it's mechanically hard to move your Y end stop, you could flip the X endstop instead if that's easier. That way it will be mirrored in both X and Y, which is equivalent to a 180 degree rotation. Parts will come out right; they'll just be sitting in the printer in a different orientation.
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polyglot
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Reprappers
You're way over-complicating it, guys. No need to change gears during a move (let alone during acceleration!) or for very short moves because it's only useful when you want a big fast traversal and don't need as much accuracy during that traversal.
No change to the ISR is required, just to the step planner. The machine dynamics aren't really any different so the lookahead code would probably b
by
polyglot
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Developers
Well, I don't have a printer on which to print anything yet. I'm rep-strapping.
Will wrapping the belt around a bolt so that it engages itself and then clamping (zip tie?) be reasonable? I don't want to violate any min bend radius constraints and have the belt snap at the bolt.
by
polyglot
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Reprappers
I realise that most people are using printed clips to retain the ends of belts, but what if you're not? Where do I get a corrugated metal clamp to hold the end of a GT2 belt? The obvious search terms on eBay are buried in fashion accessories.
by
polyglot
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Reprappers
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