![]() Since RepRapFirmware is purely configured via Gcode in a config file, you don't even have to mess around compiling your own firmware. The WiFi module, together with DuetWebControl, is excellent to use. ![]() Dedicated fan headers will allow you to reduce noise in idle because you can turn the hotend cooling fan off whenever the heater is below a specific temperature. Better Microstepping eliminates salmon skin on prints and will improve accuracy and quality. A recent RepRapFirmware mainboard like the DUET Mini or the Mellow FLY will come with TMC2209 drivers that have proper Microstepping and can work almost silently. Though if you have a machine that's just not working properly due to the electronics and firmware but is mechanically solid, such a conversion might make an old machine perform really nicely again. That doesn't require any firmware configuration is the easiest to implement and objectively the best solution in such a case. My conversion from a proprietary mainboard to the Mellow Fly RRF worked great, and I regret nothing because everything is better, but what can you expect if you're thinking about putting such a new mainboard in one of your machines? Well, first, if you've got a printer that works and you're only looking for WiFi connectivity, just add Octoprint. Preferably my adapter board (soldering iron required)Ī cartridge thermistor (video comments suggest the CETUS uses a PT100 so the stock thermistor might be compatible with the Mellow boards) Prerequisites for the CETUS Mellow FLY conversion Despite the name, they are just as well usable for most other 3D printers. There's an active Discord channel and a Facebook group around the Mellow Fly boards, and the Duet forum is excellent if you're looking for input on firmware configuration. Team Gloomy, responsible for the RepRap firmware port, has a great guide to perform precisely this Ender-3 conversion. The boards are called MELLOW Fly E3 because they're meant as a drop-in replacement for Ender-3s with compatible JST connector sockets and the same hole pattern. They are running powerful STM32 microprocessors for RepRapFirmware, have integrated WiFi with an external antenna, and plenty of IO-ports for fans, thermistors, sensors, and different types of screens. There are two versions of it: the normal E3, which I also used and has replaceable stepper drivers, and the newer E3 Pro version has integrated and five instead of four TMC2209 stepper motor drivers with additional improvements. Simply put, the Mellow FLY RRF seems to be a cheaper version of the popular DUET 3 Mini 5+ because it sells for only around $60. Then follow the procedure on the site to install it on the SD card and set it up.Let's talk about the mainboard I used. Remove the setting from config-override before making changes in config.txtĪs we can no longer control the printer through Wifi, I have chosen to control it with OctoPrint.The setting in the config.txt file is _per_mm. I used the procedure described here to calibrate my extruder. This writes the setting in the config-override file. Store new zero location permanently (M500).Use the controls in either printer control or repetier-host to lower the nozzle so that you can pass a piece of paper between nozzle and bed without the nozzle catching it.Move nozzle to middle of plate at 10mm above zero (G1 X90 Y90 Z10).Open the serial port to communicate directly to the printer and do: I found the nozzle height in Cetus Studio not to be correct when starting to print with the tinyFab CPU, so I followed this procedure to set it correctlyĬonnect the printer through USB to either Simplify 3D printer control or repetier-host. Unmount the drive and restart the printer. ![]() uart0.baud_rate: set this to 250000 for faster communication.gamma_max: set this to the nozzle height in Cetus Studio.The config.txt file needs to be adjusted to your printer. This will upgrade the firmware and start using the config.txt for control of the printer. Restart the printer by powering off and on. You should see a removable drive appear, out the firmware file and config.txt file here. Latest Smoothie firmware (the CPU comes pre-installed with the Smoothieware, but always better to get the latest).It should look something like this: Software setup ![]() Be careful to have the orientation correct. Disconnect printer, open the case, carefully remove existing CPU and put the tinyFab CPU in place. I’ve collected my installation and configuration procedure here Hardware installation These reasons were enough for me to make the jump.
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