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We haven't tracked posts mentioning K40-GRBLcntrlr yet.
Tracking mentions began in Dec 2020.
2 projects | reddit.com/r/esp32 | 22 Jul 2022
Show HN: I built a CNC-machine from scratch, using 40x 3D-printed parts
5 projects | news.ycombinator.com | 3 Nov 2021
I understand you put thought and time into your approach and it was a hobby to learn more abotu the process (and thus you know about MPCNC but decided to make your own). I've also build similar systems and I've learned some timesaving tricks that have paid off in terms of hobbyist enjoyment.
I really like buying the majority of the parts from a place like OPenBuildsPartStore, rahter than assembling frames from channel manually. Time/cost/quality tradeoff is hard to beat here.
I strongly recommend switching to Grbl_Esp32 https://github.com/bdring/Grbl_Esp32 with external controllers (this board https://www.tindie.com/products/33366583/6-pack-universal-cn... with these plugins https://www.tindie.com/products/33366583/external-stepper-mo... and these controllers https://www.amazon.com/STEPPERONLINE-1-0-4-2A-20-50VDC-Micro...). That's what I ended up with because tuning current using the little pots is dumb, and you want a TON of current going to those huge motors. ESP32 + Grbl has a bunch of nice features that aren't in plain old Uno GRBL.
My system has high torque NEMA23 with no gears (same motor for all 3 axes), I can't see any situations where adding more torque to the X or Y axes using a smaller gearer stepper makes sense.
Pen plotters: not just output devices
3 projects | news.ycombinator.com | 5 May 2021
if you want to see how it's done in modern plotters/CNC, Bart Dring's [Grbl_ESP32](https://github.com/bdring/Grbl_Esp32) is fairly easy to follow with good docs. I have one of Bart's plotters, as I don't have space or money for an Axidraw with all my other old plotters around the place.
For actual optimization of input files, [vpype](https://github.com/abey79/vpype)'s the one most people use.
Going back to really old/simple plotters, there wasn't enough code space to do any optimization. For example, the (fairly terrible) Commodore 1520 roll paper plotter had 2KB of ROM for all the 6502-compatible code its micro-controller used. When I first looked into the [firmware](https://e4aws.silverdr.com/hacks/6500_1/), I was pretty shocked that it printed text by scanning a table of character data from the start every time. Then I realized that even storing pointers for each character would use up about ⅛ of total storage, and the mechanical plotter mechanism was always way behind anything the code could do. So small mattered more than efficient
What are some alternatives?
grblHAL - This repo has moved to a new home https://github.com/grblHAL
GRBL-Pendant-with-LCD - Arduino UNO or MEGA Pendant with LCD for GRBL 1.1f (Jog X Y Z and send any Command while connected to PC simultaneously)
cncjs - A web-based interface for CNC milling controller running Grbl, Marlin, Smoothieware, or TinyG.
meerk40t - Hackable Laser software for the K40 Stock-LIHUIYU laser boards.
ODrive - High performance motor control
vpype - The Swiss-Army-knife command-line tool for plotter vector graphics.
FastAccelStepper - A high speed stepper library for Atmega 328p (nano), Atmega32u4, Atmega 2560, ESP32, ESP32S2 and Atmel SAM Due
laserinterface - The touchscreen UI for for an embedded Rapberry pi in GRBL lasercutters.
printNC - 100% Free and Open Source, the PrintNC is the next generation of high performance, affordable CNC machines
GRBL-Plotter - A GCode sender (not only for lasers or plotters) for up to two GRBL controller. SVG, DXF, HPGL import. 6 axis DRO.
DIY-CNC-machine - How to build your own CNC machine from scratch