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This is a hack that enables the use of any regular flashlight as a bike light. Made for CycleHack 2017 - Lisbon (https://cyclehacklisboa.tumblr.com/).

Barrier This Solves: Reuse regular flashlight's to improve bike safety.

Step 1: measure the flashlight's diameter and your bike handlebar

Step 2: edit the OpenScad file and generate the STL file

Step 3: call a friend with a 3d printer or go to the nearest Makerspace/Fablab

Step 4: with 4 zip ties firmly secure it to your bike!

Step 5: Ride you bike safely.

This is similar to https://www.thingiverse.com/thing:250899

I've clean the OpenScad code and now it supports various zip ties and dimensions. Use the OpenScad file for your hack.

Happy CycleHacking!

Materials and methods

infill: 20%

res.: 0.2mm

OpenSCAD code

// Author: Tiago Charters de Azevedo
// Maintainer: Tiago Charters de Azevedo
// URL: http://diale.org/
// Version: *

// Copyright (c) Tiago Charters de Azevedo

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3, or (at your option)
// any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.

// Commentary:

$fn=64;
phi=(1+sqrt(5))/2;
dflasglight=24;
dbar=22.34;


zip=6; //Width of your zip tie.
height=max(25,dbar,dflasglight);


module holder(){
    difference(){
        cube([dbar+zip, dflasglight+zip, height],center=true);
        translate([0,0,height/phi]) rotate([0,90,0]){
            cylinder(r=dflasglight/2, h=1.1*(dbar+zip), center=true);}
        translate([0,0,-height/phi]) rotate([90,90,0]){
            cylinder(r=dbar/2, h=1.1*(dflasglight+zip), center=true);}}}

module ziptietop(){
    translate([0,0,height/phi]){
        rotate([0,90,0]){
            difference(){
                cylinder(r=dflasglight/2+zip, h=zip, center=true);
                cylinder(r=dflasglight/2+zip/2, h=dbar+20, center=true);}}}}

module ziptiebottom(){
    translate([0,0,-height/phi]){
        rotate([90,90,0]){
            difference(){
                cylinder(r=dbar/2+zip, h=zip, center=true);
                cylinder(r=dbar/2+zip/2, h=1.1*(dbar+zip), center=true);}}}}

translate([0,0,(dbar+zip)/2]){
    rotate([0,0,0])
    difference(){
        holder();
        translate([(dbar+zip/2)/4,0,0]){
            ziptietop();}
        translate([-(dbar+zip/2)/4,0,0]){
            ziptietop();}
        translate([0,(dflasglight+zip/2)/4,0]){
            ziptiebottom();}
        translate([0,-(dflasglight+zip/2)/4,0]){
            ziptiebottom();}}}

Pics

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For attribution, please cite this page as:

Charters, T., "3D printed bike flashlight mount": https://nexp.pt/bikehack.html (23-01-2025 [00:03])

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(cc-by-sa) Tiago Charters - tiagocharters@nexp.pt