STL files can be downloaded from Thingiverse

If you don't own a 3d printer you can have these parts printed for you using a low-cost 3d printing service such as 3DHubs.

Print settings may vary between printer and type of filament used, but in general you should be safe with the following settings:

  • 20% infill / 1.5mm retraction
  • 2 shells
  • 80mm/s print speed 
  • 0.20mm layer height / 0.4mm nozzle

A Taxonomy of Parts

All of the parts have been given pseudo-anatomical names, which helps by making them easy to organize and refer to.  

Below is an explanation of each printed part that goes into making a Humble Velocipede.


The Shin

Much like your own shin, the shin of the Humble Velocipede forms the lower part of its leg.

The Thigh

The thigh forms the upper part of the leg and is the main connection point for the hip and many of the ligaments.

The Ligaments

Anterior Collateral Ligament (ACL)

The ACL connects the Shin to the Thigh, and is the most visible of all the ligaments.

Posterior Collateral Ligament (PCL)

The PCL serves as the connection point between the shin assembly and the hip shafts. 

Lateral Collateral Ligament (LCL)

The LCL is the longest of the ligaments. It connects the intersection of the Shin and the PCL to the crankshaft. 

Medial Collateral Ligament (MCL) 

The MCL is the smallest ligament. It connects the top of the thigh to the crankshaft. 

The Plates


These four plates form the central part of the skeleton of a Humble Velocipede. 


The endplates act like bookends which capture the hipshafts and protect the internal mechanism. 

Top bar

The top bar is the key to finishing any Humble Velocipede. This bar acts as a spinal column to hold the rest of skeleton perfectly rigid. This version twists 90 degrees once inserted through the plates to lock everything into place.

Prepare the Thigh Assembly

After printing all the parts, the Thigh, MCL, and ACL will need to be put together in preparation for assembly.

Make sure that the MCL (the shorter of the two ligaments) is always oriented in the same direction!

This guide was first published on Jun 30, 2017. It was last updated on Jun 30, 2017.

This page (Printing Instructions) was last updated on Jun 21, 2017.

Text editor powered by tinymce.