The spindles are 3D printed from Polylactic acid (PLA). PLA is derived from renewable resources like cornstarch and tapioca roots and is biodegradable. The only trade off for not sitting in a landfill for future super intelligent apes to find is the glass transition temperature of PLA (temperature where the plastic gets soft) is 60–65 °C. (140-149 °F). So do not keep them in your oven, your car in the summer or anywhere that you would not want to hang out.