I’ve been trying to make a hook that will snap onto a 5mm wire frame. I found that when I specify an inner diameter of the hook in Fusion 360 and then print it on my Form 3 the inner diameter winds up being a few tenths of a millimeter less than I specified. I’ve mainly used black resin. I find myse…

the only process in manufacturing that results in dimensions on spec is Machining. Casting, printing, forging, stamping, bending and breaking, and rolling all will have some inherent variation from specifications that have to be accounted for in design. for example- I make a lot of bronze figurati…

I thought that FL claimed in a video somewhere that PreForm adjust the sliced model dimensions to allow for shrinkage. Did anybody else see that or am I imagining things?

I believe Sculptingman is correct, and he lists the right reasons. Your expectations are beyond what the technology can deliver. Different resins will give different results, especially over time. I would expect rigid, given its inclusion of glass fibers, would give you the best results and stabil…

It tries- but again- because of all the variables it is impossible for software to accurately compensate for every possible variable. Its not a linear shrinkage percent. For example- lets say you have part that starts at 5mm thick ,and gets steadily thicker to 20mm- like a wedge- with straight si…

Thanks for the helpful replies. Sounds like the machine is functioning as intended. I was able to get a hook design I’m pretty happy with through a few iterations, just wondering if there was some adjustment I could make to get there in one iteration. I’m sure I’ll get the hang of when to add or rem…

@Sculptingman - thanks for that detailed description of the issues involved in 3D design scaling and modeling. At least I’m better prepared now for how to compensate my designs. I tend to print either my own mechanical parts or interesting organic and mechanical parts/assemblies from Thingiverse.…

well, if you were doing design for, say, injection molded parts, there are sources with detailed guidance on most of the materials you could be making your part out of- but in truth- you learn mostly thru practical experience. This is especially so for a novel technology like SLA- where the variab…

Thanks for the insight. I mostly design for the parts to be used as printed, possibly with a bit of post processing, like tapping holes that need to be threaded, and the jobs are almost always short run, say 1 to 10 parts. Final dimensions are sometimes important, especially where the 3D printed p…

Form 3 accuracy

Support & Troubleshooting

jbrownson October 9, 2019, 3:25am 10

I thought I’d link to a discussion on another thread comparing prints w/ the Form 2 and 3 (including some I’ve printed). It seems like the Form 2 is getting much cleaner results on that part. I suspect this may be what I’m experiencing w/ my hooks, etc.

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Communicating Form3 printed part tolerances to customers General Discussion	10	3908	November 22, 2020
Prints are oversized compare to drawing Form 3/3+	4	2398	January 14, 2022
The size of the printed item is smaller than my model data. Form 3/3+	1	1201	February 24, 2021
Form 2 print tolerances - What can I expect... Too much? Support & Troubleshooting	11	6952	April 26, 2017
Formlab 3 precision is worst than FDM Form 3/3+	18	1853	February 9, 2023

Form 3 accuracy

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