Yes, your spouse is required to report his self-employment income on your joint return even if it does not seem "worth it" to you. That is the law. If he earned more than $400 by through self-employment he is required to report the income and pay self-employment tax on it for Social Security and Medicare, as well as ordinary income tax.
He can deduct the expenses for his supplies, etc. on a schedule C.
https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes
https://ttlc.intuit.com/questions/2903027-how-do-i-report-income-from-self-employment
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
