Are you self-employed? If so, list your business printer and computer under office expenses if each cost $2,500 or less. The IRS allows you to write off assets costs up to $2,500 under a de minimis safe harbor threshold. You'll find Office Expenses under Other Common Business Expenses in Profit or Loss from Busness.
If you want, you can also enter them as assets and spread the deduction over time.
Employees are no longer allows to write off unreimbursed work expenses. Some states still allow deductions. If you are an employee you can enter those items as Job-Related Expenses in Deductions & Credits. TurboTax will move eligible expenses over to state.