QuoteNathanaelXYZ Quotethe_digital_dentist I wonder how they manage the difference in thermal expansion coefficients of the diamond and brass that it's mounted in... The kickstarter page mentions that the nozzles should not be used above 300C-- assuming they install the tips to an interference fit by heating the brass, perhaps this is the point at which the diamond is at risk of coming loose? Bby rq3 - Tech-Talk
Quotethe_digital_dentist I wonder how they manage the difference in thermal expansion coefficients of the diamond and brass that it's mounted in... I don't know. From their images, it appears that the diamond itself is conical, and fits a conical recess in the brass. There doesn't appear to be a retaining ring of any kind. It may actually be brazed in place (which might explain the temperature lby rq3 - Tech-Talk
For whatever reason, USSupply. who has been manufacturing industrial diamond products for decades, has a Kickstarter campaign for their "Diamondback" 3D printer nozzles. They certainly don't need the minor funding, but, what the hey, I signed up and I'm expecting my 0.4mm diamond nozzle in November. It's cheaper than an Olsen Ruby, and unlike an Olsen the diamond itself seems to have been manufacby rq3 - Tech-Talk
I've been using a home-brew piezo sensor firmly glued under the bed on my delta for several months. It works very well. Very rarely on an M48 probe repeatability test, it would skip a few motor steps, and the same might happen during delta calibration and bed leveling. The bed on my delta is very securely fastened to the frame, and quite some time ago I took pains to ensure that the bed could exby rq3 - Tech-Talk
QuoteMustang66 Well, still don't know why can't attach a file that's 5 or 7 mb when it says largest is 8mb but: I figured out the problem with my Markforged_XZ addition to marlin.It now operates the same as _XY does except with the z axis instead of y axis. If anyone is interested let me know. The RepRap forums say they have a maximum file size of 8MB. It's really 800KB (0.8MB ). You're limiteby rq3 - Firmware - Marlin
Attached are the files I use to actually make the VDE-100 (schnekenstruder) as it exists on my delta printer, along with a short descriptive paper.by rq3 - Tech-Talk
Sorry for the new post. For some reason I can't edit my BOM post. Attached is the STL file for the 5mm axle bearing carrier, edited and tuned to 1 micron. I print this directly in PLA at 50 micron layer height with a 0.4mm nozzle. I slice with the latest Cura with the Arcwelder plugin, 100% concentric infill. For those designing the CAD file directly, note that every time you move the origin axiby rq3 - Tech-Talk
Quotedekutree64 I've decided to go with the canted axle/sharpened bearing flange approach. I'm not sure my mill could handle boring out a 10mm steel screw, nor do I have an easy way to get it centered and vertical under the spindle, so I'm going to have to make some new fixturing regardless. And the bearing should be sharper and longer lasting. I'm using a 4x8x3mm flange bearing because it's whaby rq3 - Tech-Talk
Attached is the Bill of Materials for the Very Different Extruder (VDE-100), or SchnekenStruder. These are all common industrial parts, and require no machining with the exception of: 1) The Belleville washers act as preload springs for the bearings, and need to be stacked together, spun in a lathe, drill press, or a drill mounted in a vise, and ground with a dremel tool abrasive disc to an outsby rq3 - Tech-Talk
Quotedekutree64 Thanks, that confirms my thoughts. I probably could make a fixture to mill/drill the tilted axes on my 3DOF mini-mill, but I'd actually prefer the higher effective gear ratio since it should allow using even lighter motors. There is one seller for pancake NEMA11 on ebay, though it costs $25 with shipping, and has a 4mm shaft, which doesn't leave much meat after drilling a 2mm holeby rq3 - Tech-Talk
Quotedekutree64 Brilliant design! Might actually be light enough to convert my SCARA printer to direct drive. I have a 50 gram round NEMA14 I could use. And TMC2209 drivers, so I can adjust the microsteps to whatever works best. I'd prefer to use non-canted axles so I can make the carrier out of aluminum, but would all three rollers need to be threaded then since the filament would be getting draby rq3 - Tech-Talk
QuoteVDX ... there where/are some other versions too around -- it's an older principle, patented 1952 by a Mr. Uhing for moving spool-heads on horizontal axes ... but could be used for other tasks too Especially this "scewed tap-rollers" were sometimes used for special high precision CNC-applications ... I'm not sure what you mean by "screwed tap-rollers". The Rohlix linear drive is commercialby rq3 - Tech-Talk
Quotethe_digital_dentist rq3: This looks quite similar to your extruder: Yes, mentioned and linked to earlier in this thread. However, my drive rollers are not gear syncronized. Completely different design, unless we all want to give credit to Archimedes. And I do. Generally there is rarely anything new under the sun, which is part of what makes the current patent system unworkable. Different tby rq3 - Tech-Talk
QuoteVDX ... my own designs are named something like "RollRing..." for the German name ... maybe something with "...spin..." or "...spinner..."? I have a small woodworking tool known as a "gimlet", basically an auger with a screw point, driven like a screwdriver, used for making tapered holes for wood screws. In German it's called a "schnekenbohrer", or something like that, meaning drilling snaiby rq3 - Tech-Talk
