Anet A6/A8 Y Belt Holder Upgrade

by Area51, published

Anet A6/A8 Y Belt Holder Upgrade by Area51 May 27, 2017
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Assembling the Anet A6 3D printer kit, I found that the Y Belt mounting was way to high for consistent belt tension. The belts included with the kit are thicker than standard GT-2 belts and more inflexible - I decided to replace them with standard RepRap GT-2 belts (eBay).

The model is Prusa Style and comes in two flavors, one for the kit belt and one for the thin RepRap belt (Thin in name).

I replaced the screws with 2x M4 10mm and 2x M4 25mm.

To tighten the belt, lose the motor screws (or pulley), mount the belt loose, press the motor in place and gently re-tighten the motor screws.

>> Don't forget, if you like it, please leave a like or a tip... :)

Update November 12. 2017:
Added A6 version with extended base (+4mm) for printers with greater distance from belt to y-carriage (A6Ext in filname).

Update October 28. 2017:
Added slimmer version for Anet A8 - Postfix A8 in filename.

Update June 13. 2017:
Replaced with version (V2) with less height to give more room for the returning belt under the holder. Alignment is not perfect and belt loops are smaller to make room for the lower profile.

Print Settings

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3 perimeters, 3 top and 2 bottom layers.

Shown model is printed in PETG.

My Anet A6/A8 Upgrades

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Hi, thank you very much!

How can I set each params on Cura? "3 perimeters, 3 top and 2 bottom layers."

Thank you very much, printed perfectly and very usefull!!!

any way to adjust the depth of the mounting hole on the thicker side to allow for the use of the existing mounting screws?

If the countersink for the long screw holes are made deeper, they would enter the belt slot. The best solution is to find two longer screws.
The length of the screws is dependent on the base thickness, if you could use one of the models with lower base, the screws can be reused.

Hi, Which one is for Anet A8 with stock belt?


Anet stock GT2 belts differs in thickness and are unfortunately not standard in size - they tend to be a little ticker than the GT2 belt standard.
For Anet A8 with belts close to standard, use model "Y-Belt-Holder-Thin-GT2_V2_A8_PP".

If the belt on your A8 is to thick to fit that model, I can upload a changed model to allow for a thicker belt.

I changed the belts on my Anet A6 to standard GT2 belts from eBay, as they are much better and more flexible. This is a cheap upgrade I would recommend.

Hi, thanks for the reply. I will change for GT2 and then I print this. Regards

I made few weeks ago Y-Belt-Holder_A6Ext_V2_PP.stl and works excelent with stock belts. Yesterday I made Y-Belt-Holder-Thin-GT2_A6Ext_V2_PP.stl for new GT2 belts and it doesn't fit :(

Gap is too thight even for GT2 belt. So I run GT2 with first version and it seems to work too.

There doesn't seem to be a standard for the GT2 belt thickness or a least it is not followed. The belts I made the thin version for, are very thin and would not lock in the original holder. Great that you could use the original version for your new belts :)

Removed old versions to make it easier to select the right model.

And whichone is now best for A6?

That depends on your timing belt. If you have the one with the kit, use Y-Belt-Holder_V2_PP.stl. For a RepRap standard thin belt, use Y-Belt-Holder-Thin-GT2_V2_PP.stl.

hey i found that even though you said the v2 was supposed to give more room, the holder is rubbing on the frame underneath the printer as well as the belts

I assume your printer is Anet A8?
From your description, I assume that the solution will be to lowering the base of the holder (closer to heatbed) - How much lower should the belt/holder be to level the belt and clear the frame?

Yeah i have an a8. I think maybe 1.5mm or even 2 should allow plenty of room, beause i noticed it was brushing against the frame and slowing it slightly even without the belts on.

Just uploaded a version (Y-Belt-Holder-Thin-GT2_V2_A8_PP.stl) for the A8 that is 2mm lower (closer to headbed).
Let me know if it solves the problem.

For my A8 this is too tight. Despite, that I bougth a GT2 I had to sand a lot to use this.

Thanks! Works perfectly

can i use it on a8?

The frame must be oriented as shown on the photos for the belt to have the correct height.
If you need another height for your A8 printer, please let me know how much higher it needs to be and I will upload a model with that extra height.

Tryed this one but the Belt wont hold very long...
it Starts slipping out of the Holder... mil by mil...
I will change it asap...

Is that the thick or the thin GT2 belt?
I have only personal experience with the thin GT2 standard RepRap belt. If the gap for the thick belt is to wide, I can change the model and upload a new version.

Hi Joakim,

This is a very nice design ! I just printed it and it is rock-solid and almost perfect. The only flaw is that the lower belt touches/scrapes the bottom of the block a little. Is it possible to alter the design and decrease the total height by 2 or 3 mm? Perhaps the internal loops can be raised somewhat to make this possible? (I can see that the entrance of the upper-belt must stay the same as it is perfectly alligned with the stepper-motor and pully, but perhaps the internal loop can be moved up a litttle?)

Thanx for the awsome design,


PS: a used the 'thin' version (as I also have a non-stock belt)

Thank you!

I was aware of the potential problem, but on my A6 there is a tiny room for the belt.
Making the belt locking loops a bit smaller made it possible to lower the profile 1mm and giving the return belt a little more room before rubbing the underside of the holder block.
Please try out the new version V2 and let me know if it solved the problem.

If more room is needed the next step is to put the belt out-of-alignment. I would avoid this if possible.

Another solution is to use 20 teeth GT2 pulleys instead of 16 teeth, but then the firmware has to be recompiled with the change...

Hi Joakim,

Thanx for the adjustment, but that was still very tight. So I took the liberty to create my own remix (see the new pictures of my make) where I moved the loop 2 mm up (without changing the belt-entrance). This gives me enough clearance for the lower-belt. I am happy with the results (although I have to admit it is a bit harder to weave in the belt compared to your design).

I can send you the STLl if you approve it.

Thanx again ! :)


Thanks for the feedback!

We can do more... Version 2 (V2) updated with some compromises - Loops a little smaller than the original, belt alignment 1mm off and the belt locking centers moved up. That gains 3.7mm for thin belt and 2.9mm for thick belt compared to original.
I have changed the recommended 2 perimeters to 3 perimeters to compensate for smaller locking loops.

Thank you for offering STL model, but it is easier for me to change the Inventor model and regenerate new STL models than working with STL directly.

Let me know it the belt clearing goal has been reached :-)

Hi Joakim,

Thanx for the work :)

I think we have enough clearance now. This is a rock-solid design.