Quotestrips With speed I meant total print speed. That's really what's relevant Of course you did! It is also obvious that the answer is not that simple since the parameters like platform weight, stepper motor torque, printer size, the printed model shape (is it one big solid piece or does it have a lot of holes), frame strength .... etc all interact. In general we want high acceleration to lowby hercek - Delta Machines
I'm thinking about building a robust delta with at least an option to have a full extruder at the platform (mounting plate). Heavy head means smaller acceleration. And smaller jerk. It does not really impact the maximum speed (except if max acceleration is too low you may not achieve the maximum speed at the width of the printer). Print times will be bigger with low acceleration. Just a guess:by hercek - Delta Machines
It can be caused by fluctuating temperature of bed/hotend too. Height of bed/hotend changes a bit with changing temperature and this is the result.by hercek - Delta Machines
QuoteMils24However Im not too sure what you mean with your last point? In repetier, it is trying some small non-zero values for DELTA_RADIUS_CORRECTION_B. QuoteAlso when you say to adjust the DELTA_RADIUS to get the centre the same as the other points I have already done that. I can get all 4 points to be perfect with regards the paper calibration but its when I try and actually print it startsby hercek - Delta Machines
Ok, so one rod is about 0.35 mm different from the others. My guess is that it should cause at most about the same error in z-height (i.e. about 0.35 mm). The error will be different on different locations of the bed. Anyway z-height wrong by 0.35 mm will result in your first layer not sticking on the places where the head is too high. This wrong rod will also lead to rotations of the platform/hoby hercek - Delta Machines
QuoteMils24 Saying that this high and low movement has changed when my rods were taken on and off, could this mean my rods are bad? I have measured them the other day and they are all the same length however. How did you measure the rods? When you built the rods you should have done it based on a jig. All the rods must fit the jig tightly with about the same force. Then to measure the rod, do itby hercek - Delta Machines
I would say it kind of makes sense that one can leave out calibration of diagonal rod length. It is rather easy to make them precise or even precisely measure them with the help of a jig. It is harder to place (virtual) towers precisely since they depend on the top/bottom extrusions (or plates), the tower brackets, carriages and the centre platform. Errors can add up there more easily.by hercek - Delta Machines
I use T2.5 belts with steel core and I never noticed that they would change their length. dc42, do you use GT2 belts with glass fibre core? (Glass fibre is significantly more elastic than steel.) The method I published requires 8 points to converge properly. At least that was an observation found by Dejay Rezme. He implemented a simulator of incorrectly calibrated linear delta printers and testeby hercek - Delta Machines
The type of error you have looks like wrong diagonal rod and delta radius at the same time. These two errors can partially compensate each other (but not completely). Because the compensation is not complete you get the type of error you see. Also notice that wrong steps per mm behaves similarly as both wrong diagonal rod and delta radius. So, as dc42 indicated, you get it when steps per mm is wby hercek - Delta Machines
As dc42 indicated it is better if the calibration is quick enough so that you can run it before a print in a reasonable time. I would really like that if I would ever mess with the bed. The point is that the calibration will find the best endstop offsets too. And it is nice if it can run on the printer controller. There is already kind of standard interface to run calibration/probing so it willby hercek - Delta Machines
Nice! I'm glad somebody had a use for the maxima script. It was my hope when I published it.by hercek - Delta Machines
Ordinary float glass works OK for me.by hercek - Delta Machines
I do not use Johann's (interpolation based) auto levelling. So I do not know what it can handle. It is not needed if the printer is calibrated well. You need your bed levelled to at least 0.1 mm more likely something like 0.05 mm if you want the first layer to stick well. If your printer is really well built then it is possible to calibrated down to about 0.025 mm.by hercek - Delta Machines
Sorry, I did not read this thread. But if you still do not have it calibrated (probably because simple calibration tutorials did not work) then: If you suck at math: Try to read comments in this file: If you are good at math: Actually execute the file in maxima (you will need a z-probe and you may need my branch of marlin for that). The file will give you the right calibration parameters if yourby hercek - Delta Machines
