Open-source & Modifications

Last Update: 28 July 2020

The LongMill project is at its core an open-source project. Many of its design choices, from sourcing as many off the shelf parts as possible to our choice in CAD software, comes down to making this project as replicable and well-supported as possible.

We believe that by making this design open-source, we will be able to drive the CNC community forward through sharing and improving CNC technology. The idea is for:

  • Users to modify and improve their machines to fit their needs
  • Machine owners to share their designs with the community to help others that have similar needs
  • Makers to use our design ideas and design philosophy to create other types of machines, such as laser cutters, plasma cutters, and 3D printers
  • Us to gain inspiration from the community to help us guide our development of current and future products and features

This is accomplished by putting under a Creative Commons BY-SA license:

  • The entire mechanical design of our LongMills Benchtop CNC available in a range of 3D file types and as drawings where applicable
  • Any internal assembly jigs and other supporting hardware for the LongMill
  • Documentation of general manufacturing techniques used to produce the LongMills various custom components including general 3D printing settings
  • All educational information provided within the LongMill Resources area including machine assembly instructions and modifications
  • The mechanical BOM which documents all the components required to build a LongMill
  • Every aspect of the electrical design behind our custom LongBoard CNC controller including BOM, schematics, gerber file, etc.

and by sharing the LongMills modified firmware profile, a small modification of the GRBL open-source project, under the GPLv3 license just as the original project is.

All this information is continually updated as the LongMill project continues to be revised, with more openly shared shared information being made available at each new major revision and licensing continuing to be applied to all previous major versions. By making this information available, the LongMill project fulfills the Open Source Hardware Association’s definition of open source hardware, and we think that’s pretty cool 🙂

Documentation

The LongMill has gone through two major iterations of its design: V1 was our Kickstarter batch which was shipped from September 2019 to mid-January 2020 and V2 came with some additional improvements and began shipping March 2020. These changes were mostly process/QA related or were fixes that we implemented to make assembly and packaging easier on our end. The only noticeable improvements made for the end user is the steel vs. plastic ‘arm’ (which really only comes into play during assembly), the longer motor cables, the improved control box (where the primary improvement is the ability to now fasten it down easily), a new LongMill wrench shipped with the machine and better hole clearances.

You can find the designs of every part and assembly of every version of the LongMill Benchtop CNC in the linked Onshape documents below:

Version 1: https://cad.onshape.com/documents/c671532d980f277a13d1ace4/w/95c27aef1c0bb10a840ac8bd/e/c456cde929694e3c560d6883

Version 2: https://cad.onshape.com/documents/07e5303fe93ccde67c101960/w/c7cd5aa0b4420ce125d689ab/e/21328c5ee482d0f23caa87aa

Current BOM:  https://docs.google.com/spreadsheets/d/1o4196MmMsYC8ZL_g6McnO9MoaPllH6LNCJlDifFEhhk/edit?usp=sharing

LongBoard CNC Controller

The LongBoard CNC Controller the control system and brains of the LongMill. This board was designed by our friend Chris Hadjuk and the Sienci Labs team with KiCAD. Gerber, assembly, schematic, and BOM files can be found on the zip file below.

TB6600-Driver-Carrier (Dec 26, 2019)

3D Printing

To read more about our print settings to help you print your own parts, read this post here: https://sienci.com/2019/11/11/3d-printing-settings-for-longmill-parts/

STL files can be directly downloaded from the Onshape document. You may need to make an account to download STL files.

Modifications

If there are any known noteworthy designs or modifications made to the LongMill, they will be posted here. This is to make the information needed for modification more accessible and to also thank and recognize users and community members who have made an impact on the LongMill CNC project.