Printing Instructions

STL files can be downloaded for free from Thingiverse

If you don't own a 3d printer you can have these parts printed for you locally through 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

Print time: ~4h

The Thigh

Print time: ~5h

The Ligaments

Anterior Collateral Ligament (ACL)

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

Print time: ~1h

Posterior Collateral Ligament (PCL)

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

Print time: ~1h

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. 

Print time: ~30m

Medial Collateral Ligament (MCL) 

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

Print time: ~20m

The Plates


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

Print time: ~2h


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

Print time: ~40m

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.

Print time: ~15m

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 Aug 02, 2020.