Hello friends I am thinking about this problem. Currently the galvo on the market is very expensive and its control and alignment is quite complicated. I found the Marlin open source 3D printer can integrate and write more code to take advantage of stepper motors to replace galvo for Resin printing. Replacement for SLA printers that are using galvo today. I am having an idea to develop stepper motor as galvo to move the laser I am also having difficulty in writing structural code to control this stepper motor in Marlin system can someone suggest me the problem? Or someone can help me, I can pay the person who can implement this idea https://reprap.org/forum/read.php?13,885889,885889#msg-885889 Mon, 18 May 2026 20:26:35 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,885889,885904#msg-885904 https://reprap.org/forum/read.php?13,885889,885904#msg-885904 Girl Controllers Thu, 02 Sep 2021 00:09:47 -0400 https://reprap.org/forum/read.php?13,885889,885894#msg-885894 https://reprap.org/forum/read.php?13,885889,885894#msg-885894
For "exact" positining you have to calculate/compensate the "cushion distortion" of the mirrors, what's depending on your special setup ... this can be measured and adjusted with a linear equation ...]]> VDX Controllers Wed, 01 Sep 2021 09:22:28 -0400 https://reprap.org/forum/read.php?13,885889,885893#msg-885893 https://reprap.org/forum/read.php?13,885889,885893#msg-885893 Girl Controllers Wed, 01 Sep 2021 08:45:38 -0400 https://reprap.org/forum/read.php?13,885889,885892#msg-885892 https://reprap.org/forum/read.php?13,885889,885892#msg-885892
All the "adjustment" was made with an external software, which konverted the XY-koordinates to G-moves, adjusted for the nonlinearity of the galvos (cushion distortion) and for the F-value, which defines, how many extruder-steps per mm, what was 1:1 sent to the laser-controller to pulse the laser ...]]> VDX Controllers Wed, 01 Sep 2021 08:43:30 -0400 https://reprap.org/forum/read.php?13,885889,885891#msg-885891 https://reprap.org/forum/read.php?13,885889,885891#msg-885891 Girl Controllers Wed, 01 Sep 2021 08:34:24 -0400 https://reprap.org/forum/read.php?13,885889,885890#msg-885890 https://reprap.org/forum/read.php?13,885889,885890#msg-885890
I've built something similar with servos with super-high gearing (400:1 and 800:1) and corresponding encoders on the motor shaft - here a related thread in the German forum:
[reprap.org]

The servo-drivers were controlled by STEP+DIR, as common steppers, so not this different (the drivers made the closed-loop on their own) - and even with this high gearing they were capable of speeds up to 1m/s ... so even faster with lower gearing ...]]> VDX Controllers Wed, 01 Sep 2021 07:57:44 -0400 https://reprap.org/forum/read.php?13,885889,885889#msg-885889 https://reprap.org/forum/read.php?13,885889,885889#msg-885889 I am thinking about this problem. Currently the galvo on the market is very expensive and its control and alignment is quite complicated. I found the Marlin open source 3D printer can integrate and write more code to take advantage of stepper motors to replace galvo for Resin printing. Replacement for SLA printers that are using galvo today.
I am having an idea to develop stepper motor as galvo to move the laser
I am also having difficulty in writing structural code to control this stepper motor in Marlin system can someone suggest me the problem? Or someone can help me, I can pay the person who can implement this idea]]> Girl Controllers Wed, 01 Sep 2021 07:22:40 -0400