I can see that you have not built your corexy yet. After you put those extremely long belts on XY axis you become quite positive about them having zero backlash. My Z-axis belts are shorter than XY ones. And I was printing two of these cubes at the time (in order to let the plastic cool down on the other one). I was using a z-lift of 0.2mm; this means that the bed was going up and down multipleby Edvardas - CoreXY Machines
I have a 1.8 degree stepper. Resolution per full step is 0.05mm. Remember that shaft at the bottom has 40T pulley that is connected to 20T pulley on a motor via endless belt. You could also use this to double the resolution on Andreas design. Remember that reduction ratio also means that your motor needs less force to keep the bed static while not moving. This means that if your bed weights 1kgby Edvardas - CoreXY Machines
I can make a video. My printer is actually a Vulcanus V1 (it is on thingiverse and instructables) that has 1.3kg extruder carriage (three nozzles run by a single motor to print 3 of the same parts simultaneously) and now a Z-axis that has been upgraded. I could upload the Z-axis files. It would actually fit pretty much any corexy printer made of 2020 profiles. Only requirement is at least 32mm gaby Edvardas - CoreXY Machines
Allright So I am actually getting better at taking pictures of these small layers. Here is a comparison against aluminium framed prusa i3 print at the same 0.4mm layer height. As you can see belt z-axis print on the left is way more even. And my prusa actually makes nice prints at 0.2mm layer height.by Edvardas - CoreXY Machines
And now lets look at the test prints I have made. I have used 30x30x30mm cubes with 4mm radius corners. It seems that sharp corners are not good for testing of a Z axis performance as they make X and Y axes slow down to jerk speed. This translates to a slight over-extrusion at the corners. All cubes were printed without infill with 3 perimeters. At the left you can see cubes printed with full sby Edvardas - CoreXY Machines
The way I fixed the belts was copied from the way XY belts are fixed on Vulcanus V1 printer. At the bottom the belts are fixed by pulling belts through 6x2mm slots. Then they are zip-tied. At the top they are fixed the same way but to the plate. Belts can be tensioned by screwing two screws the plate is connected with to the top mount.by Edvardas - CoreXY Machines
There is just one belt on each side. I took Fabrice Z-axis as inspiration so you can see how compound pulley system was implemented on his thingiverse page: Belts are a little over a meter long each. Tensioning is easy as end of belts are connected to a plate. Then this plate increases or decreases the tension by turning screws that are connected to it. Tensioning also levels the bed. I haveby Edvardas - CoreXY Machines
I am the OP of this thread. After all this great information in this thread I went and designed a compound pulley system. As you can see in the pictures my bed is supported by four rods at four corners. I added a compound pulley systems at opposing sides and connected them both by a shaft at the bottom. This shaft has 40T pulley which is run by 20T pulley at the motor. All of this gives me aby Edvardas - CoreXY Machines
How do you like your z-axis? Any comparison to threaded rods or trapezoidal screws?by Edvardas - CoreXY Machines
I see. I guess it might be possible to just use 20x4 pixels but dots are quite much more smaller on graphic LCD so a text would be really small and hardly readable.by Edvardas - RAMPS Electronics
I have the usual arduino/ ramps 1.4 setup together with full graphic LCD, this one: All works fine on my corexy printer up to 30mm/s printing speed but above that 8bit Arduino does not have enough processing power for both corexy movement calculations and information of full graphic lcd. Printer makes short pauses in-between movements. This seems like a well documented issue, especially on Deltaby Edvardas - RAMPS Electronics
Would you consider making required changes to the frame and try build one from laser cut metal?by Edvardas - CoreXY Machines
QuoteAlexY Yeah, I guess the bouncing shouldn't be that much of an issue, but my main concern is the threaded rod not being centered in the coupler; that might be the cause of the slight wobble in prints. These couplers should have no problem compared to the ones that have screws which dig into the surface of the screw and shaft.by Edvardas - CoreXY Machines
Quotehucilu Yes iam from Europě.We have localy avaiable 3030 profiles but i wasnt sure how get sturdiest construction/connection. Well then why not use Motedis? I have been using these corner brackets They do make a sturdy construction but make it hard to make things square. Now I would use these cubes for the corners of the frame and corners of the bed: And as for sturdiness... Vulcanus hasby Edvardas - CoreXY Machines
Quotehucilu That would be great! I wil be eagerly waiting for your answer To be sure,you are building it with smooth rods? I also considered using alu corner brackets simultaneiously with those corner cubes to get best possible results. And i want use lead 2 lead screws connected with belt to stepper motor on the bottom of frame. Yes, I use 8mm rods all around. I wanted to get the printer runnby Edvardas - CoreXY Machines
What are your acceleration and jerk settings in a firmware? I hope you have lowered them as stock on a firmware they are way too high. On Marlin they are 10 000 for X and Y acceleraton and 20 for jerk. I think I have acceleration set at 1000 and jerk at 15. These are the foot that I have on my i3by Edvardas - CoreXY Machines
