Extrusion feet

Generate feet for aluminium extrusions with OpenSCAD.

Prusa i3 hard feet

It is widely accepted that, if using a heavy base (such as a paver stone) for your Prusa i3, it is better to use hard feet that are able to transfer vibrations onto the mass, as opposed to the vibration-dampening stock feet.

I couldn't find any models of hard feet that were fastened with t-nuts, which seemed like the logical choice, given how you want the tightest possible coupling, so I whipped this up in OpenSCAD. Ringing test appears to show minor improvement over Y axis, and the printer seems quieter overall.

The feet have (by default) the ~same height as the stock ones, so clearances aren't an issue.

Build manual

Bill of materials

Item	Quantity
foot	4
M4 3030 T-nut	4
M4x10	4

Quick build

Download the model from printables.com.

Process

0. Print out 4 copies of the foot. I printed mine in TPU with plenty of perimeters.
1. Drill/puncture through the single layer covering the bolt hole.
2. Remove the stock anti-vibration feet.
3. Mount the printed feet with t-nuts onto the bottom of extrusions.

Customizing

You can also customize the feet (for example, make them taller) by cloning the source code and playing with foot.scad. All of the values can also be changed using the OpenSCAD Customizer.

As a OpenSCAD library

Installation

git submodule add https://github.com/mmalecki/extrusion-feet extrusion-feet

Usage

use <extrusion-feet/foot.scad>;
foot_2020();

API

foot(d, slot_w, slot_d, bolt, countersink, t_nut_w, c_h, s_h, hole_cover)

Draw a custom-sized foot.

foot_2020(c_h, s_h, bolt, countersink, hole_cover)

Draw a 2020 extrusion-sized foot.

foot_3030(c_h, s_h, bolt, countersink, hole_cover)

Draw a 3030 extrusion-sized foot.

foot_prusa_i3(bolt, hole_cover)

Draw a Prusa i3-sized foot.