Here’s my brackets going to solve the oscillations problem of the frame in the Prusa i3. Print quality is dramatically improved and I’ve also 6cm more on vertical print (Z axis).
Publish stl files on Thingiverse shortly.
There’s no reason to do this. In fact, by doing this you may actually be reducing your print quality. Allowing those screws to float free means they aren’t attempting to overpower the linear rod, which should be what positions the X gantry and controls movement. In your case, you’re probably lucky because you’re using a much thinner allthread than what was used in the past, so it’s likely that it’s just going to be overpowered.
The screw wobbling is not a problem. They hang free for a very specific reason.
In fact, the print quality problems you have are MORE likely caused by the types of couplers you’re using to pair the Z axis stepper motors to the allthread. They’re springy in the Z axis which can cause sideways binding as the X carriage moves back and forth and cause dynamic loads as your Z moves up.
the best improvement in this case is to have a hook on the top of the frame that avoid vibrazions
Pasquale. This is very interesting. I like the idea, very clean and neat, the printer looks great as well but I was wondering if you took any measurements of vibrations before and after installing the new brackets? Sorry for asking all this questions but I am really interested if they actually made any quantifiable improvement! Thank you for your time
Thantik. Do you own a Prusa i3, and if you do, did you had any problems with vibrations? As I said earlier I build an i3 for my 3rd year project and I am very interested in finding out how to overcome these glitches. Could you please let me know of any other improvements that you have made? Thank you.
@ioan_dascalescu , I used to own an i3, I’ve since moved onto building an Ingentis/Eustathios. @Mike_Smith owns what was left of my i3, but even now I think most of it is gone converted into a box laser cut frame.
I never had any vibrational issues. I used 10mm threaded rod on the bottom, with a set of progressively larger stacked washers on each side of the frame to ensure rigidity.
I didn’t use any cross braces. I didn’t use any stabilizers. But I also had a bowden system which was very lightweight so I didn’t have any vibrational issues either.
Most people I’ve seen with issues are people with that heavy motor mounted directly on the X axis. I found that a bowden system basically gave me an extra 15-30mm worth of X travel so I went with that.
Hi all!
To answer your questions briefly :
- I printed some pieces before and after , I’ll show you the pictures soon. The difference is clearly visible as a more aligned layers
- I own a Prusa i3 , and I saw that the problem of the vibrations manifests at high speeds ( > 70 mm/s)
- Other improvements are having mounted a plate larger print on Y ( 340mm), thus changing the structure of the base and the endstop switches. I replaced the pulleys X/Y with those in aluminum .
Finally I installed an auxiliary support on the back of the stepper that moves the Y-axis to prevent the belt tightly, pull the engine causing it to twist and loose belt/precision.
Thank you so much for your help guys, I really appreciate it. It will be a while before I implement these improvements but I’ll keep you posted. Thanks again.
Good proposal. Congratulations
Do you use the switch to turn off the machine at the end of printing?
yes, to avoid accumulating dust in the fans 