Folger Tech Kossel Delta 2020 Full 3D Printer Kit w/Auto-Level

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parco
Is anyone else experience this crazy wiggle: [www.youtube.com]
(I do realize it is printing higher than it should)

I'm trying to see what might be the cause, everything is tight and well built. The linear rails are definitely not "butter" smooth, and the other culprit may be the 36 tooth pulleys.

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dnguyenai598
The Slic3r software might be the culprit. Double check your setting. It could be the fill-in or something straight like that. I'm using the 36-tooth pulleys and it's relatively smooth. My only problem is the webbing, probably too high of the temperature on the PLA causing drips, running at 220C which is normally used for ABS. Still a lot of fine tuning left. I'm also added a Greg Wade's filament extruder to increase the torque, and having trouble fine tuning the speed. So more fun and games...

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bjoernkarmann
Hello Reprappers

I got my FolgerTech Kossel 2020 a week ago, and the build went good. After some research i found the firmware, for Repetier Host (windows) 0.91.

My problem is that a the firmware seems "right", but the distance it travels when using manuel control is, way bigger in the Repetier program, whene going home, it looks more like a crash!
I run with 36 teeth pulley, GT2, 44,44 mm/step, the motors are 1.8 degree NEMA 17. (when traveling z up, at 0.1 it jumps over a step every second time)

I dont know which setting i should change, to configure the motors? Any information or if anybody has the same problem?

Thanks!

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rtideas
And once again, coming up short with this kit. The leads for the hot end are too short. Grrrrrr.
What gauge wire do I need to add extensions to the hot end heater wires?

Needs about a 25-30cm more of wire.
[attachment 47343 image.jpg]

Already had to make extended leads for the fan.

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rtideas
The acrylic parts are definitely beta. One of the hot bed mounting pieces was missing a hole completely.
[attachment 47338 image.jpg]

Any piece that needed to be attached to the frame with t-nuts and the suggested M3x8 screwed barely got a thread to catch. I Dremeled them out so they could get a better bite. First I used a ball shaped reaming tool. Then a flat toothed disc to allow the screw to inset a millimeter or two.
[attachment 47339 image.jpg]

The switches for the top of the slides needed to be offset a bit, so I use the included split lock washers but not used in the build manual to let the switches stick out without catching.
[attachment 47340 image.jpg]

The power supply mounts were off by so much that I had to mount them at an angle to get them to work. Already reamed the holes for the M3x8s so didn't want to have to drill new holes. I put the frame on its side so I could work out attaching the power supply more easily.
[attachment 47341 image.jpg]

Standing up, the corners luckily are not lower than the frame or could make a pivot point if there is any vibrations.
[attachment 47342 image.jpg]

Drilling in acrylic can be a pain and chip or crack the part if the bit catches too much.

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rtideas
Trying to use what came with the kit. Was missing the 30mm tensioner bolts listed in the Build Manual. After searching my local hardware store (limited metric), Lowe's (too short), my favorite hobby shop, another hardware store recommended by the hobby shop (same selection as Lowe's), I found the bolts at another hobby shop across town.

They manual should recommend 35mm or longer. Also, the nylock nuts spun freely. My guess, the plastic parts scaled up for the 20x20 frame also scaled the nut holes. Had to jam a small flathead screwdriver to tighten the tensioner bolts.

I also attached a coax cable mount I took from my basement to attach the power cord to the frame to keep tension off the power supply connections.
[attachment 47400 image.jpg]

Yeah, Dnguyenai598, I wonder about the hot bed on an acrylic mount. Did it even warp with the spacers?

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parco

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bjoernkarmann
Hello Reprappers

I got my FolgerTech Kossel 2020 a week ago, and the build went good. After some research i found the firmware, for Repetier Host (windows) 0.91.

My problem is that a the firmware seems "right", but the distance it travels when using manuel control is, way bigger in the Repetier program, whene going home, it looks more like a crash!
I run with 36 teeth pulley, GT2, 44,44 mm/step, the motors are 1.8 degree NEMA 17. (when traveling z up, at 0.1 it jumps over a step every second time)

I dont know which setting i should change, to configure the motors? Any information or if anybody has the same problem?

Thanks!

I have this exact same issue, did someone mention going to 20 tooth pulleys can fix this?

EDIT: Can confirm, switching to 20 tooth pulleys and changing the DEFAULT_AXIS_STEPS_PER_UNIT in firmware does fix this problem.

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bjoernkarmann
Thanks!, maybe i will just go for the 20 or 16 let me know how it goes with your 16-tooth and if you changed the steps pr mm perhaps.

And for rtideas, i have the same problem with the acrylic (i also had a "home button holder" cracking, and had to mount the power supply sideways. so you defiantly have de be carefull with the screws. even my bed holder did't fit .

