New Rostock Max V2 hot end crashing into x axis tower

[Jefrysuko]

Hi All,

I got this printer assembles a couple weeks ago and I'm having some troubles. With some prints the x axis stops on the initial decent as it is trying to take the hot end to z=0. I've only gotten a couple successful prints out of it. One being the PEEK fan shroud. I have not been able to print the Layer fan at all as it has this problem every time. I am using MaterControl still using the settings as instructed in the user manual.

Here is a video of what is happening. Any help would be appreciated.

[youtube]http://www.youtube.com/watch?v=zmLVJkkF02U[/youtube]

[barry99705]

Hi All,

I got this printer assembles a couple weeks ago and I'm having some troubles. With some prints the x axis stops on the initial decent as it is trying to take the hot end to z=0. I've only gotten a couple successful prints out of it. One being the PEEK fan shroud. I have not been able to print the Layer fan at all as it has this problem every time. I am using MaterControl still using the settings as instructed in the user manual.

Here is a video of what is happening. Any help would be appreciated.

[youtube]http://www.youtube.com/watch?v=zmLVJkkF02U[/youtube]

Remove the s in the https!

[Jefrysuko]

Ahhh, I was wondering why it wasn't embedding!

[mhackney]

Your problem is classic binding. Your carriage is stalling. There are multiple reasons for this and I'd check in this order

1) jogging speed and acceleration too high. Lower these by 50% and test. What are your speeds and accelerations?

2) mechanical binding - X carriage not adjusted properly

3) stepper current too high

4) stepper current too low

[Jefrysuko]

1) jogging speed and acceleration too high. Lower these by 50% and test. What are your speeds and accelerations?

Specifically you are talking about max feedrate and travel acceleration correct?

[mhackney]

Yes.

[Jefrysuko]

ok, lowered max feedrate to 150 and travel acceleration to 1500. No problems on the initial travel to Z=0 like before. Is it safe to leave these settings this way or is it going to be a limitation in the future?

[Holy1]

If it were me I would find what was causing the initial problem. Slowing The speeds down is just masking the underlying problem. Sure, it's nice that that it is working at the moment but it would drive me nuts not knowing the why. It does look like a mechanical/binding problem.

[mhackney]

I agree with Holy1. There is no harm in going slow but try to find the root cause so you can increase your travel speed. Acceleration speed is not much of an issue. Do this:

start to increase travel speed but leave acceleration at the lower value. Do it in steps and creep up on the 300 mm/s in 25 mm/s increments. How high can you go?