Quotethe_digital_dentist That looks like ringing, caused by flexibility in the mechanism and the moving mass of the extruder carriage, not the vertical banding that people think is coming from the gears in the BondTech extruders. I agree, but as I say I haven't pursued the root cause. I guess I could start by doing an extremely slow print and see if there is any effect. I just don't want to starby rq3 - Tech-Talk
Quoteobelisk79 Is the edged roller you are using custom cut on a lathe or something off the shelf you bought? It's custom cut out of 10mm bar stock, bored either for 8mm bearings, or 4mm for the shoulder screw as a "bearing" during development. I then make one pass with a 60 degree single point threading tool, reverse the stock, and make another pass until I get a knfe edge around the diameter.by rq3 - Tech-Talk
Quotethe_digital_dentist Take a look at this thread at Duet forums, then look at your prints- do you see any of the "woodgrain" or vertical banding in your prints? Woodgrain, no. Vertical banding yes, no matter what extruder I'm using. I've always attributed it to improper acceleration and/or jerk settings, but its never bothered me enough to spend time on. I probably will now that I have to playby rq3 - Tech-Talk
I like "spinstruder", or maybe "screwstruder". God knows I'm no marketing whiz, but there is actually a method to my madess. The first three letters are an acronym that describes (at least to me) the function of the product. VDE=Very Different Extruder. TAP=Totally Accurate Piezo. The following three digits are a revison number, like software. The first pass at the idea gets assigned 100.by rq3 - Tech-Talk
Yes, retraction works well, and was part of what drove me to the single drive roller design. Having a single thread start on the filament is critical, and the drive roller is allowed to "float" axially to ensure that it will always re-engage with the previously cut groove in the filament during retraction. I did have to reduce the retraction amount and the acceleration. The acceleration I can uby rq3 - Tech-Talk
Mike, the extruder itself (motor, drive mechanism, and groove mount adapter) weighs 100 grams. 70 grams of that is the motor. A NEMA14 or 11 would also work, but I don't see them in a "pancake" format. For those who have been following this exercize, I started out with a three bearing "Rohlix" design, with the intent of texturing the bearings. Many iterations later, the "final" prototype has twoby rq3 - Tech-Talk
A short clip of the VDE-100 in action on a delta, using the original heatsink to keep variables to a dull roar.by rq3 - Tech-Talk
Fade height only tells the printer how to gradually decrease its bed leveling data as the layers increase. In other words, once you have a good, even layer then bed leveling is irrelevant. Even though the bed may not be level, the layers are, as far as the nozzle is concerned. If you have access to fade height, I'm assuming you are using Marlin? Somewhere you have told it that it is not allowedby rq3 - CoreXY Machines
Mike, I don't know what printer firmware you're using, but if it's Marlin, there is an "interrupt enable" function that is disabled by default. If your control board can handle it (most 32 bit boards can), enabling the interrupt function eliminates, for all practical purposes, the delay between receipt of a signal and the controller's response to the signal. In other words, it does away with theby rq3 - Tech-Talk
I have found that my textured Anycubic Ultrabase Pro bed will instantly release a new print if I apply a few drops of isopropyl alcohol to the edges of the print. The alcohol wicks under the print through the textured bed surface, and you can pop it off right away. A quick wipe, and you're ready to print again, without waiting for the bed to cool and re-heat, plus the bed is clean. This works foby rq3 - General
Adding two miniature flanged ball bearings to the threaded drive roller drastically reduces the filament torsion and the motor current. I'm sure a NEMA 14 or even 11 motor would work. No real surprise here. These two bearings are open (no seals or shields) so I can watch them in action (you can just make out a few of the balls under the head of the screw). So the only "custom" part is a short (3.by rq3 - Tech-Talk
This extruder geometry is definitely functional, as I have actually printed with it. Having said that, and dozens of iterations later, a few notes: None of the stepper motors that I have use hardened shafts, which makes sense since they expect a grub screw to be used to lock any applied device (pulley, whatever) to the shaft. And they all have centering countersinks in the shaft ends produced duby rq3 - Tech-Talk
I really like that! Where did you find left hand threaded nuts? Yes, I've printed successfully (see the calibration cube on the previous page), and kick myself for not having a shot of the installed unit. Soon. I've been playing with various thread pitches and skew angles, and have found that I can make the threaded rollers from hardware store bolts, chucked in my lathe and rotated very slowly whby rq3 - Tech-Talk
And are there screen shots anywhere? Many thanks!by rq3 - Firmware - Marlin
QuoteVDX ... for the videos -- I'm uploading my videos to youtube and posting the link ... It's been years since I posted on YouTube, and the process wasn't fun. But here you go:by rq3 - Tech-Talk
Quoteobelisk79 Thanks for the update, mind attaching a photo or screenshot of the new design? I'm in the Navy and on a ship in the middle of the ocean. Due to network restrictions, I have no current means to transfer freecad files to my personal computer from the network to look at what you've done. obelisk79, thank you for all that you do. I have edited my previous post with a shot of the latesby rq3 - Tech-Talk