sorry folks. have had a new contract since january that has sometimes taken more than 100 hour weeks.... sorry I have dropped the ball on this....by patrickrio - CoreXY Machines
I too have been using this filament. Zero Jams. very consistent diameter. It is interesting because it seems to be stronger than other PLAs I have tried. If you try to break a piece of filament off the roll, you have to bend it back and forth LOTS before you can break it. It acts like it has little strings inside that won't break. It does leave more strings during printing than the other PLAs Iby patrickrio - Reprappers
Almost any Cantilever Z axis will have a little bend at the open end if you push hard enough. the trick is to make that bending motion take enough force that your extruder can't push that hard during normal printing. You also need to make sure that what vibration it DOES have damps out quickly and does not have a resonant frequency in your printers range of vibration. Since the linear guides canby patrickrio - CoreXY Machines
dual motors can get out of sync which will cause the bed to lose its carefully set level. Don't get me wrong, you can make it work. However, this is a calibration and selection guide for creating a highly accurate CoreXY printer. the possibility of losing a step or even a microstep in one motor and not the other makes the dual motor system a less accurate choice in my opinion and the opinion of mby patrickrio - CoreXY Machines
I stuck with MDF, yes. I think in the long run, that will make it easier to create a heated/abs filtered enclosure. It is heavy though, and parts sizes would not make it good for a mass produced printer I think. My design has a VERY reduced part count as a test of different ideas, and I would back of on this a little as outlined below. HOWEVER, my printer works very very well. the movements shoby patrickrio - CoreXY Machines
I saw a printer at Maker Faire NYC that supposedly used rotary encoders instead of steppers. Mod-t 3D Printer it is a beltless design. the printbed is made out of a material that works well with PLA at room temperature without a heated bed. X and Y were rack and pinion controlled, with the racks molded right on to the solid one piece printbed. The printbed can be lifted off the gears and then pby patrickrio - Mechanics
I have ordered levered mechanical, leverless mechanical and the A3144 sensors. Testing will ensue upon receipt.by patrickrio - Delta Machines
Hey LarsK, For putting pics directly into text, I have been posting fotos to Imgur.com and then copying the "direct" link URL into the button for pictures on the taskbar above the message you are writing. works great.by patrickrio - CoreXY Machines
going past 90 should work fine geometrically, since you have 3 arm pairs positioning the nozzle you still can exactly position the nozzle.. the question would only be if the firmware is capable of it and if the arms will run into anything going past 90 degrees.by patrickrio - Delta Machines
LarsK, I thought about your problem a bit more, and the biggest problem you have is availability of a cheap, small and durable heat source. I think pulling nichrome wire from a Brazilian electric shower is not the best idea either, and when you combine it with all the work of making an oil heater.... kind of too much I think. When I think about it, the cheapest small heating devices that are evby patrickrio - CoreXY Machines
OK, I put some information on the document, but will now be taking a 5 day break because I have an office move. Feel free to post more existing guides and test objects to include in the document. Thanks!by patrickrio - CoreXY Machines
I modified a convection toaster oven with PID control for testing the melting point of tin alloys. It had a maximum tested temperature of 600F/315C. I used Kiln wool insulation inside the toaster (outside the heater coils) to keep the radiated heat loss low. I was keeping 2 degreeF/1degeeC accuracy throughout the heated volume. The toaster idea will work great... maybe buy a cheap toaster convecby patrickrio - CoreXY Machines
These? So the switch ends up being the cost of one of these, cost of a connector to connect to one, and a magnet?by patrickrio - Delta Machines
I too used a large object to test XY accuracy, but did not yet test Z height accuracy mainly because the calculated XY values were exactly correct so I assumed I got it right for a belted Z axis too. Bigger things to measure is generally better. I tested my extruder by extruding 3 meters of filament with the nozzle removed and measured length to .5mm accuracy. I am going to do the whole calibraby patrickrio - CoreXY Machines
There are some differences in calibration for CoreXY from other printers. 1. both XY motors turn equal revolutions for any pure X or Y move. which of the 4 directions is determined by direction of rotation between the two motors. 2. Many of the existing CoreXY printers have belted Z axis movement with a cantilevered bed. Most printers in Triffid's guide have single or double motor screw driveby patrickrio - CoreXY Machines
