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UP Plus 2, platform levelling

Posted: Tue Dec 03, 2013 6:01 pm
by rvalle
The Up 2 comes with automatic calibration sensors that allow newbies to get started quickly. My first print was indeed an out-of-the-box success!

You start however running into trouble when trying to print larger objects.

Experienced users around here consistently point out that fine platform leveling (as opposed to calibration) remains key to achieve good results, and that phisical platform leveling is still required.

When I was about to discard the automatic calibration and level by hand, a post by dhgrimes cought my attention: one can use the automatic calibration as an aid for platform levelling.

It is however not trivial to do it, this is how I did it and has worked great for me.

I did notice that the calibration systen is both consistent (will always return the same metrics for several consecutive measurements) and responsive (a minimal touch on the leveling bolts will change the metrics. So, it should be up to the job.

- Every time you "auto level" your UP will automatically set the values at "platform calibration”.
- The platform calibration show the delta ammong the different 9 points measured. It is not intuitive to workout which adjustment will trigger which value to change, and in which direction.
- It doesn't help also not knowing what is considered good, bad, and what is possible to achieve.

I used the following procedure to level the platform.

- There are three leveling screws, one in the back and two at the front of the platform. One of the front ones will be the "reference", so, don't touch it for now.
- Auto level and collect the metrics in platform levelling screen.
- Select the maximum M and minimum N, for example: 0,5 and 0,1.
- Lets make D=M-N. Consider D a metric that tells you how unlevelled your platform is. Our goal will be making it 0.
- Select one of the screws that is not the reference one.
- Tuning only this screw try to reduce D as much you can. Just 1/10 of turn is enough each time. If D goes up as you auto level/measure, try in the other direction. Repeat the process untill you arrive to the minimum D you can do. In my case D was 0’3 at this point.
- Then go to the other screw (that is not the reference one) and repeat the process.
- You will reach a point in which you have say D=0'2 and touching either screw a little seems to shift all values but the D remains the same.

At this point you can measure how unleveled is your platform in a finer way: auto level and collect the measurements at the 9 points P1..P9, lets say K is the most popular value for P1..P9. Lets make D2=SUM(P1-K … P9-K). In other words, add up all the deltas respect the most popular metric.

- At this point I had something like D2=0,6 for this platform level indicator.

- Again try to reduce D2 with those two screws only by doing really fine turns.
- I did get to D2=0,4 meaning that 5 points have the same value and the the 4 remaining a delta of 0,1. I coud not progress any more.
- As a last step try to reduce this metric by tuning the "reference" screw, the one that we didnt touch during the whole process.

In the end I got 7 points with the same metric: 0, including the 4 corners, and only 2 points with. 0,1 delta. Here it is.
Screen Shot 2013-12-03 at 12.31.04 PM.png
Screen Shot 2013-12-03 at 12.31.04 PM.png (19.07 KiB) Viewed 10583 times
The whole process is time consuming (may be 1 hour) but most of the work is done by the printer. You can browse thingiverse meanwhile without any problem. Just remember the last screw you touched and in which direction.

Just a word of caution, if you touch/losen much one screw and the UP! auto level doesn’t like the metric returned it will return a plain “ERROR!” in windows, and “Check all the connections” in OSX. Fastening all the screws will get you out of this. A message saying “Value out of expected range” would have been much more helpful.

Adjusting the Nozzle height.

I have read some reports that the Nozzle Height Detection is not accurate, but I also noticed that the Height Detection is certainly consistent and responsive to thin thin tuning.

In the worst case scenario, I will have to workout a “delta”, by which adjust the metric each time I need to detect the height but I expect that delta to be always the same.

In my particular case, nozzle hight detection seems to be correct, once I realised that remaining plastic on the nozzle impacted the measurement made.

I can now print larger objects for which before I got the corners lifted of the platform.

Re: UP Plus 2, platform levelling

Posted: Thu Dec 05, 2013 2:00 am
by dhgrimes
A note to all UP Plus 2 owners!
I have had two of two printers lose communication with the computer. The computer does not see that a printer is connected and powered up. They are school printers in different locations and with different computers and each had less than 20 hour of printing. The failure has persisted when the printers were connected to different computers.

The distributor, who supplied the printers, relayed that the manufacturer indicated that ESD (static) probably damaged the CPU's of the printers. In one location the students remembering being "shocked" by static the same day the printer stopped communicating.

Has any one else experienced lose of communication with the printer? UP Plus 2? UP Plus?

Precautions:
1. Disconnect the "Calibration Cable" from the printer when calibration is complete.
2. Do not touch the "plug" portion of the cable connector when inserting or removing them from the printer or the sensors.
3. Do not touch the metal portions of the sensors when the cable is connected to the printer.
4. If you suspect "static" in the environment of the printer, then it may be necessary to employ the same Work Place ESD Controls that are common in the electronics industry.
5. Request recommendations from UP!

Re: UP Plus 2, platform levelling

Posted: Thu Dec 05, 2013 6:05 am
by wackojacko
I also strongly suggest that the PC and printer are powered by the same power and extension block. The cause is most likely coming from the earth differential over the usb. Try having a rubber mat when standing at the printer.

UP Plus 2, platform levelling

Posted: Mon Dec 09, 2013 10:47 am
by rvalle
dhgrimes wrote:A note to all UP Plus 2 owners!

Has any one else experienced lose of communication with the printer? UP Plus 2? UP Plus?
Which message do you get? In windows or OSX?

I get several, the most common is could not link to the printer in OSX, restarting the application and/or reconecting the USB cable fixes it.


Sent from my iPad using Tapatalk

Re: UP Plus 2, platform levelling

Posted: Tue May 13, 2014 10:14 pm
by Yakuza
Ok im gonna try 2 type something in English.Im a dutch (flemish) speaking from Belgium.
i used rvalle info 2 level my platform.
I completed it with Measur default point distance of platform nozzle schedule.
nr 1-8 0.0
nr 9 0.1
next thing a did is a auto nozzle hight.end the first print i made the nozzle hit the prefboard gentley.
A little noise.Second layer ok.
is that normal or is auto mesure crap?
I hope my warping of buildlayer is gone now.
If it stil warps i let you know.
I use ABS from pp3dp,its a new up plus,i preheat for 15 min,original perfboards.
Some tips please 2 end the warping.

Re: UP Plus 2, platform levelling

Posted: Tue May 13, 2014 10:29 pm
by Yakuza
oo man going crazy.
the buildlayer stays on the board but the object im printig is coming loose from the buildlayer.... Warping

Re: UP Plus 2, platform levelling

Posted: Tue Jul 29, 2014 7:21 am
by maya.p
I have Up! Plus. I had 3 yellow coloured perfboards. I now ordered 2 new perfboards last month. I got the black coloured ones. But the black ones have a problem of warping, especially for large objects. This was never the case with the earlier yellow boards.

Any similar incidents? Can anybody tell me where I can get the old ones?

Maya Pundale
BlueStone 3D Labz Pvt Ltd.