It is a nice exercise but again, what are the advantages compared to two simple gears and do they offset the extra complexity, weight, cost, size,friction, backlash .... ?by MKSA - General
Quotethe_digital_dentist Pillow blocks to hold linear bearings do have a couple advantages over zip ties. They allow some adjustability of the position/alignment of the bearing, and with some bearings, allow adjustment of preload. Over time, nylon zip ties absorb moisture from the air, are affected by heat and exposure to UV light, and become brittle and eventually break. Sure, they're cheap aby MKSA - General
Quoteo_lampe The NEMA14 pancake is almost too strong. With the original idler clamp, I had a few issues with grinding. OTOH, the retraction speed was lower than I'm used to. If I had the chance, I'd rebuilt it with a lower gear ratio. I actually don't remember what the ratio is, have to read the original thread again. 1:12 or 1:16 IIRC? I just did a few dry tests: reduced yerk from 2400 to 1200mby MKSA - Delta Machines
He just woke up from a 6 years old coma, like this threadby MKSA - General
You answer assuming the OP is right in blaming the stepper drivers ! Even more, the circuits you propose are probably the same as the ones used in his board. Oh yeah, we know there are four pins involved. Funny isn't ? How about reading about stepper and their drivers, DC42 made a good summary around here.by MKSA - General
QuoteMoriquendi Seems to have improved drastically this afternoon Idris Indeed, I just shot "cwaa" who was frantically opening new browser pages ! (see above)by MKSA - General
Redemptioner: I know the purpose of these springs, see here: Just that by having the Z sensor part of the printhead, we don't need them anymore. Head can be made to take the beating or protection mechanism can be implemented (spring ?). A sturdy bed is heavy so the spring must be strong. So ? Built height gain ? How ? Your compare to a way of mounting the Z sensor on the head. Compare to leby MKSA - General
Quoteleadinglights QuoteMKSA Looks like this extra complexity is likely to prevent the building of a proper sturdy bed. ............ For a printer which already has the bed mounted on three mounts with return springs (e.g., most good Cartesian pirnters), the parallel mechanism introduces no significant compliance. Putting it another way, it is just as sturdy with the under-bed sensors - that isby MKSA - General
[email protected] point taken. Then I'll better be the first. My project is to build a vertical windmill, with wings 3 meters high, each build in 3 modules. So my new printer must ether have a 1 meter hotbed or a building height of 1,1 meter. Jes I like your sense of humorby MKSA - Mechanics
Looks like this extra complexity is likely to prevent the building of a proper sturdy bed. One Z sensor part of the print head is for me the best way to go. It is what I have been using for a few month and don't even use auto bed leveling as it is a cartesian (a simple Prusa) machine. Will keep the same approach as it even makes more sense with a better built.by MKSA - General
The answer is that it is not worthwhile here compared to simpler method. Don't assume you are the only one who thought about it. IBM did it as you know but the idea is used in many other mechanism. It is just physics. Now, it would be nice if you could make it and show it working for a 3D printer. That would be a first, indeed.by MKSA - Mechanics
Quotethe_digital_dentist I've studied physics. One thing that I always liked was dimensional analysis, and one thing I always hated was naming units after people, thus obscuring the underlying, fundamental units. Dealing with Newtons and Pascals always felt like using feet and inches. If you want to honor physicists who made great discoveries, build a statue in a park somewhere, or name a univby MKSA - General
Quotelucaestiva Thx VDX. Yes sometimes i made, very stupid little errors not only during conversion... Milli, Micro, Nano, Pico and so on... ... These are NOT CONVERSION ! You CONVERT inch to yard, feet etc... because they are different UNITS ! In metric, you have ONE unit and uses base 10 prefixes to make it easier. For computation, use scientific or engineering notation. . Difficult to mby MKSA - General
Did you carry the paper shim test with the bed and hot end powered and at the T° used for the print ? Your bed may be "level" enough at room T° but deform when heated. Could even deform during operation if everything is not tight, too much play ....by MKSA - Prusa i3 and variants
Here is the kind of "improvements" people do to just the frame : Poor guy was bending the frame just by playing the controls And all the other issues, for ex: So people reading this thread get fully informed, in fact warned.by MKSA - Prusa i3 and variants
