Dimensional Accuracy (Sorta?)

Support & Troubleshooting Form 4/4B
1

I hope this is in the right spot :slight_smile:

I’m hoping to get a little insight from the community with an issue I’ve been having on printing a part. Quick background - I’ve been resin printing for a long time and recently got a Form 4 and have had nothing but an awesome with the printer. It’s an absolute beast and I love it.

There is a particular part I’m trying to print with Tough 1500 and I have tried everything I can think of. I have modeled the hole in the part at 12.05mm, however the hole is being printed at 11.85mm consistently. The hole

I can’t figure out what’s going on. The other parts I’ve printed have been perfect and within .01mm. The measuring tool in Preform is also confirming 12.05mm. Also, the other dimensions of the parts are fine, it’s literally just the hole in the middle of the print.

Things I’ve tried:

  • On the plate
  • With supports (Perpendicular to the plate, 45 degrees etc)
  • Reduced initial exposure to reduce elephant foot while on the plate
  • 0.03 layer height
  • 0.05 layer height
  • 0.1 layer height
  • Cup mitigation enabled/disabled
  • In a box
  • with a fox

If anyone has any ideas on what I could possibly try, I would be forever in your debt. It’s driving me nuts! ( Didn’t take a picture of the top hole, but that’s off by ~0.15mm as well

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2

@DasPrintHaus Thank you so much for writing us in the forums.

I would like to try a few other steps to troubleshoot:

If after taking these steps, you are still seeing some issues, please contact us hereby creating a case. We can work through this further with you!

3

@kcasey Thank you for the reply! I did go through the fit tuning process and things are MUCH better. I’m still off by about 0.05mm. Can this be tuned even more or are we at the limits of dimensional accuracy with the form4? If I could get it within 0.02mm, that would be great as we are looking for exact parts. Would turning off AA help?

Thanks!

4

@DasPrintHaus I am glad to hear we are moving in the right direction here. Can you confirm what AA means? I can then tell you if turning that off would help.

I would also like to confirm if you are seeing these inaccuracies before curing after after curing. If after curing, we will want to make sure we are rinsing out the hole with a syringe of solvent and letting that part fully dry before putting it in the cure.

Another good step to try would be adding additional manual supports around the hole. Making sure not to block the hole with a support structure.

5

@KCasey AA is anti-aliasing.

The dimensions I’m checking are before curing, but after washing and they are squeaky clean :slight_smile:

Can I play around with the fit tuning settings? or does it have to be intervals of 10,20 etc as noted on the fit tuning test print. The documentation indicated the tune should be at +20, but I feel like +23 or +24 would be about perfect.

6

@DasPrintHaus Thank you for that information!

You can test out the fit tuning settings. You will want to follow these instructions to edit the results without having to run another test:

To edit a previously-applied Fit Tuning measurement:

  1. Tap Settings > Tools > Calibration > Fit Tuning. A list of stored Fit Tuning settings appears.

  2. Tap the setting you want to edit. A confirmation screen appears.

  3. If the stored setting is incorrect and you need to run a new Fit Tuning test, tap Reset. The printer resets the stored value.

  4. Run and evaluate the Fit Tuning test as normal.

  5. If you need to update the stored Fit Tuning setting without running a new test, tap Edit, then input and save the new value.