I recently had some time to revisit my mini letterpress project. After using the earlier design for awhile, I wanted to redesign the press to eliminate all 3D printed parts and make it out of metal for increased strength. This press can be made out of MDF or Aluminum with a few quick dimension changes. The files attached are for 5mm thick aluminium sheet. Almost of of the parts can be cut with a laser cutter/waterjet/cnc, although I did use a lathe to make the wood handles and the top cross bar. All dimensions are in mm since I have recently moved to Sweden.
320mm x 290mm x 5mm aluminum sheet
30 mm x 30mm x 300mm block of wood for turning handles
10 Cap nuts - (McMaster source)
1/4"-20 All thread rod
Thin MDF to make printing plates
Any type of thick paper or card stock, I prefer cotton paper
Printing ink, I tried aqua-LINOPRINT. It dried a bit too fast but was easy to clean up.
Brayer to roll the ink
Acrylic or glass plate to spread the ink
1/4" Allen key