Print isn't centered on bed

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lorenolepi
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Print isn't centered on bed

Postby lorenolepi » Sun Jan 14, 2018 10:26 pm

Just got my N2 and I'm noticing that it tends to favor the lower right hand corner where it the home position is. I was trying to do a 11.5 x 11.5 square test to check the level and it ran into the binder clips... yet there is plenty of room at the top and the right of the plate. Is there a way to set an offset or something to get the full 12 inch range of the printer?
Loren
Olepi Labs LLC

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Vicky@Raise3D
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Re: Print isn't centered on bed

Postby Vicky@Raise3D » Mon Jan 15, 2018 4:40 am

The origin point of the system is at left front corner. If you want to print something close to X minimal boundary, you need to move the clips to other position.
The real size of build plate is 332mm*340mm. As you known, the printing size of N series is 305mm*305mm. The distance between left and right nozzle is 25mm. So that the real using space in X distance is 305+25=330mm. The 2mm left is for buffer. And Y direction is 305mm. There has 35mm empty space in Y direction. But due to extruder motor, the nozzle cannot enter those space.
So that we set limit in motion board firmware that both X and Y direction can only reach to 305mm (right nozzle can reach to 330mm.) Which means even you change the global offset in ideaMaker to move the origin point more backward, you nozzle can still reaches to the real 305mm on plate.

By the way, if you want to print something very close to limit size, please do not add Raft or Brim or Skirt. That may cause out of boundary.

Pavel
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Joined: Tue Aug 01, 2017 8:41 pm

Re: Print isn't centered on bed

Postby Pavel » Fri Jan 26, 2018 10:15 pm

the extruder stopped returning to the starting point - left-bottom. Where are these settings?

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UAB_Blazer
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Re: Print isn't centered on bed

Postby UAB_Blazer » Fri Jan 26, 2018 10:18 pm

So I have ran into this same issue. I printed a 12X12 ring and two of the sides are printing off the heated bed by about 0.125". Is there plans to fix this in the software? I understand the two nozzles need space to move but it still shouldn't start printing 0.125" off the left side and 0.125" off the front. Since the right nozzle is about 22mm onto the build plate at the home position shouldn't the left nozzle start at the same place on the build plate?

Jetguy
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Re: Print isn't centered on bed

Postby Jetguy » Mon Jan 29, 2018 1:29 pm

UAB_Blazer wrote: but it still shouldn't start printing 0.125" off the left side and 0.125" off the front. Since the right nozzle is about 22mm onto the build plate at the home position shouldn't the left nozzle start at the same place on the build plate?


Simply put, no.
There is ONLY 305mm of mechanical movement physically possible in the current design. This is easy to prove, home using the control panel and jog 305mm in both XY. #1 you will see the firmware soft limits at 305 and #2 you will see there is NO additional mechanical room anyway.
Again, BOTH nozzles move together maximum 305mm FROM THE LIMIT SWITCH. That in turn, means that it's impossible for the right nozzle to EVER reach the same exact 305mm area the left nozzle can. (305mm minus 25mm nozzle spacing). It means that with no safety distance and without the bed being physically under the location when the homing switch is triggered, that is FURTHER lost printable area from 305mm
Software cannot make up for hard mechanical limits.

What you are complaining about is a common industry problem. This is not limited to Raise 3D but actually many brands advertise a maximum mechanical motion and even then additional bump safety room and variables in limit switch location subtract from that. The final kicker is, most beds are oriented so the homing location is NOT under the nozzle homing location for purging and a little safety when the Z axis homes fast for overshoot from a nozzle crash.

If you want to change this, you can:
Replace the glass with a slightly larger sheet.
Move the current glass slightly left and front in the clips (or maybe use the silicone rubber pad mounting method for a clipless setup).
Drill the Z sub plate and move the current bed front and left so that it IS parked under the nozzle when homed.

What you cannot do is change a software setting or offset or firmware and pull extra mechanical distance from nowhere.

Jetguy
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Location: In a van, down by the river

Re: Print isn't centered on bed

Postby Jetguy » Mon Jan 29, 2018 1:55 pm

Pavel wrote:the extruder stopped returning to the starting point - left-bottom. Where are these settings?


This is NOT a software or firmware setting. This is a mechanical homing switch function of the printer.
Failing to return means it's highly likely your limit switch has been damaged.
Example bent Y axis limit switch
Bent Y switch.jpg


Here is the same replacement switch that is not damaged.
Normal limit switch.png
Normal limit switch.png (221.07 KiB) Viewed 437 times

paulvl
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Re: Print isn't centered on bed

Postby paulvl » Fri Feb 02, 2018 11:09 am

Да, я разобрался. Все исправил. Спасибо

zemlin
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Re: Print isn't centered on bed

Postby zemlin » Fri Feb 02, 2018 6:07 pm

Jetguy wrote:Here is the same replacement switch that is not damaged.

I bought some replacement switches and laid a bead of J-B Weld down the back-side so they won't be bent in a minor mishap.
IMG_0663.jpg

DetroitCW
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Joined: Fri Oct 20, 2017 10:53 pm

Re: Print isn't centered on bed

Postby DetroitCW » Thu Feb 22, 2018 3:13 pm

We had the same problem. These limit switches bend if you look at them funny (They bend VERY easily). Even the power of the motors returning to home can cause enough deflection to move the switch such that it never functions.

There really should be some more resilient means of fastening them to the board other than just the pins bent at 90 degrees.


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