# Adjusting the galvos for better accuracy; success! **URL:** \ **Category:** Projects & Prints\ **Created:** [January 23, 2014, 5:54pm UTC](https://forum.formlabs.com/t/adjusting-the-galvos-for-better-accuracy-success/810 "2014-01-23T17:54:52Z")\ **Posts on this page:** 1\ **Showing post:** 8
**Author:** ![KevinHolmes](https://avatars.discourse-cdn.com/v4/letter/k/3ec8ea/32.png) [@KevinHolmes](https://forum.formlabs.com/u/KevinHolmes)\ **Post date:** [January 27, 2014, 10:44pm UTC](https://forum.formlabs.com/t/adjusting-the-galvos-for-better-accuracy-success/810/8 "2014-01-27T22:44:28Z")
I wondered that exact same thing Shane:) I even ordered some photopaper from Amazon, but then couldn’t wait and just got stuck in. I did worry a little about measuring the results though - since gripping a solid piece with the verniers is easier to measure than lines on paper. I also wondered about getting a laser cut mask with 0.2mm lines 120mm apart and using modified laser\_spot\_test.form files in conjunction with photodiodes hooked up to a voltmeter to measure when the laser spot was brightest through the mask. But the laser spot test file seems to slow the galvos down universally - both when the laser is on and when it’s off - so it takes 18 minutes plus for the laser spot to appear at the side of the build platform as the galvo slowly tracks across from the middle. Which was only a little faster than printing the calibration pieces, plus the effort of getting the mask cut and wiring the diodes. I did buy the photodiodes though - oh well, they’re on the shelf with the photo-paper 🙂 --- _[View the full topic](https://forum.formlabs.com/t/adjusting-the-galvos-for-better-accuracy-success/810)._