I’m new and would like to thank the community for its kind help.
I’m trying to print without raft but can’t find any way to do so in Preform 2.20.
There isn’t any “Raft type” settings or I just can’t find them (see image).
Am I doing something wrong and could someone please point me in the right direction ?
Another question is : how can I modify Preform’s language ? I’d like it to be in english (it’s in french ATM).
To print without a raft in the earlier versions you simply leave the model on the build platform and don’t generate supports. If you need supports and really don’t want a raft then you’ll need to use other software to generate them as part of your model (Formware is good for this).
this sounds strange because I found some Preform 2.20 related documents that are talking about a “On Build Platform” feature to do just that : print without a raft but with supports.
One such document can be found here (see on page 20) : https://bitraf.no/w/images/d/d0/EN-Using_PreForm_2.20_with_Form_1%2B.pdf
But I can’t find this feature/button on my Preform 2.20 release.
Could someone with a Form1+ and Preform 2.20 tell me if they do have this feature/button ?
So I downloaded and installed V2.18.0 instead.
But I still don’t see that “On Build Platform” feature/button.
I’d like to know if other users have this same problem or if they do have this option.
If someone has this option available, could you please tell me wich version you are using ?
If I choose “Form2” as my printer then this feature appears on the “Supports” window.
But it isn’t available if I choose Form1 or Form1+.
Which means that the description found here for V2.18.0 and Form1 / Form1+ isn’t correct : https://support.formlabs.com/s/article/Older-preform-releases?language=fr#2018
And the other link to a pdf document that I posted previously also seems to be wrong when describing this feature for Form1+.
I lost a lot of time at trying to understand why I couldn’t see this feature in my Preform release and I think these false informations should be corrected to avoid others to loose their time at installing and trying several Preform release before they realize this feature isn’t available for Form1 family printers.
I hope it will be corrected…
If I understand correctly you want to print a part directly on the base on a Form 1+ but still have Preform generate a support lattice (without any raft).
I don’t think that’s supported. As you identified, when the Form 1+ is selected as your printer Preform does not show the “On Build Platform” option. Your problem is summed up by this picture:
The different printers have slightly different support generation algorithms and my guess is Formlabs didn’t want to backport the new feature to the older algorithm (or perhaps they didn’t feel confident the smaller footprint of direct-on-base supports would provide enough surface area on the Form 1+ for reliable adhesion).
However, if you’re really intent on doing this, you can exploit a “bug” in older versions of Preform that allows you to swap resin and printer profiles while leaving the existing support structure intact.
When you open a .form file in Preform version 2.13.1 or below, it blindly maintains whatever printer and resin were previously selected. I was able to:
Generate mini-supports in version 2.20 using a Form 2 profile
Save the result as a .form file
Launch Preform 2.13.1 and select a Form 1+ profile
Open the .form file, without regenerating the lattice
Until the “Import Touchpoints” feature was available, the trick above was the only way you could change resins without having to redo all your touchpoints. Starting with version 2.14.0 they introduced the option to maintain the existing touchpoints, and made it so Preform always forces you to regenerate the support structure:
As far as I know there’s no way to generate a Form 1+ tuned lattice with mini-rafts.
The hack I described is worth a shot, but I still expect you’d get more reliable results just printing on traditional rafts (or using different software, such as Formware, to create the supports as part of your STL model).
This is a very detailed and complete answer with a workaround that I’m gonna try and will let you know the result.
As another workaround I was thinking on generating physical supports with Meshmixer and ask Preform to print it “as is” (without raft / supports).