It would be interesting to produce thinner filament on-the-fly from 1.75 mm or 3 mm filament, i.e. remelt into thinner filament before it moves into the hotend. This remelt should be done protected from oxygen. You could - change the filament diameter to fit your nozzle diameter and layer height, throughput - mix filament with other filaments to get true color or material mixes anlogue to alloysby JoergS5 - General
Dexion has many holes, so you can easily stabilize the structure by connecting it into triangles. For the look, you could paint the Dexion parts black (.e.g. paint spray) and add some nice coloured printed 3d parts. Or you have a favorite soccer team/football ... and choose those colors.by JoergS5 - General
The limit for Duet is 2.4 A and you can set up to 80% of the stepper current/phase. If you go to the limit, you have to cool the Duet.by JoergS5 - General
Quotethe_digital_dentist 31.0 mm +/- 0.1 mm. This +- 0.1 mm was what the author talked about as being inexact (but not only this tolerance, but the screw hole itself is wobbly). He used a hair ruler to line up the shaft with the stepper shaft, and the tolerances were about 1/100 mm. But not so important for 3d printing.by JoergS5 - Mechanics
An easy construction could be a steel pipe, put over the stepper shaft and fixed with a screw. A steel pipe, because you may find a precision pipe without seam/suture (ohne Naht). E. g. ebxx "Präzisionsstahlrohr Präzisionsrohr nahtlos E235 Blank Länge 1000mm" with a diameter of 10 mm and thickness 2.5 mm. Then you have an inner diameter of 5 mm. It may be easier to use a stepper with a shaft wiby JoergS5 - Mechanics
Mixing them would be funny, but not so useful. It's a good idea. A cable systems makes it easier with respect to all those needed pulleys. You can guide the wires easier than belts. Good luck for your first 3d printed curry wurst!by JoergS5 - CoreXY Machines
Maybe it's easier to use one nozzle / diamond / 3in1 nozzle solutions and improve how to retract the filament for exchanging or mixing filament. This way you win the possibility to mix the filaments for true color and ease printer construction. There are 3d printed routers with coolant channels, there could also be even more specialized nozzles for 3d printing.by JoergS5 - CoreXY Machines
Quotethe_digital_dentist The holes are placed symmetrically around the motor shaft. If they weren't you would be forced to position the motor in a mount in a specific orientation. Who would want such a thing? I have made many motor mounts for NEMA standard motors, always using symmetric screw hole locations, always fitting perfectly. Even if the distances between the pulleys and the shaft werby JoergS5 - Mechanics
Quotethe_digital_dentist Belts normally load the motor shaft on one side. I don't know why, but people who play with cables seem obsessed with the motor shaft loading. The reason for this is for me, that the stepper inside has ball bearings and a load on one side will disturb the function of the stepper. Like a direct stepper - shaft connection which destroys the stepper (the reason for loose cby JoergS5 - Mechanics
In the original design and in this this of Olaf one main problem is the high friction of the main shaft. I am thinking about how to solve this. I will try your proposal of a bigger main pulley. My understanding is that the 4 corner pulleys (or the pulley aside of the main pulley in the original construction) have only one task: guide the wire one winding up.by JoergS5 - Mechanics
I thought a bit about your setup. The reason why your middle shaft is working bad may be: I read somewhere that the four corner screw holes are not positioned exactly (it's only the circle around the middle shaft which is positioned exactly). So the distance of each corner may be a bit different to the middle shaft. So the tension will vary heavily when you turn the shaft (distance of incoming aby JoergS5 - Mechanics
Another idea: the screws at the 4 corners: if they are tilted a bit they can lower the force needed. The wire coming from the pulley and going away has a little slope/pitch, you can lower the friction inside the pulley by making the shaft a bit tilted. The tilt is easier to achieve with the cage: the holes at the other side with a little offset.by JoergS5 - Mechanics
To guide the wires, I thought about using a steel mesh or a spiral. The wires must be forced to a specific angle between corner and the middle. In your case the wires force each other into this angle, but you have friction and maybe abrasion. So putting something glossy/glibly between the wires lowers the friction and abrasion. If you lower the friction between the wires, your middle axis needsby JoergS5 - Mechanics
You make interesting experiments! When you are successful,I will try it also. One idea is to use longer screws in the four corners and stabilize them to put it into an aluminium cage, similar to the stepper cages of digital dentist. So the axes cannot bend. This will allow mounting of the stepper at the top side as well.by JoergS5 - Mechanics
Hello and welcome to the forum. I would buy a 24 V power supply, they are really cheap. You can lower 48 V to 24 V, but this costs energy (transforming or wasting energy by a resistor). Personally I would buy a bit more expensive one, PSUs from Mean Well have a good reputation. There is a model for 24 V without fan, which is a silent solution (LRS-200-24). For heater cartridge: most plastics meby JoergS5 - Let's design something! (I've got an idea ...)
