2020 3018 CNC upgrades with SKR Mini E3 V3.0 running Marlin 2.1.1

thingiverse

This is a remix from Teaching Tech’s Sainsmart Genmitsu 3018 CNC upgrades https://www.thingiverse.com/thing:4740697 https://www.youtube.com/watch?v=Q4TrzshXV10 I have an old 3018 CNC machine lying around unused for years. Today, I decided to bring it back to life. Since I don't want to mess with my Macbook M1 driver. So I need to replace the original GRBL board with a controllable marlin board. ### Here are the differences from his original design - My 3018 CNC machine uses 2020 aluminum extrusion instead of an acrylic frame. - <s>Using SKR Mini E3 V3 instead of discontinued SKR Mini V1.1</s> - Using SKR 1.4 and A4988 drivers - To incorporate this new board, I updated the firmware to Marlin 2.1.1 - Since I’m waiting for a working LCD, so I will have to use raspberry pi 3b to control the device. - Using the original motor provided by the original kit. - For the relay function, <s>I use FAN1(PC7) as Spindle enable pin. And supply 5V and GND from Filament stop pins.</s> see diagram. Using locally sourced single channel relay. Tested working with original 24v spindle motor. - Each part is enclosed in module boxes. And they are all printable with smaller printed beds. ### Shopping list <s>- SKR Mini E3 v3.0 https://s.click.aliexpress.com/e/_DmjuX4F</s> - BTT SKR V1.4 https://s.click.aliexpress.com/e/_DeZkPZD - 5V Single Channel Low-Level Relay https://s.click.aliexpress.com/e/_DENxkkP - 9 M5 10mm Screws https://s.click.aliexpress.com/e/_DBtMUCP - 4 M3 10mm Screws - 4 M3 30mm+ Screws - 4 M2.5 screws for Raspberry Pi Mount - lots of M3 Hex nuts ### Instruction / Assembly <s>- Download the base firmware file https://github.com/bigtreetech/Marlin/tree/SKR-mini-E3-V3.0-G0B1 and replace Configuration files. Motor stepping is still wrong, but it works.</s> - Download Marlin v2.1.1 firmware here https://marlinfw.org/meta/download/ - Replace provided configuration files - Build Firmware file using Vscode auto build marlin - Copy firmware.bin to the root of an SD card. Power on the mainboard then waits 10 seconds to flash the firmware. - Mount SKR on the 2020 aluminum extrusion. Use 4x universal_mount.stl - Mount 12864 screen. https://www.thingiverse.com/thing:5677756 - Print two PSU mounts and slot PSU in from both sides (If you don't need Dremal Mount nor AC relay, you may finish here) - Download and print Dremel mount https://www.thingiverse.com/thing:3938914 - Connect motor/spindle wire as shown on the diagram - For SKR 1.4, see the new diagram ### This is an unfinished project. Currently very bare-bones with exposed wires. Please be extra careful when working with the main voltage. You won't need to print all the stl files Recommended upgrades: - Drag knife and pen mount for CNC 3018 https://www.thingiverse.com/thing:4014528 ### To do - Change motors to closed loop one 16 Nov 2022 - Updated motor setting in firmware. 19 Nov 2022 - Updated SKR / Raspberry Pi case 4 Dec 2022 - Switched to locally sourced SKR v1.4 with standard 12864 LCD -> Mount https://www.thingiverse.com/thing:5677756 Also decided to no longer mount raspberry pi on the machine, since it's hard to work when they are stacking on top of each other. Please buy/print a new case and mount them as desired.