It's recommended that you get 180 degree of belt loop on driven pulleys, to prevent tooth skipping under load, especially during accel/decel. CoreXYU better balances the loads, not perfect, but does give you a second X carriage to play with. You can find the math here: Hlidskjalf CoreXYUby prot0typ1cal - CoreXY Machines
IMHO the idlers need to be supported top and bottom. Post styles always seem to flex and the idlers twist. Recently went thru a major redesign on my coreXYU for this very problem.by prot0typ1cal - CoreXY Machines
Thanks for your RADDS supportby prot0typ1cal - Firmware - mainstream and related support
Sorry for the bad graphic perspective... 2 ballscrews per side. One rail per side on Y axis. X motors travel on individual gantries. Probably a more elegant way to arrange them.by prot0typ1cal - CoreXY Machines
Just an observation. You're going to have a lot of wasted space occupied by the parked gantries. Belt stacking is also going to be a challenge. Because of the mass of the head you may be better off using ball screws. Above and below Y rails could make four gantries possible. With travelling X motors on the end with the Y nut.by prot0typ1cal - CoreXY Machines
QuotePippy That's a lovely machine prot0typ1cal ! Do you have a video of it working I wonder ? Old video, nothing recent: CoreXYUby prot0typ1cal - CoreXY Machines
This is an old pic, from an ongoing coreXYU project: Been using 2:1 belt for awhile. Mine's a 40T to 20T pulley with a 9mm wide belt. Reason being the main dive belt is steel core, and requires a larger pulleys throughout. My gantry also weighs a lot, with 2 steel rails and 2 direct drive carriages, so the extra torque was needed. While the OP with the double run looks intriguing, and worth a tby prot0typ1cal - CoreXY Machines
Suggest you consider the E3D toolchanger and sign up for the beta package. Straight up coreXY with DUET. Can't ask for better collaboration. Kinda pricey, but mitigates some of the risk.by prot0typ1cal - CoreXY Machines
The taller the section, the better for X. Height, not width, is more important for beams. L shapes will help for higher accels/decels in the Y. Under the Y rails, I'd go thick enough to thread the M3 used to secure the rail. Non-moving so weight will help there to dampen vibrations. Yea, FIR would require a IR camera to regulate. Though just a hand held IR laser temp sensor will be enough to setby prot0typ1cal - CoreXY Machines
You could move the AB motors down on the base, outside the enclosure, by using vertical shafts to the pulleys. Yes, more bearings. Plus water cool the hot end and direct drive extruder motor for longer life/better control. Laminating another piece of steel under the aluminum plate, that's under the linear guide rail, may reduce the bow/warp from the difference in the CTE. Or just use stainless pby prot0typ1cal - CoreXY Machines
WOW, .02mm layer height First I was like, 0.2 (zero point two) big deal (sarcasm), then it hit me, POINT zero two. BAM! 75mm/sec print speed is respectable. Nice plug for the Duet. The e4d tool changer would be a prefect upgrade for this kit. Very nice for the price.by prot0typ1cal - CoreXY Machines
How about RamXY?by prot0typ1cal - Mechanics
Look at CoreXY Drawbot. Crazy Engineer's Drawing Robot Main problem is the cantilevered load, and asymmetrical forces.by prot0typ1cal - Mechanics
Looks awesome! You got a shaker to "reset" between prints?by prot0typ1cal - CoreXY Machines
Quotepiper3d Quoteruyvieira It's not a corexy however, it's a stacked cartesian or whatever it's called like BCN Sigma But it should be easy to implement it in coreXY. Yea, it's called coreXYUby prot0typ1cal - CoreXY Machines
Might be cool to use a nanodots gyro (spinning magnetic orb) instead of the solid ball, might have a smoother motion, or not....by prot0typ1cal - CoreXY Machines
Robot arms would be best suited to 3d printing a single object with multiple heads simutaneously, as a multi-head gantry system would get in its own way far too often to be of any real benefit. The slicer would be the biggest hurdle, that and getting some robot arms with enough precision to be worth even trying. Though I've seen videos of such a beast with two robots, can't find the link.by prot0typ1cal - CoreXY Machines