QuoteYuvera There's a whole other part to the project. The printer has an enclosure which has a door that is opened by the printing bed moving forward at the end of the print. So if the print is paused, the door wont be opened and the printer wont get wet. If the end of the print is the only reason to install a rain detector: I think the reason why your door opens is because your printer is homiby JoergS5 - Printing
Danke! (thanks ;-)) P.S. drilling is NOT boring ;-)by JoergS5 - CoreXY Machines
I reviewed Dice: it achieved 1000 mm/s and 10000 mm/s², but without extruding! Sorry, I was not observing enough. And he uses small pulleys, which supports your words.by JoergS5 - CoreXY Machines
I read at the DICE description about 800 mm/s speed and wondered how he achieved that. Edit: ok, I checked the video again: the speed test is without extruding :-) I found a ball bearing fitting could be a 6301: 12x37x12, so you need only one at each place, even with 9 mm belt. I would use a 12 mm shaft directly with locking rings. In a CNC forum I found an information about so called "balligeby JoergS5 - CoreXY Machines
Thank you for your opinion. I am still not sure what I will do. I want to be flexible with pulley sizes on the stepper because I don't know which speed is possible maintaining a good quality print. It will be trial and error, I did not see a mathematical model anywhere to decide this. For example, is it possible to use 60 tooth pulleys on the stepper and run full speed? Same uncertainty is withby JoergS5 - CoreXY Machines
Quotethe_digital_dentist I want to rebuild your CoreXY construction but think about a modification, adding two pulleys: The stepper can be a bit more right (left stepper) or more left (right stepper). The additional pulleys are good for: - easier align the three pulleys which must be in one line (4 identical housings, no belt thickness calculations, one pulleys axis line) - tensioning of sby JoergS5 - CoreXY Machines
I will try Fusion 360, thanks for the hint.by JoergS5 - CoreXY Machines
Have you found the idea of diagonal struts by chance or by mathematical calculation? I am still searching for a good freeware simulation program to optimize struts construction, especially in respect of vibration effects (how to minimize stepper vibrations e.g.). The program Z88 is a good program in this direction, but has still some limitations at multipart and dynamic calculations.by JoergS5 - CoreXY Machines
Your extrusion construction of the diagonal struts reminds me of the geodesic dome. This may be a reason for your good print results.by JoergS5 - CoreXY Machines
QuoteMKSA QuoteJoergS5 QuoteMKSA QuoteJoergS5 QuoteMKSA The advantage of having only one motor is that you don't need to "de-rack" and provided your machine is of a good design, rigid, properly constrained, accounts for thermal expansion, built with the proper components, you don't even need z-probing/auto bed leveling. ... By calibrate I mean small steppers who change two Z parameters and fixby JoergS5 - CoreXY Machines
QuoteMKSA QuoteJoergS5 QuoteMKSA The advantage of having only one motor is that you don't need to "de-rack" and provided your machine is of a good design, rigid, properly constrained, accounts for thermal expansion, built with the proper components, you don't even need z-probing/auto bed leveling. ... By calibrate I mean small steppers who change two Z parameters and fix it (fixing by using worby JoergS5 - CoreXY Machines
I think the reason why so many printer constructions use ABS, PLA etc. is - the historical RepRap idea to replicate parts with the printer, so a lot of commercial ones use it - a lot of thingiverse things want to improve the printers (rail/guide connections, extruder holder etc.). What do you print first if you have a printer? A new part for your printer... - users are afraid and not used to cby JoergS5 - CoreXY Machines
QuoteMKSA The advantage of having only one motor is that you don't need to "de-rack" and provided your machine is of a good design, rigid, properly constrained, accounts for thermal expansion, built with the proper components, you don't even need z-probing/auto bed leveling. I would take your rules of construction and add an automated measure + calibrate possibility. Then you have a low maintenby JoergS5 - CoreXY Machines
Quotethe_digital_dentist XCR3D (also Chinese made) hot-end I was looking at the XCR3D, in the german ebay is a comment that the cartridge heater is ok for 350 °C, but the hotend shall be used only up to 240 °C, a high temperature version will be available in the future. Seems to be the same version like on alixepress, as he advertises using a german imported cnc machine in both offers. Just wanby JoergS5 - CoreXY Machines
If you clay doesn't work, you could use zeolite also, it is available in different grain.by JoergS5 - CoreXY Machines