Marlin slows down when arms are almost horizontal. That is because Marlin limits speed based on carriage speed and not effector speed. Repetier does not slow down; it is controlling speed based on the effector movement and not carriage movement. If you want to calibrate your printer precisely you do not want to have arms much longer than the diameter of the bed. That is because the calibration eby hercek - Delta Machines
It looks like the problem is also partially bowden related, i.e. not precise synchronization between retract/retractReverse and head movement. Smaller nozzles and bowden-less extruder should do better.by hercek - Delta Machines
Quotedc42 However, I'm wondering whether inaccuracies in the tower positions really are a more significant source of error than the towers being not perpendicular to the bed, or twisted, or the diagonal rods being slightly different lengths. Does anybody know? I think it will depend on the type of printer. Traditional Rostock will probably only have bad tower positions and possibly (not probableby hercek - Delta Machines
I have another rule for diagonal arm length: And it approximately corresponds to your 20° rule.by hercek - Delta Machines
Quoteboksbox I tried this and it really messed up. After homing, all the carriages repeatedly kept pushing through the endstops. That is probably because of delta segmentation. One move is segmented to a lot of small moves. Each small move tries to to move through endstop and should immediately find out it cannot move and should stop trying. Anyway, there may be a bug in firmware because evenby hercek - Delta Machines
Quoteboksbox Zmax height on deltas can be misleading. Other than 0, you can't have any other X or Y value when it is on Z max. Trying to jog it in X or Y will raise one or two of the carriages past the endstops. And I don't think the Rich Cattell's firmware has a safety feature to prevent the carriage going past the endstops. Rich's firmware is Marlin derived so it probably has ENDSTOPS_ONLYby hercek - Delta Machines
Quotedc42 On a delta, you should always lower the head sufficiently after homing before moving the head in the X or Y direction. In RepRapFirmware for Duet electronics, the head is lowered a little automatically at the end of the homing sequence; but I don't think other firmwares do that. Repetier's ENDSTOP_Z_BACK_ON_HOME can probably be used this way. It's intention is different but I guess itby hercek - Delta Machines
NickE asked me for this. So here it is: It is a wxMaxima notebook. If you do not know wxMaxima then google some tutorials. There is a lot of them. You can get wxMaxima here: If you are using linux then it is likely your package manager already has a package for it. It is a long time ago when I wrote the document and it was not reviewed so there is a good chance it contains errors. If you findby hercek - Delta Machines
Belt is better than gears because belt is quieter. It is also more expensive.by hercek - Delta Machines
QuoteChrisT88 I'm currently seeing 60mm/second retracts, have you checked yours to find your extruders limit? I usually run about 4.7mm of retract, anymore and I start seeing the width of seams increase on say a vase being printed without vase mode enabled increase. 5:1 gear down is too much. You should try to find something smaller. I use 2:1 and retract speed of 200 mm/s and 10 mm retract. Workby hercek - Delta Machines
You can find carbon rods in almost any rc model shop or a kite shop. It is common material to build air planes or kites. If you are in a bigger city you probably have such a shop locally. You will also find small ball joints in these shops.by hercek - Delta Machines
Quotejaguarking11 Quotehercek Nice. Btw, I do not believe "no lash" is important for a bowden extruder. You get lash of about 8 mm in the bowden, so few tens of mm in the extruder itself does not matter. I am not sure where your getting 8mm of lash from. Can you enlighten me? I used to run 4.5mm - 5mm retraction with 1m worth of bowden tube. The retraction size you need to get no stringing is yby hercek - Delta Machines
Nice. Btw, I do not believe "no lash" is important for a bowden extruder. You get lash of about 8 mm in the bowden, so few tens of mm in the extruder itself does not matter.by hercek - Delta Machines
jmf's 54 N*cm should be enough if he can achieve them. But the specified numbers are typically for 48V and maximum driving current which may be easily even 2.7A. One cannot achieve that with the common stepper drivers we use The result is that the specified stepper torque is almost useless for us. One needs to lookup speed - torque charts for the voltages and the driving currents we use which isby hercek - Delta Machines
I think Airtripper is probably the best choice if your stepper and the driver are strong enough so that you do not need it geared down. But my experience is that the common stuff needs about 2:1 gearing. That is unfortunate.by hercek - Delta Machines
This one can push at least 25 mm³/s if it has proper driving gear for Φ1.75mm filament and springs. One spring should produce force in the range of 20-30 N when pressed. Tested with ABS at 230°C. I did not try to push more than 25 mm³/s because the print quality starts to degrade at about 130 mm/s. The springs and the driving gear on the pictures are not the right ones. Edit: ... and that isby hercek - Delta Machines