Hi JustAnotherOne, This is a very interesting project. Do you have a general idea of what price point you are going to be able to hit on this??? Also, I think you should re consider having ethernet on the board. I get that octoprint is a more comprehensive ethernet solution, but having ethernet capability onboard is something I use all the time with my Duet controller, even though I have a Rasby patrickrio - Controllers
Thanks Dentist.... I knew you would have figured out a good procedure list. I will make the mods to the doc later today.by patrickrio - CoreXY Machines
yes, differential inside an object versus outside could be a problem. I think you would use higher chamber temperatures with convection though, since it can be quite accurate. I think your goal with Forced Convection Heating would be to try to keep an object JUST structurally sound enough to support the layers above without sloughing or bending due to weight or extruder forces. You might then Sby patrickrio - CoreXY Machines
I am not worried about losing build height with mechanical switches. As dc42 suggests, it is easy to change the design around so that the microswitches do not rob you of print height. Most important is repeatable accuracy. Is the consensus here that small mechanical switches with short levers are just as accurate as the leverless mechanical switches??? within one microstep seems pretty good....by patrickrio - Delta Machines
If you have a guide that is already made for gantry systems you can point me to I will eliminate the steps for that and just list the guide for all applicable steps. However, so far I have found that information is found in many different places, and I have yet to find a full calibration guide that also lists links to all the appropriate test prints. My idea is to create a very good guide withby patrickrio - CoreXY Machines
Hi All. I want to start designing a definitive CoreXY calibration guide. To that end, I have created a document on Google Docs that everybody with the below link can modify to improve: CoreXY calibration guide draft on Google Docs Please give me links to the best existing guides and test objects, and feel free to modify the Google Document and or make suggestions here. When suitably completeby patrickrio - CoreXY Machines
Hi, I have a bunch of switches already, but want to select the best, cheapest endstop solution for my micro delta design. I have read that you do not want mechanical switches with arms because of insufficient accuracy. I have some optical switches, are these the best option? For my printer they are a large part, so if there is no accuracy difference, a microswitch without an arm may be smaller,by patrickrio - Delta Machines
Thanks once again David/dc42by patrickrio - Delta Machines
Is there a reason why you would not want lots of air current inside a heated chamber? In my thought experiments, I thought it would be better to have a construct more like a convection oven. High amounts of air current allow the air in the entire chamber to be the same temperature; and because the air is moving, you always have the same air temperature next to your object which normalizes temperaby patrickrio - CoreXY Machines
I was all exited that someone had put together a comprehensive delta calibration guide..... would be very helpful!!! too bad about the 403.....by patrickrio - Delta Machines
Ok, here is the drawing. in the drawing each square=5mm per side The Pink squares represent the limit of movement for the carriage at the tower points. The Black circle represents the build area circle. The Blue dots represent the center points of the effector joints in a 3 ball system. The Green circle represents the path traced by one of the effector joint center points when the nozzle traby patrickrio - Delta Machines
Dentist, all good points. And to your point, I am also using my rails in ways that would make the manufacturers cringe. I am not chastising you for doing the same thing, believe me. However, I do think that when I do my next CoreXY i will likely use a plate like you are. I also think that machining 2 parallel lips might not be very expensive on such a plate. If the cutout and holes of the plateby patrickrio - CoreXY Machines
I am actually working on my Delta design that uses these rails now. A big advantage of the Delta design for linear rails is that NONE of the rails are paired, so you do not have the same problems with being parallel. Sure you WANT them parallel, but you will not affect product life or warranty if they are not parallel.by patrickrio - CoreXY Machines
Here are the descriptions and drawings from the IKO manuals... similar stuff in other manufacturer manuals...by patrickrio - CoreXY Machines
figured out the minimum arm length conceptually with some very ugly free hand drawings. I will do a nice drawing tomorrow and post it.by patrickrio - Delta Machines