At the end, I move the print head to the home position; Z 0 too, in order to have the still hot nozzle rest on a piece of PTFE that will prevent formation of a filament blob that would disturb the Z homing sensor. It is the nozzle touching the bed that determine the Z0. No adjustment necessary. Of course, not applicable if the part is such that collision will occur when Z homingby MKSA - Prusa i3 and variants
I can't believe such praise for a machine so flimsy that just adjusting the belts bend the frame ! And this is just one issue. It doesn't just bend, it often cracks ! ( Note that luckily it bends otherwise it would freeze due to poor guides and alignment. Just a cheap clone of the Prusa that brings nothing, no innovation, no improvement, just the opposite in fact. Oh yeah, plenty of people lby MKSA - Prusa i3 and variants
To clarify the wrong use of regular steel screws and hex nuts in an assembly, here is just one typical example found in the 3D printer world: Here self tapping screws or even a regular Mx can be used. To 3D print the thread is useless and time consuming, taps are cheap and in fact not even necessary to tap. Eventually, a bit of filing of the screw will make it self taping. Enclosed nuts are sby MKSA - General
To be used only when you need to screw/unscrew often. Most of the time self taping screws are better, if possible designed for plastic. Od PC, printers etc.. are a good source for all these AND threaded inserts too. Avoid this non sense of making square holes to accommodate hex nuts. It makes the parts complicated and fragile, will drive you crazy when trying to put the nut and screw unless yoby MKSA - General
Quotelukie80 Hmm. It could reduce ripple a bit. Accelerating or decelerating causes force being applied on the guiding rods which in turn bend and relax. An acceleration of 1000mm/s^2 and a 0.5kg carriage causes 0.5N of Force which results in a deflection of 60µm at the center of two 8mm 40cm steel rods, according to online calculators. The deflection computed is for a static force, here it is aby MKSA - Mechanics
Quotetech-raton The MG08 was made to over-kill... For the tubes, the number of tubes depend of the pump's flowrate. We could simply use a tube like that: the heatbreak (vertical) goes trough the tube. (horizontal) With a sufficient flowrate, this solution is possible. Again, why make it complex and wrong (yes, it will work because there is not that much heat to extract anyway) when it caby MKSA - General
Just that the dial holder you use is bad. Unless you are lucky, there is no way the holes in it match exactly the rod diam and rod center to center distance. Therefore they will bend when you place the dial and the distance you measure will not be correct. The ABL should correct it and may be it doesn't work too ? You may also have excessive play somewhere (The "grinding" bearings may have grby MKSA - Prusa i3 and variants
Quotetech-raton I agree with the "shortest path logic" But the hotter liquid will be on the upper side of the heatsink, no? and the heat will be transmitted to the whole liquid? I was looking at a way to make it "maze like" with cold solder to block the path and dremel to drill some holes. But because the watercooling is overkill, i can live with an unoptimized part. The second thing is the lby MKSA - General
Quoteo_lampe The shape of the heatsink fins isn't optimal for good water flow. The main stream will just take the shortest path. I'd cut out a small gap in every other fin, so the water has to flow through a zig-zag maze. Watercooling a single extruder isn't worth it except you'd build it extra small. But on multi nozzle extruders it helps a lot to prevent oozing. Water chills down the unused toby MKSA - General
Water cooling ? What is the advantage ? Even in a heated chamber, is it required ? In a production machine eventually but then, none of the amateur machines fit the bill. An extruder, hot end has to be small, light. Easy to remove, install without loosing adjustment. (One screw or one lever plus electric connections.)by MKSA - General
Quotedc42 I don't like groove mount either. For the Smart Effector, E3D makes us a modified heatsink with a screw top: which makes it straightforward to fit: E3D has said that they are going to offer this heatsink variant as a standard option sometime in the future. You should replace the hex nut by a tall knurled nut that could be turned by hand. Easy and no need to use a monkey wrench inby MKSA - General
As someone proposed it somewhere, use a Bowden for the support filament and a direct extruder fro the "build".by MKSA - CoreXY Machines