Deformation


#1

Good morning,
I have a form2.
i have a problem with the deformation of the pieces. When the pieces are just printed, it is ok, I don’t see the deformation; but after 1 hour the pieces begin to deform. (I attach image)
It’s normal?
This pieces I printed it on the platform; it’s correct?
I cure uv this pieces. I printed wiht tough resin.
Thank you and sorry for my English
Bye!


#2

Do you remove piece supports before or after curing with UV?


#3

thank for your answer

remove piece support after curing.

bye


#4

Do you have this problem with all materials or only the Tough resin?

We have had many problems with Tough, so we generally use other resins for all parts we print on our Form 2.


#5

Thank for your answer;

I have this problem with Tough resin and Durable resin, with rigid resin is better, but rigid resin is a good resin, but for me is too much rigid, it is frail.

bye


#6

We find that the automatic supports generated by Preform software is just about sufficient to get the parts printed. We always add additional supports in places we suspect might warp later . Our thinking is that internal stresses are caused in the part during “peel off from Vat” on every layer and during curing.

WE add additional supports to reduces the impact of those two reasons. After generating automatic supports we review the every layer and add additional supports whenever there is unsupported over hand of more tha 2 or 3 mm. ( Layer thickness in our case is 0.1 mm). We also make sure there are enough supports to resist all the degrees of freedom for movement during the peel off process. There are not well defined rules for this. Just gut feel. We normally achieve dimensional accuracies of +/-0.15 mm and geometric precision (parallelity and perpendicularity of about 0.3 to 0.4 mm ) over a dimensions ranging from 20 to 75 mm.

Trying to do anything better than those accuracies have proved very cumbersome for us.