Slack Lack Parametric Magnets

This is a remix of the Slack Lack parts which include magnets to allow parameter settings for the magnet dimensions.

Please note, the STLs included here are blanks, with no magnet insets defined. The blanks were taken from Slack Lack's step files and simply had the existing magnets extruded out.

If you have any issues with magnet alignment or positioning, please let me know. I'm still working on printing all of my parts.

Some guidelines for magnet choices, the max for dimensions is like