Hello,
sorry that this question remained unanswered for so long.
You can do this with the tool Pages per sheet. It is in the PDF24 Toolbox and also online: https://tools.pdf24.org/en/pages-per-sheet
It places several pages of a PDF on one larger sheet, row by row from the top left. Each page is scaled to fit its place on the sheet. To keep the A4 pages at their original size, which matters for projecting, choose the Page size that matches the number of pages:
- 2 pages per sheet (2 side by side): A3
- 4 pages per sheet (2 × 2): A2
- 8 pages per sheet (4 × 2): A1
- 16 pages per sheet (4 × 4): A0
Set Margins to 0 and leave Add borders unticked.
Please note the limits: there are only these fixed grids, at most 16 pages per sheet and A0. If the pages of your pattern have overlap or glue margins, these stay on the pages, so the parts will not line up exactly. A free grid and cutting off the overlap are not possible at the moment. Thank you for the suggestion, we will add it to our list.