Possibility to set a more precise scaling in automaker

[Looserx @looserx]

Hi..

I have the need to produce a quite large part with fairly exact measurements.

The problem i ran into is that ABS shrinks, and that is making my part a little bit smaller than intended . Well, i thought that there is easy fix to the problem. I´ll just add 1,7% to the scale in automaker… But noo.. Automaker does not accept commas.

So. My my request is

- A possibility to set a more precise scaling in automaker

Thanks in advance for your help

/ Alex

 

• This topic was modified 6 months, 3 weeks ago by  Looserx.

[Medusa @medusadelft]

I do not have a robox yet, nor do i have AM installed, but instead of a , can you use . ? So 1.7

Just a thought.

[Looserx @looserx]

Hi..

I have already tried that .. Does not work..

[click @click My Robox is a Green Kickstarter Limited Edition]

I thought someone here in forum said that AutoMaker scales models automatically for ABS. Is there a way for someone to confirm it?

[Don Colley @doncolley]

Only if the object is to big to print

[kevin @kevin]

You can scale down with other software like netfabb or rhino. Netfabb Basic is for free with some function restriction, but it can scale down.

[click @click My Robox is a Green Kickstarter Limited Edition]

I though it was supposed to be scaled up not down.

Also, what ‘big’ means? Bigger than bed so it automatically scales it down or bigger than something and then it scales it up to accommodate ABS tendency to shrink when cooling?

Shame I don’t know how to search these forums to find references to who said it and where/when

[Rob @bespokeproductdesign]

just tried it and its the same on mine. not sure if that’s a bug in the latest AM . . .looks like you’re stuck with 102% for now.

• This reply was modified 6 months, 3 weeks ago by  Rob.

[T. Burns @mr-burns]

Hi,

I wonder that this is necessary to do manually. I thought that Automaker is doing this automatically depending on the EEPROM of the reel.

I thought it detects the ABS reel and automatically changes the size parameters to get a 100% sized object.

But it does not? Why not?

 

[click @click My Robox is a Green Kickstarter Limited Edition]

I have just printed a box for RPi (my design, still has ‘bugs’). First I printed only 5-6 layers and left it cool down. Measured it and instead of having 134 x 77 I’ve got 131.80 x 75.90.

Full print I did with 101% and got 133.60 x 77.09

So I can say that Robox doesn’t automatically scale your models for ABS shrinkage. At least doesn’t do it correctly. Also, now having empirically tested it - 101% seems quite close to the mark. Rest of tolerances (as I have printed supports for screw holes on RPi) seems very, very close/spot on and I am happy finding the number from the first print. (Shame I made a mistake with DC-To-DC converter board screw holes. Entirely my fault.)

[T. Burns @mr-burns]

The philosophy of Robox was send a 3D object to the RObox unit and press print to get it in real.
So for me detecting the reel and it’s material is necessary to fulfill this.

If Robox/Automaker does not compensate the shrinkage automatically means you have always to print twice.
First time to measure the shrinkage of the object and 2nd time to correct this.

I don’t think that is what the Robox team want to provide to us.

May someone from Robox team can tell us if Automaker tries to compensate the shrinkage automatically and if yes why it does not work on some cases as mentioned from some forum members here.

 

[Anonymous]

Could AM automatically calculate the amount of shrinkage? That depends on many factors - how much fill, total weight, shape of object, different cooling rates for thin pieces, etc. Sounds like a lot of work to get that reliable.

I think the generally accepted rates for abs is about 102% (but YMMV). If I was printing something that had to be millimetre perfect, I’d expect to have to print it several times, probably with different parameters.

[Author]

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