K8200 3Drag Gear Cover

by TomasKruger, published

K8200 3Drag Gear Cover by TomasKruger Jan 2, 2014


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The extruder gears of the K8200 / 3Drag requires lubrication, which unfortunately causes debris to fall down on to the printing plate.
This gear cover is intended to keep things cleaner.


  • On request, I've added a lid.
  • After about 270 downloads I had to republish the "fixed" files as their thumbnails somehow disappeared. They are of the same date and version as before.

Slic3r reported the initial files as manifold, and I printed them without any problems.
The files marked as fixed have been run through Netfabb, as there were reports of the initial files being non manifold.
I have not printed the "fixed" files myself.


Note: These parts need to be scaled to 1/10. (It's a Sketchup design, and Sketchup doesn't work well with small geometries.)
Update: For the lid, please read a bit further down.

This is a two part design, of which the mount is universal.
One M3 hole on the mount will need to be cleared with a 3 mm drill. (This design makes it easier to print.)

There should be enough wiggle room to allow adjustment of the assembly to fit any mounting angle of the stepper motor. Please let me know if you disagree.

Make sure that your printer is calibrated. Otherwise the nuts may not fit into their holes.

Apart from the plastics you will need:
1 screw M3 x 10 with a rather low profile head. To attach the mount to the stepper.
2 M3 nuts. To put inside the mount before attaching it to the stepper motor.)
2 screws M3 x 12 To attach the cover to the mount. (Update: M3 x 10 will not work well. Sorry.)

The added lid is a tight fit. It will fit with a well calibrated printer, but you might need to use a sand paper on rough edges to make it pop in nicely.
The small locking ridge on the upper side is intentionally oversized. It fits, but locks the lid firmly in place. Please adjust at will.
The lid will stay in place even completely without this small locking ridge .
If your printer settings are a bit too generous with the perimeters, you could try to down scale the lid very slightly to fit. Only down scale X and Y, (with the lid lying on the bed). Leave Z unscaled, or possibly very slightly up scaled.

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Welcome to the world of 3d printing forbesbrb! :)
This design is made in Sketchup, and as Sketchup has some difficulties with small geometries, I've scaled the parts by a factor 10.
This means that you have to scale the parts with a factor 0.1 or 1/10th, before slicing.
I assume that you are using Repetier?
In that case, load an stl-file, click on the symbol that show one dark grey triangle in front of a brighter grey triangle, enter 0.1 for X, Y and Z, (they are usually ganged), click the center object icon, (the crosshair), and slice.

You can find further instructions under, well, "Instruction".
Best of luck!

hi there i am new to 3d printing and when i downloaded the files they where away outside the print area it is like the files where massive can you advise what is wrong please

Very nice cover and lid. The snap in function for the lid is great!

Thanks, and what a happy colour you picked! :)

Ce mec est un génie

Hello TomasKruger,

Great design, thank you.
The problem is that Thingiverse has a bug where as when I download the file it is too large to print with my k8200.
Can you please upload the stl file on a link that we can download directly?

Thank you.

Hi, and thanks Pumpkinspice,

First, just to make sure. Should you mean that the print is physically too large to fit within the printable boundaries, it has to be down scaled to 10%. (If you're unfamiliar with Slic3r, just type 0.1 in the Scale box, and click the "Center object button".)

If you do experience some kind of Thingiverse download bug, please let them know.
In the mean time, use these links:

You're most Welcome!
I'm glad that you like them. :)

Hello Thomas,

in the meantime i "repaired" the file by netfabb, too.

In the slicer i set the x/y/z-scaling to 0.1 (i estimated this factor) and i printed and mounted the parts.

I lubricated the gears with ordinary machine-oil, i think it's (for me) ok, too.

Now the printer is running and i will have a look to your parts.

But let me say, the geometric of the parts and the good mounting on the servo is great.

Thank you very much for this parts.

Hi Samurai!
I have just updated the instruction with the need for scaling to 1/10.
Slic3r reported the files as manifold, and they printed well.
But as you've had some problems, I ran the mounting block through netfab and added it to the list of files.

I use lithium grease for lubrication, but are considering using something with a higher viscosity.

Please let me know if your problems persist.

Hello Thomas,

could it be that the parts are not correct scaled? Which scale-factor i have to use?

Further could it be that the mounting block is not "mannig fold" or is having faults in the facetes/facetes-intersections?

Can you give me here good files for my K8200/to print on my K8200?

What do you use to lubricate the gears? Oil? Grease?

Thank you for the good idea and good items.