Some printed springy feet made wonders to my prusa i3. It went from hearable through multiple doors to a printer I can sleep next to. My corexy made of 2020 profiles sits on a metal cabinet and is really silent. I think its because of the TMC2100 stepper drivers that drive X and Y axis.by Edvardas - CoreXY Machines
I was printing for the last couple of years on a Prusa i3 that is made of high quality components (original Prusa alu frame, original j-head hotend). Maximum acceleration is around 50mm/s after which quality of the parts is just unacceptable. I usually (99% of time) print at 30mm/s maximum. I have built a Vulcanus V1. Its direct drive extruder X-carriage weights 650 grams. What surprised me is hby Edvardas - CoreXY Machines
Thats good news. I am looking forward to fallowing your new build. Can you give a link to good information of what quadrap actually is? It seems that corexy and quadrap only defines the motion of X and Y axis. Z axis motion solution is actually not defined by names such as corexy and quadrap and can be easily mixed on both of the mentioned designs. Or am I wrong? This thread might be of your iby Edvardas - CoreXY Machines
Are you sure you do not want to buy a full kit from smartfriendz? That way you can be sure that you will have a working printer quickly. Sourcing all the parts yourself can be a little frustrating as they might not work well with each other. I would definatelly suggest to buy your first printer as a kit that has a good support from the seller.by Edvardas - General
QuoteRichard PV QuoteEdvardas If you get an arduino board make sure to get a 2004 screen with it. A graphic lcd makes corexy movements above 30mm/s erratic. Hi Edvardas, Could you please explain me why add a LCD to the CoreXY would create an error in movements? I thought that LCD only gives a way to show information. Also why you said that if I use an arduino board (Arduino Mega in my case). I mby Edvardas - General
If you get an arduino board make sure to get a 2004 screen with it. A graphic lcd makes corexy movements above 30mm/s erratic.by Edvardas - General
QuoteJ-Max QuoteEdvardasWhat microstepping is used on Z-axis? What is the problem with current 0.2mm per step setup? Is Z0 easy to set and repeatable? I could redesign AndreasL design on solidworks to be used for 2020 profiles and make it all beefier. I would also use 624 bearings for idlers as its size is almost the same as 20T GT2 pulley. Or do you know an European supplier of GT2 idler pulleysby Edvardas - CoreXY Machines
QuoteLarsK QuoteEdvardas Geared steppers are supposed to have backlash, no? Although sli3der 3d printer use geared stepper with a great results. Only a problem if you move the bed up and down doing print. If you just go down ( one direction) the backlash should be irellevant. I do use Z-lift as otherwise nozzle charshes into a print while traveling so that is relevant to me.by Edvardas - CoreXY Machines
QuoteLarsK QuotefilipeCampos ... Modify the setup to have a good reduction and then it will be a great system. Using a geared stepper will give you all those things. Will hold when powered off, very high reduction and low power use - Still very reasonable costs. 2:1 using belts is the limit I think. If you want 4:1 or more then you need to apply real gears... Thus geared stepper. Geared steppby Edvardas - CoreXY Machines
QuotefilipeCampos I agree with you, if you do not have a rigid frame lead screw can be difficult to setup correctly and can not be the best option. This belt system appears to be a lot more forgiving. I was using was example the setup i have, i only use one lead screw. But the missing reduction of the belt system is a deal break to me, i think you need to somehow add a least an reduction of 1:4.by Edvardas - CoreXY Machines
QuoteLarsK QuoteEdvardas ... Here is some information on the correct mounting techniques for leadscrews You can mount a single leadscrew according to A technique but to be able to use two screws driven off a single motor one would need use technique B. For this one would need a high quality perfectly straight lead screw otherwise screw would transmit any irreguliarities to the bed and to the priby Edvardas - CoreXY Machines
QuoteJ-Max To me, the design of AndreasL is just a start. I printed one for dev purpose, and there's several things that can be improved. First, some parts are too thin. Especialy supports and the ends of the arms. The supports have only two screws, and that's not enough. You need at last 3 in triangle. The worst point IMHO is resolution, you only get 0.2mm at full step. That's why I want to insby Edvardas - CoreXY Machines
QuotefilipeCampos Only speaking of the mechanism to move the bed and not the bed structure or linear motion. AndreasL is an interesting concept but i still think the use of lead screw is better. One lead screw of 40cm has cost me 18€ on ebay and more 2€ for the coupler. If you go to the AndreasL solution it will be really cheaper? You still need to buy the belt, pulley and bearings. The total caby Edvardas - CoreXY Machines
QuoteJ-Max To me, the design of AndreasL is just a start. I printed one for dev purpose, and there's several things that can be improved. First, some parts are too thin. Especialy supports and the ends of the arms. The supports have only two screws, and that's not enough. You need at last 3 in triangle. The worst point IMHO is resolution, you only get 0.2mm at full step. That's why I want to inby Edvardas - CoreXY Machines