Stepper motor and controller LEGO + DUPLO connectors

prusaprinters

<p>Connectors with LEGO and DUPLO compatible studs for mounting a stepper motor (28BYJ-48) using 8mm M3 pan head screws and nuts - plus a connector for the ULN2003 motor controller.</p><p>The connectors can be used:</p><ul><li>either to build simple test beds for developing control code with (say) a Raspberry Pi or a simpler microcontroller like the ESP32, or</li><li>for building complete LEGO constructs with ‘mechatronic’ moving parts.</li></ul><p>More detailed context when used with a Raspberry Pi Maker Kit PCB assembly is available at <a href="https://onlinedevices.co.uk/RPi+Maker+Kit+-+Stepper+Motor+control"><strong>this link</strong></a>.</p><p>All the components use 1.75mm PLA and a layer height of 0.15mm with print details for each component produced on an i3 Mk3 shown in the table below.</p><p>Where ‘needs support’ is shown in the table this means that ‘support enforcers’ slabs are added, as shown with a pair of indicative images for the <i>motor_housing_vertical_DUPLO_adaptor02_rotx90.stl </i>object, where support is only applied for the 'enforcers'.</p><figure class="table"><table><tbody><tr><td><strong>component file name/description</strong></td><td style="text-align:center;width:70px;"><strong>needs support (Y/N)</strong></td><td style="text-align:center;width:60px;"><strong>brim (mm)</strong></td><td style="text-align:center;width:85px;"><strong>filament&nbsp;</strong><br><strong>length (m)</strong></td><td style="text-align:center;width:70px;"><strong>print time&nbsp;</strong><br><strong>(i3 Mk3)</strong></td></tr><tr><td><i>motor_housing_vertical_LEGO_adaptor04_rotx90.stl:</i> LEGO connector that mounts the motor drive shaft horizontally. Updated 31st Jul '21 to rotate the hex nut openings by 30 degrees</td><td style="text-align:center;">Y</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">5.11</td><td style="text-align:center;width:70px;">2h 59m</td></tr><tr><td><i>motor_housing_horizontal_LEGO_adaptor02.stl: &nbsp;LEGO connector that mounts the motor drive shaft vertically</i></td><td style="text-align:center;">Y</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">3.11</td><td style="text-align:center;width:70px;">1h 10m</td></tr><tr><td><i>motor_drive_LEGO_adaptor02_repaired.stl</i>: LEGO connector that fits onto the drive shaft</td><td style="text-align:center;">Y</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">0.59</td><td style="text-align:center;width:70px;">21m</td></tr><tr><td>motor_housing_horizontal_DUPLO_adaptor01.stl: DUPL<i>O connector that mounts the motor drive shaft vertically</i></td><td style="text-align:center;">Y</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">5.45</td><td style="text-align:center;width:70px;">2h 11m</td></tr><tr><td><i>motor_housing_vertical_DUPLO_adaptor02_rotx90.stl:</i> DUPLO connector that mounts the motor drive shaft horizontally. Updated 31st Jul '21 to rotate the hex nut openings by 30 degrees</td><td style="text-align:center;">Y</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">12.36</td><td style="text-align:center;width:70px;">5h 30m</td></tr><tr><td><i>ULN2003_LEGO_connector01.stl:</i> LEGO connector for the ULN2003 motor controller</td><td style="text-align:center;">N</td><td style="text-align:center;width:60px;">5</td><td style="text-align:center;width:85px;">1.33</td><td style="text-align:center;width:70px;">35m</td></tr></tbody></table></figure>