you've tried just about every permutation of cpu (lpc17xx / STM32 / esp32 / mega / DUE) and firmware (grbl / smoothie). This is my various 32bit firmware ports of grbl, smoothie, stm32, ESP32 that can be used on a laser.So. The 32bit controllers (lpc1769 for smoothie/grbl and STM32 for grbl) will run raster 3-4x faster. They work fine for vector cutting but as you noticed, rasters can be slow. Although you could change the xtal to 20mhz and recompile for the higher speed. The arduino UNO or Mega2560 both run at 16mhz so same raster speed. It is compatible with the RAMPS boards already. That said, the Mega2560 may work for you and only costs a few dollars. For now the 'official' versions are 328p and mega 2560. The main programmer for Grbl is working on an ARM port with a HAL so that porting to any ARM platform should be much easier. As I understand it, the laser mode has many features and can be read about here: Īs for using on the DUE, I'm sure there are ports, but who knows how up to date they are, or if maintained at all. I occasionally see posts about laser topics and most are configuration questions, not problems with how laser mode works. There is a large laser user base and many of the things implemented are laser specific. These 2 repositories are kept up to date. One is for the Uno (328p) type platforms and the other is for the Mega 2560 platform.

Grbl in general is stable and rock solid and has 2 current repositories that are kept up to date. I have been thinking about trying laser out on my mill. K40 Whisperer is a free open source program released under the GNU General Public License (GPL).First I'll say I'm not a laser guy but am a Grbl user on milling machine and am active on the Grbl github site. K40 Whisperer does not require a USB key (dongle) to function. K40 Whisperer reads SVG and DXF files interprets the data and sends commands to the K40 controller to move the laser head and control the laser accordingly. K40 Whisperer is an alternative to the the Laser Draw (LaserDRW) program that comes with the cheap Chinese laser cutters available on E-Bay and Amazon. K40 Whisperer: Control software for the stock K40 Laser controller with M2nano controller board

Cohesion3d laserboard