belt attachment part for Anet A8

by Simhopp, published

belt attachment part for Anet A8 by Simhopp Mar 21, 2016
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NOTICE !!! manufacturer has changed design of the carriage,
y-axis part will not fit on newer models.

belt attachment for Anet 3D "Anet A8" model Prusa i3 3D printer aka "Omni" aka "m-505".
Acrylic framed printers with 5 button next to LCD screen.

SketchUp model,

Alunar, Hesine may be the same kind of printers.

04/11/2016 - all normals unified and errand edges deleted.
04/15/2016- reduced number of teeth, seemed to be overkill.

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There are to versions for each one, which one works better for you? Is there a version for the late 2017 Anet A8, i mean the y One.

What screws are recommend for this? I have the newer A8 but have printed the E3D carriage which supports the belt holder

are you still using this? what screws or what you using now

I used 2 m3 30mm screws and two m3 nuts. Could probably get away with 25mm as well.

my x one has been working perfectly for about a week now but just today i printed the x tensioner and put it on but as soon as i started tightening the belt, the attachment part lost grip and now it wont hold the belt tight.

Similiar situation. How'd you go around fixing it?

i used copper conductive tape, my blue tape lost thickness over time

I just put a couple of small strips of blue tape on the back of the belt.

I just fiddled with the tensions until it was tight without slipping. Still haven't gotten around to printing a different one though ahahah

how does the belt stay in place

but if you want, you can put a washer when you place the bolt.

The X axis one worked perfectly, but the Y axis one is 27.5 hole center and my H frame is 20mm hole center... it's too long :-\

someone has created different versions for newer model A8.
search for it.

Looks like PLA is not able to withstand the constant heat heat on the X-Axis and gives its firm grip on the belt. Will attempt shortly a print in ABS or HIPS due to their higher temperatures. To make it a permanent fix I'll just jet an aluminum angle and fit it in, C channels will work as well, but will be overkill for the job.

Which X axis model did you use? The Original looks like it would hold up good because not all the weight is on the teeth.

Look into "made" section I posted a pic of it made it blue PLA which failed over short time. I reprinted same model in ABS and had it go through acetone vapor bath. I held it in there so long that entire thing bulged up in almost all direction ( oops) when it was getting harder still drying after the vapors I jammed the belt into grooves while installing it. Printed 5-8 hours ABS couple of times after that, it still holds up looks like. If that goes I'll install aluminum l brackets and that'll be it.

My only wish on this would be some sort of bracket to hold the belts in place. I had them pulled nice and snug, but not a ridiculous amount, and while controlling the unit remotely to pop a print out of the way, the belt came loose. I'm just glad it didn't happen during the print because that would have sucked.

you can put washers with the screws so that washers will prevent the belt from coming out.

Comments deleted.

Did this work for you? Do you have an A8? Did the holes line up?

Yes it worked just fine, I do have a Anet A8 and holes line up fine

I thought it was missing from ours, too, but looking at the instructions on the SD card the design has changed from the example in the video. The new method is to wrap the belt round a screw and fold it back on itself, cable-tying the toothed faces together.

Anyone have the screw hole measurements for the Anet A8 (from gearbest) of the metal heat bed frame...the Y axis belt only can use 2 screws because 2nd set is too far to fit...also can the original designer design/modify a belt_y_4 for the metal heater frame? (it works with 2 screws, but 4 would be much better)


this may be what you need.

Y belt attachment for Anet A8-B printer
by frol


Printed the beltX3 for my gearbest A8 [Anet A8 derivative] installed like a champ..this REALLY should be the stock holder, makes installing the belt and putting good tension a breeze...just pull with some needle nose pliers and push into the grooves and done!

So simple...such a GREAT upgrade mod for a 3D printer!
Great job!


I have to print those parts for a friend of mine..I don't have this printer..so..I can someone tell me the difference between belt_X and belt_x_3 or belt_x_4?



version 4 is simpler design.

belt threads are stronger than I imagined, so I simplified design.

either one works fine.

version 4 may be little stronger.

thank you so much!


Just what I needed! Million thanks....

Hi, thanks for this.
can you create a modified belt-y-3 with 20 mm of distance instead of 28 for the new hotbed ?

Nice, easy to use, cleaner, If only I found it before mounting my printer it would have saved me 30minutes of my my life mounting the belt with stock attachment. (Yes that's my second 3D printer I could have printed it before assembly :D)

Got the X axis one working, much better than than before. However, the slot for the belts is slightly too big, the belts slip out pretty easily so I had to wedge something under the belt for it to be snug. I would recommend making the slot for the belt about .2 or .4 mm smaller.

I haven't tried the Y- axis one yet, but I don't know if it will fit, since my bolt holes are only 22mm apart. Only one way to find out though!

It was too tight, so I increase it until it was just right.

but I guess it depends on many factors.

I included sketchup files, so it would be easy to adjust.

Might just be the tolerances on my printer, or the thickness of the belt.

it is easy fix with sketchup,

just push/pull the flat wall 0.2mm in, export stl, and make a new print.

same with y axis, select the faces/edges, move few mm.

Witch belt tensioner is working for x axis belt on Anet print ?

these are NOT tensioners.
these are just belt attachment parts, or clips.

for tensioners, follow this link

Belt tensioning modification for Anet A8
by Simhopp

This is the best upgrade to the drive system ever, so simple and sturdy, thanks !

wow, it actually worked?

I designed it, but never printed one out.

therefore unsure whether it would work or not.

I'm still using the originals that came with the printer.

I used the version 2 model, when using this no other adjustable belt tensioners are needed, Thumbs up ! I think this should be standard.
It increases the accuracy of movements a lot.

could you post photos of these things in action? thanks.

also, I would recommend my frame brace for anet printer, if you are thinking of increasing belt tension on y axis.