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Extruder hits the bed's metal clip

Posted: Tue Jul 12, 2016 5:31 pm
by Mecha_Monster
Hello,

I run into an important issue that I hope can be easily solved. Yesterday I cancelled a print (It was printing the second layer), the extruder moved straight to the home position, coincidentally the extruder was positioned in the very front part of the plate, therefore bumped with the metal clip that holds the glass to the plate. The extruder broke the metal clip and stooped. That incident scared me a lot, because of a possible damage to the machine, gladly it seems to be ok, I only had to replace the clip. Rapidly moving the extruder without first moving down the plate seams to be the incorrect order to bring the printer to a halt. Would it be possible to modify this function and first bring down the plate and then home the extruder?

Thank you,

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 12:16 am
by Michael
I had the same thing happen and it also pushed the door open...with the print bed. We really need the plate to drop at least 10-15mm on going to home position

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 2:24 am
by Phife
I agree, Ive had this happen to me a couple times now. Mostly knocking off my left side clip. Ive since removed the clip from the left side so It doesnt get hit, But the Stop command should really drop the bed some before moving home.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 2:40 am
by Vicky@Raise3D
We are so sorry that the printer cannot know the current position. So that function may not the perfect idea. If it has already reached 205 (N1) or 305 (N2) or 610 (N2P), move the print bed down first will damage the printer.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 4:00 am
by dhylands
It only needs to move down to say 15mm if the current Z position is less than 15mm. There is no need to move if the Z is already lower than that (since it's imposible for the head to hit the clips if the Z is already low.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 4:59 am
by Vicky@Raise3D
But we do not know whether the current Z position is less than 15mm or more than 15mm.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 5:10 am
by dhylands
But the LCD knows the percentage of the height that's been printed so far (and it knows that's somehow different from the percentage of the file), so it must have some idea where it is.

And you could always add a custom G/M command which means go to at least Z15 and have the motion controller do the move, since it knows exactly where it is.

Or use M114 to get the current position, and if Z < 15 then issue G1 Z15

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 13, 2016 6:21 am
by Vicky@Raise3D
Got your point. The current percentage cannot transfer to real height. It is only an estimated value from printing time. But we will take a look to find a better.

Would you like to advise only need it to when stop or also some other where?

Re: Extruder hits the bed's metal clip

Posted: Thu Jul 14, 2016 11:38 pm
by Matthew Lozano
Another solution is to not use the clips at all. instead use thermal pads to stick the glass down to the metal heated plate, this will do away with the risk of collision and also the glass will not be forced to bend to the imperfect metal plate and the glass will remain flatter.

This is what I use, it's been working great.
https://www.amazon.com/gp/product/B007PPEW52/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Re: Extruder hits the bed's metal clip

Posted: Sat Jul 16, 2016 6:09 am
by lylewaters
I had to remove one of the clips because the nozzle banged into it and forced it off anyways. I can't remember if any of the documentation showed us where exactly was the best location for the removable clips (i.e. not the 2 clips at the back), but I think I am only using 1 or 2 along the sides. The front has nothing. There seemed to be extra clips included, but I didn't use all of them. I know that at one point I removed all the extra clips and tried to use the printer with only the 2 rear clips, but that was a bad idea also since something happened and the entire plate shifted a little bit.

Re: Extruder hits the bed's metal clip

Posted: Sat Jul 16, 2016 6:47 pm
by biaggiboy
Matthew Lozano wrote:Another solution is to not use the clips at all. instead use thermal pads to stick the glass down to the metal heated plate, this will do away with the risk of collision and also the glass will not be forced to bend to the imperfect metal plate and the glass will remain flatter.

This is what I use, it's been working great.
https://www.amazon.com/gp/product/B007PPEW52/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Could we see some pics? And does the adhesive come off fairly easily

Re: Extruder hits the bed's metal clip

Posted: Sat Jul 16, 2016 7:32 pm
by Matthew Lozano
biaggiboy wrote:Could we see some pics? And does the adhesive come off fairly easily


This is before adding the glass, It's not as quick to remove as with the clips so may not want to remove the plate after every print like you could with the clips but it still can be removed if you need to.
20160229_210859.jpg


The pads do not have any adhesive its just a really soft and smooth rubbery surface that sticks well to smooth and clean surfaces.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 20, 2016 2:34 am
by Michael
Knocked the clips off 3 times today, stopping test prints. Seriously Vicky, it needs to at least drop 10mm when stopping... You know my 4 year old Replicator2s drops the build plate.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 20, 2016 3:12 am
by Vicky@Raise3D
Notes taken. Will take it into consideration.

Re: Extruder hits the bed's metal clip

Posted: Wed Jul 20, 2016 6:57 pm
by Zettlinger
Consider where you print and place the clip . i often change the clips location if i print at the front right so it can not hit the clip
(i only use 1 clip, seems enough to hold the glass)

Re: Extruder hits the bed's metal clip

Posted: Thu Jul 21, 2016 7:48 am
by Vicky@Raise3D
In my opinion, 1 is not enough. You need to hold at least three sides of the build plate.