Hi,

In Odoo 17, it is not directly possible to print two different paper formats (like A4 and 3-inch receipt) using the same QWeb report template ID without additional customization. 

This is because each report in Odoo is tightly linked to a single paper format through its report definition in XML.

* Use the Same Template Logic, but Define Two Reports

You define two reports with different report_name and paperformat_id, but reuse the same report.template_id.

1- A4 report action

<record id="action_report_A4" model="ir.actions.report">
    <field name="name">A4 report</field>
    <field name="model">model.model</field>
    <field name="report_type">qweb-pdf</field>
    <field name="report_name">module.report_template_id</field>
    <field name="report_file">module.report_template_id</field>
    <field name="paperformat_id" ref="module.paperformat_a4_paper_format"/>
    <field name="binding_type">report</field>
</record>

2-  3 inch report action

<record id="action_report_3_inch" model="ir.actions.report">
    <field name="name">3 in report</field>
    <field name="model">model.model</field>
    <field name="report_type">qweb-pdf</field>
    <field name="report_name">module.report_template_id</field>
    <field name="report_file">module.report_template_id</field>
    <field name="paperformat_id" ref="module.paperformat_3_inch_paper_format"/>
    <field name="binding_type">report</field>
</record>

After adding the 2 report actions, from your model, you can call the actions based on the condition

 def print_report(self):

    if a4_condition:
        return self.env.ref('module.action_report_A4').report_action(self, data=data)
    else:
        return self.env.ref('module.action_report_3_inch').report_action(self, data=data)

Hope it helps.