Hello. I have recently gotten a Folgertech kossel 2020. I have built it, and calibrated it, so now the nozzle is a papers width over every part of the heatbed. Have printed a calibration cube, and the xy direction is too big. The problem is that sometimes when i manually move x and y, one of the carriages just continues down and crashes into the base. This has wore out my rod ends, and there is now a lot more slack than there used to be :( The problem was worse when i set the #define DELTA_DIAGONAL_ROD to 230, which is the length of my rods. I set it to the default of 216, and the problem got a lot better. It still is there though. https://reprap.org/forum/read.php?178,559467,559467#msg-559467 Thu, 14 May 2026 15:30:09 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?178,559467,560703#msg-560703 https://reprap.org/forum/read.php?178,559467,560703#msg-560703 I'm thinking of using countersunk screws on the bed and using a glass plate on top(already bought a borosilicate glass plate)
I should be able to use all the build area if I then put on longer rods and move the powersupply.
How long rods would i need to utilize the full build area on this machine?
I may win some build height back if i use an effector like this one: Infill 3d effector

I may put a bigger plate on in the future, but i might need a 24V powersupply for it. This one barely reaches 100 *C, will maybe be easier if i insulate it.]]> Joeybane Delta Machines Sun, 20 Sep 2015 12:17:05 -0400 https://reprap.org/forum/read.php?178,559467,560574#msg-560574 https://reprap.org/forum/read.php?178,559467,560574#msg-560574 OTOH, longer rods will cause less print height.

BTW, where is the nozzle at x0 y0? Is it at the center of the bed?
-Olaf]]> o_lampe Delta Machines Sun, 20 Sep 2015 04:14:47 -0400 https://reprap.org/forum/read.php?178,559467,560283#msg-560283 https://reprap.org/forum/read.php?178,559467,560283#msg-560283
You definitely need longer rods to reach the far edge of the bed, and you could also get a larger bed too to increase the print area.]]> dc42 Delta Machines Sat, 19 Sep 2015 07:14:42 -0400 https://reprap.org/forum/read.php?178,559467,560275#msg-560275 https://reprap.org/forum/read.php?178,559467,560275#msg-560275 In the other direction I can go all the way over the edge of the heatbed if i want.
[attachment 62574 Resizedprinter.jpg]

I may buy some 250mm rods eventually 250mm rods]]> Joeybane Delta Machines Sat, 19 Sep 2015 06:52:20 -0400 https://reprap.org/forum/read.php?178,559467,560210#msg-560210 https://reprap.org/forum/read.php?178,559467,560210#msg-560210 20° max. angle is common practice. Sure you can add a safety margin, but 75mm radius seems underrated to me.
-Olaf]]> o_lampe Delta Machines Sat, 19 Sep 2015 03:21:31 -0400 https://reprap.org/forum/read.php?178,559467,560085#msg-560085 https://reprap.org/forum/read.php?178,559467,560085#msg-560085 The 230mm rods are not long enough to reach the advertised 210mm build area!
I set the radius to 75, loosing a lot of build volume in the process.

I also had set repetier up for 210mm build area.

However, the xy distance is something i'm still working on. I took all the measurements and plugged it in the newest version of marlin (with G30 autotune)
Calibrating flatness again, will se how the xy behaves after that.

Edit: Yup, now XY is spot on :D
Now to tinker with auto level and/or extruder calibration

Edit 2: Just found out i had slic3r set to 3mm filament on the first cube i printed. It prints beautifully now :D It prints faster than my hotend can heat! Now i need a fan shroud]]> Joeybane Delta Machines Fri, 18 Sep 2015 14:55:41 -0400 https://reprap.org/forum/read.php?178,559467,559958#msg-559958 https://reprap.org/forum/read.php?178,559467,559958#msg-559958 Yup, it moves correctly in the z direction.

230mm from center to center yes.

The effector offset is 25mm, which is the numbers in the firmware.]]> Joeybane Delta Machines Fri, 18 Sep 2015 09:39:55 -0400 https://reprap.org/forum/read.php?178,559467,559796#msg-559796 https://reprap.org/forum/read.php?178,559467,559796#msg-559796
Many people have their effector_offset set wrong, which would lead to a wrong delta_radius.
Effector_offset is NOT the distance from effector center to one of the balljoints.
Think of a virtual axis between two corresponding rods and measure the distance from the axis´ middle to the center of the effector.

Sorry my English math term dictionary is very limited, I can´t explain better
-Olaf]]> o_lampe Delta Machines Fri, 18 Sep 2015 03:44:16 -0400 https://reprap.org/forum/read.php?178,559467,559689#msg-559689 https://reprap.org/forum/read.php?178,559467,559689#msg-559689 nebbian Delta Machines Thu, 17 Sep 2015 18:52:28 -0400 https://reprap.org/forum/read.php?178,559467,559644#msg-559644 https://reprap.org/forum/read.php?178,559467,559644#msg-559644 I'm not moving a single tower, just using repetier and moving it by clicking the buttons.
The firmware stops the movement in some directions, but in others it crashes.
When the firmware bstops it, the coordinates in repetier is off, and i have to home it again.

the problem first appeared when i calibrated the flatness at these points:

g0 x0 y0 z5
g0 x0 y105 z5
g0 x-90.23 y-52.5 z5
g0 x90.23 y-52.5 z5

If my maths is correct, this should be the tower positions for a 210mm circle.
It worked at first, but when i tried setting diagonal rod length to the measured one was when this happened.

But now the x-y axes is printing oversized, which i understand is related to the rod length in firmware.

when calibrating flatness, i just mechanically moved the endstops, don't know if that is the correct way to do it, but i don't know another way without making an adjustable heatbed. (all i would need is 3 springs.
I checked the frame, and it is symmetrical.

Delta printers are really a lot of headache! :P This is my first printer]]> Joeybane Delta Machines Thu, 17 Sep 2015 15:34:04 -0400 https://reprap.org/forum/read.php?178,559467,559612#msg-559612 https://reprap.org/forum/read.php?178,559467,559612#msg-559612
Here is why.

On a cartesian printer each axis is independent and you can freely move one alone.

A delta printer is not so. All three axis work in unison to put the nozzle on a point in 3 dimensional space.

You therefore have to move all three at once.

So here is what I did to help my brain remember this.

In repetier host or prontrface i created buttons to issue a G1 command with all three x y z numbers. This i setup for each tower. Now when I manually calibrate i press X tower button and it goes to the same point every time.

Avoid moving just one axis because the machine was not designed to understand a single axis horizontal movement.

Cheers!]]> thetazzbot Delta Machines Thu, 17 Sep 2015 13:56:00 -0400 https://reprap.org/forum/read.php?178,559467,559467#msg-559467 https://reprap.org/forum/read.php?178,559467,559467#msg-559467
I have recently gotten a Folgertech kossel 2020.
I have built it, and calibrated it, so now the nozzle is a papers width over every part of the heatbed.
Have printed a calibration cube, and the xy direction is too big.

The problem is that sometimes when i manually move x and y, one of the carriages just continues down and crashes into the base. This has wore out my rod ends, and there is now a lot more slack than there used to be :(
The problem was worse when i set the #define DELTA_DIAGONAL_ROD to 230, which is the length of my rods. I set it to the default of 216, and the problem got a lot better. It still is there though.]]> Joeybane Delta Machines Thu, 17 Sep 2015 06:40:47 -0400