Cardboard Build Resources

Below are a number of resources to assist you in building a cardboard class robot for KILLSWITCH. If you have questions or requests please drop them in the Mattermost KILLSWITCH Channel!

Chassis Files

Cardboard Class
Basic rectangular Vertical Spinner	.svg file		Fully editable in Inkscape, this file should contain everything you need to laser all the necessary cardboard and baltic birch to complete a full, basic cardboard robot. This was designed around the hardware recommended in the wiki.

Wheel Files

Ready to go beyond the stock Pololu wheels recommended in the sample parts list? How about printing your own custom wheels!

Double O-Ring Version
Hub Check - highly suggested you print one of these and verify shaft fit before printing full wheel(s).
4.40mm shaft diameter (Try on Prusa XL)	.step file	.stl file	This shaft diameter - 4.40mm - seems to work well when printed on the Prusa XL (tested 8/12/25) using PETG material but I'd still advise you to print and test fit a hub check yourself before printing wheels.
Full Wheel - If the shaft size is correct for your application you can download the .stl file and send directly to the printer or download the .step file and edit to your liking!
4.40mm shaft diameter - KILLSWITCH Text	.step file	.stl file	The size of this wheel is comparable to Pololu 80 x 10mm and they use a 5.5mm x 3mm square nut and a 3mm x 10mm (or longer) screw to secure to the motor d-shaft. Sized for 2-1/2" ID, 2-3/4" OD, 1/8" Width O-rings. Many variations of these exist, this is just one. Try different materials and share what works best for you!