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rtideas
Closer. At least it's moving. Installed 0.91 Repetier firmware. I matched all the settings to the configuration file in the FolgerTech Google Drive except for rod length and my added LCD screen.
Googe Drive--FolgerTech Kossel 2020 software package.zip.

The printer moves, but 0.1 mm steps are giant at 6 mm. 1mm are 60 mm. 10 mm are 600 -- I don't dare.

Using the 36 tooth pulleys. Also, the stepper motors get considerably hot.

Attached is my config file.

1. Did I miss something?
2. How hot are steppers when on?
3. Should I try switching to Marlin?

My steps: I used an online configurator for Repetier. Used the Arduino SDK to install. Used Repetier-Host on my Mac to connect. Tried micro 0.1 mm steps to test it. Instead, it moves at at 60x the distance.

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bjoernkarmann
Thanks!, maybe i will just go for the 20 or 16 let me know how it goes with your 16-tooth and if you changed the steps pr mm perhaps.

And for rtideas, i have the same problem with the acrylic (i also had a "home button holder" cracking, and had to mount the power supply sideways. so you defiantly have de be carefull with the screws. even my bed holder did't fit .

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rtideas
Closer. At least it's moving. Installed 0.91 Repetier firmware. I matched all the settings to the configuration file in the FolgerTech Google Drive except for rod length and my added LCD screen.
Googe Drive--FolgerTech Kossel 2020 software package.zip.

The printer moves, but 0.1 mm steps are giant at 6 mm. 1mm are 60 mm. 10 mm are 600 -- I don't dare.

Using the 36 tooth pulleys. Also, the stepper motors get considerably hot.

Attached is my config file.

1. Did I miss something?
2. How hot are steppers when on?
3. Should I try switching to Marlin?

My steps: I used an online configurator for Repetier. Used the Arduino SDK to install. Used Repetier-Host on my Mac to connect. Tried micro 0.1 mm steps to test it. Instead, it moves at at 60x the distance.

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dougal1957
You do have the 3 jumper fitted underneath all the Stepper driver modules don't you?

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< 5:50:15 AM: EPR:3 11 2560.0000 Steps per mm

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rtideas
Sent a M205 command and got:

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< 5:50:15 AM: EPR:3 11 2560.0000 Steps per mm

Far greater than then the 44.44 mm I did set it to with the Arduino SDK.

Need to dig to see where tis is getting changed.

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rtideas
Awesome Doug! Thanks!

Was just about to switch to Marlin.

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dougal1957
Glad to help.

I couldn't get marlin to even compile for me hence I went to Repetier which to be honest I prefer anyway now though next printer will be a 32 bit controller as it will be a semi large delta (400mm dia bed with 1000mm towers) should give me about 550 mm build height at 350mm diameter or so

just need to print all the parts for it now.
Doug

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rtideas

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dougal1957
Glad to help.

I couldn't get marlin to even compile for me hence I went to Repetier which to be honest I prefer anyway now though next printer will be a 32 bit controller as it will be a semi large delta (400mm dia bed with 1000mm towers) should give me about 550 mm build height at 350mm diameter or so

just need to print all the parts for it now.
Doug

Good to know. I like the idea of larger deltas.

Care to share your Repetier config file?

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rtideas

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dougal1957
You do have the 3 jumper fitted underneath all the Stepper driver modules don't you?

Yes. All jumpers in place and configuration set to 44.44 mm/step. Are you allowed to use floating point values?

Another issue is my top endstop switches work in reverse. They stop the slide from moving down, not up.

The Build Manual suggested soldering connectors for the thermistors and auto leveler switch. Had solder seep down a bit too far so the connectors would not seat all the way down. Had to desolder two. Crimping, if done properly, should be fine.

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dnguyenai598
Endstop in reverse? You are off by one at the header; there are six inputs into that header, every other three are minimum endstops and every other three are maximum endstops, you want the maximum endstops. There should be a pic in the doc.

#define INVERT_X_DIR 1
#define INVERT_Y_DIR 1
#define INVERT_Z_DIR 1

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rtideas

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dnguyenai598
Endstop in reverse? You are off by one at the header; there are six inputs into that header, every other three are minimum endstops and every other three are maximum endstops, you want the maximum endstops. There should be a pic in the doc.

It was these settings I had to set to 1 and now my endstops work properly:

#define INVERT_X_DIR 1
#define INVERT_Y_DIR 1
#define INVERT_Z_DIR 1

Finally going in the right direction, err, stopping in the right direction.

Anyone actually get the hotbed to not warp over the acrylic? Should just scrap using it from the start?

Also, best to start with PLA, then move to ABS? I also have some T-Glase to eventually play with.

Thanks everyone for your posts, help and suggestions.