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Anet A8 Hold Down Bracket

by freemark, published

Anet A8 Hold Down Bracket by freemark Jul 22, 2016

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Summary

These are mounting bracket for Anet A8 and A6 printers. Their purpose is to hold down and stabilize the printer base so it doesn't flex while printing or come out of alignment when moved.

Print four brackets, one to hold down each end of the threaded rods as shown in photo. IMPORTANT: To work correctly the brackets need to hold the printer tightly to the mounting surface, so be sure to put a small piece of duct tape on the inside of the bracket to provide a tighter grip against the threaded rods and prevent slipping.

For best results the printer should be mounted to a rigid stable surface. A sheet of 3/4 inch or 19mm particle board, mdf or plywood should work well. Be sure to use a good quality material, especially for plywood, so it doesn't warp. If you don't need portability you can mount it directly to a sturdy table or work bench. Three files are included:

hold_down_bracket.stl - This is the original version and is designed to fit the Anet A8. I've had the same set of these on an A8 printer for two years now and they're still going strong.

hold_down_bracket_a6.stl - DO NOT USE. This is the first version for the A6, it was designed based on comments and feedback, and is for historical purposes only. Use the updated version 2 for the A6.

Hold Down Bracket A6 -v2.stl - Updated version 2 for the A6. This one is modified from the original, based on comments and feedback. Note that I do not have an A6 to test this, so please let me know how it works.

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Does this does a notable effect on the prints? i just printed them and started my first print with them.
I'm i going to notice anything ?

It depends on your print. If you're printing something tall, with a lot of detail, and/or higher speeds, you should definitely see a difference. On an easy print it may not be noticeable. The other advantages are that you can move the printer without throwing it out of alignment, and you will not need to level the bed as often.

Thanks you! I just finished building my A8. this is the very first thing it is printing right now. To my big surprise it seems to be working and turning out usuable!

What is the best infill%?

I would go with at least 25%

Unfortunately these interfere with the A6 bearing blocks on my machines.

Knock off 2mm or so to clear.

Thanks for the feedback, but could you be more specific about which dimension needs to be reduced by 2mm?

At the very top of the strap it hits the bearing blocks. The A6 has the smooth rod directly over the threaded rod. If you cut the top of the strap down 2mm it might be enough. I like the design.

I printed out the A6 version and they interfered with the bearing blocks. Also - Is the point of these brackets to stop shifting from left to right? I noticed that they allowed for movement up and down.. Not as if the printer should be moving up and down but I'd like to see these fit snug all around. However - thank you for sharing your design !!

The point is to mount the printer to a rigid surface so the frame does not move at all. The A6 version is based on other peoples' comments since I do not have an A6 to test it. Can you measure the distance from the surface to the top of the threaded rods? And also the distance between the threaded and smooth rod above it?

So the threaded rod measures 7.4 mm thick. From surface to bottom of the threaded rod is 20mm. The distance between the threaded rod and hotbed linear bearings is 8mm.

Ok, I uploaded a modified version. Thanks

Had them mounted for almost 8 months, but they started breaking.
Printed at 35% infill in PLA, sliced using Cura.

Very good upgrade, I mounted to a rather heavy wooden board. 18 mm. Beneath this board I did mount rubber AV mounts. Now all the vibrations stays in the printer. This result in a better printing. The rubber mounts are normal standard buffers, diameter 25 mm, height 18 mm, with M6 bolt at one side. Perfect.

Best upgrade yet, thanks for posting this.
I mounted my printer to a piece of 3/4" particle board I had in my workshop and the printer runs nearly silent and the quality of the prints is amazing.

Bracket for Anet A6 should be 1mm lower, than it will be perfect.

Thanks, I'll upload a modified version.

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