diatomaceous earth is fine, white and doesn't clump. Get the garden variety, much cheaper than food grade. Cool projectby prot0typ1cal - CoreXY Machines
Looks pretty sweet! Makes me sad to have spent so much time on CoreXYU No reference to the final price, so making a deposit is questionable. Perhaps the firmware will be open source so I can convert my CoreXYU to a tool changer? Sounds like maybe the tidbits will be offered seperately instead of a complete kit... Yea, I'd have to ditch the RADDS/Due for a Duet, but hey, be worth it.by prot0typ1cal - CoreXY Machines
A few "thin" gyroid prints reveal the same issue with bidging, mind you this is not using any infill plugin, just STLs. If the shape was slightly altered so the bridges were at rising 45 angles, rather than round, it would knit better...by prot0typ1cal - General
Really don't see this as a "good" infill, as there's considerable start/stops and bridging to complete the structure. Yea, if terminated at aesthetic surface boundries it looks cool. Compared to linear infill it will be not as good for creating flat ceilings, as a linear grid provides a more stable support. Besides, unless the structural analysis turns out to be magically superior, it's pretty mby prot0typ1cal - General
Interesting concept. Reminds me of the J-Rev 4 independently driven ballscrews does have the benefit of being able to software leveling. Tough two rods (or guide rails) on either side would help diminish Z banding, if there was any run out on the screws. Also, since you mention an enclosure, best if all framing structural elements were steel, just for the sake of thermal expansion. Yea, and thby prot0typ1cal - CoreXY Machines
Looks pretty sweet! I'd go for larger idlers if you can, just for belt life.by prot0typ1cal - CoreXY Machines
Easiest way to attach plate to rail is used countersunk holes and flathead screws. Word, metric stuff is typically 90 degree c-sinks. Plate needs to be thick enough to accept the countersink, and have enough, yet not too much, screw length into the slot for a T-nut. Considering most likely tap the plate for the rail bolts, it'll be at least 1x diameter of the screw diameter thick for a decent thrby prot0typ1cal - CoreXY Machines
Careful about going to larger extrusion, as the rail might be too small to straddle the slot. MGN12s just barely cover slots in 20 series, and want to use M3 bolts. So unless bolting another plate over the 3030, with a shallow tight fit slot and tapped M3 holes, you may want to consider 2040 or larger 20 series extrusions. Absolutely would need solid plate if using MGN9s. Yea, cheap Chinese railby prot0typ1cal - CoreXY Machines
QuoteSpeaker-2-Animals @prot0typ1cal When googling around for ideas for printers I came across pictures of your Hlidskjalf and it inspired this one even though mine won't be nearly as impressive. Yes those are 9mm belts on the gearing but it's 3:1 ratio 60 and 20 tooth pulleys. Based on your experience do you think 3:1 is too much? I know it's going to limit travel speed but I think print speedby prot0typ1cal - CoreXY Machines
I used the same 20 to 40 pulley on my printer. If my eyecrometer is calibrated right, Looks like you're already planing to use 9mm closed belt for this.by prot0typ1cal - CoreXY Machines
A tool changer. Collets are a PITA.by prot0typ1cal - General
Use 3 ballscrews, with independent motors. Not only will small "Z-lifts" be fast enough, you could use a Duet board and get the auto-level function for FREE ! If you're concerned about the weight, larger motors or a belt ratio will work well as the Z speed doesn't need to be as fast as the XY. Z lifts are typically very small, around 0.2mm. For a 1605 ballscrew that would be around 15 degrees rotby prot0typ1cal - CoreXY Machines
Reminds me of a Folgertech FT-5, only the FT-5 uses two motors for Y to move the extra mass of the gantry.by prot0typ1cal - General