F-Theta Scan Lenses


#1

Does anyone know anything about F-Theta Lenses?

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6430

Do you think they would work to prevent barrel distortion? Maybe moai 2.0 or even as an add-on?


Geometric Accuracy
#2

Have a look here:

It’s apparently a harder nut to crack than 3DFacture thought, LOL.


#3

barrel distortion is on both x/y axis while galvo distortion is only on one axis, so a standard F-theta lens is unlikely going to work for laser/galvo setup


#4

when should we expect a software update to fix the galvo distortion? Is the galvo distortion on the y-axis galvo?


#5

You can see the distortion in the video linked below.


#6

I will try this gcode tomorrow. I am still very concerned with the accuracy. Does anyone have a grid of the distortion on the build platform. I was also curious to see when this issue would be solved.


#7

isn’t the distortion 3-dimensional? I feel like it should be like a cone starting from the laser, so the higher from the vat the higher the distortion.


#8

It’s 2 dimensional, the z is consistently accurate.


#9

the distortion is on one axis that is inherent in laser/galvo system. We are working on a firmware fix for this. The distortion is more on the edges and you can manage it but not completely eliminate with advanced calibration.

Advance Moai calibration guide:


#10

Thanks for the link being added for the 16th time, since it seems to be the only response to this issue. Still curious when to expect a actual solution. It seems you have been working on this issue for a couple of months, and seriously workin for about 1 month. Is there is any way the community can help, being a open source printer and all? Would it be a firmware fix or cura fix?


#11

We have been approaching this issue from firmware and standalone program since November. standalone program is much more further along and we hope to have a public beta by April. It is not as simple as it may sound because adjustments are non-linear and gcode is represented by lines which would need to broken into small pieces. As soon as we have some publically testable we will share with the community.


#12

From our testing we were only able to get a 70mmx70mm build area within a 100 micron tolerance. I know it has been mentioned that a 100mmx100mm is consistent. Have you also found similar results Mark?


#13

Peopoly-
6 month have passed since the last post.
Have this issue been solved ?
(hard to follow the issue through so many different topics)


#14

Does anyone tried to use an f-theta lense in the moai? I would be very interested to read about your experience.