This is a small printing press for making gift tags and business card sized prints. The useful printing area is 3.5in by 2 in. To make plates you just need to make a 3.5"x2" plate a few mm thick, sketch out your design, and extrude it out of the opposite side of the plate by .75 mm or so. I've made a little stand to hold the platten and the plates upside down for easy inking and to keep them from making a mess when you're working with multiple plates for a multicolor print. The easiest way to keep from getting ink on the plates when you roll them out with a brayer is to include a small border around the design but sometimes that's not feasible or desirable so I also included a small frame to go around a plate that the brayer can run along and keep things clean.

Printing is pretty straight forward, no supports needed, all the pieces print on a 6in bed easily.
You will need to print 2 end plates, 2 side plates, 2 levers, 1 print bed, and 1 block. I would recommend a pretty high infill on the levers, 50% or higher. I've included a test print knob to test fit the holes and pegs so you can scale it up or down a hair before printing the entire press.

All the parts are held together with a 1-foot piece of all thread cut into thirds. I used 3/8 threaded rod because I had it on hand, but 1/4 would be fine. On the top of the print bed, I cut a small piece of EVA foam to allow some squish and get some emboss on the paper.

To make a print you're going to need a brayer and some ink. You'll need to take a brayer and roll out some ink in a very thin sheet on something very flat like a piece of glass. With your plate stuck to the block with double sided tape and the block in the inkstand, you'll roll across the tops of the raised sections from at least 2 sides. Take some thick heavyweight paper cut to about 3.5"x2" and slide it into a small dish of water for a few seconds, then lay it in the bottom of the press. Insert the block into the press and bear down on the levers with a pretty heavy force for a few seconds. Release the levers and pull out the block.

These are all the supplies needed to get started, most of it should be available locally for cheaper.
water-based inks: https://www.amazon.com/Speedball-Water-Soluble-Block-Printing-Starter/dp/B000J09PFM/ref=sr_1_3?keywords=printing+ink&qid=1562435047&s=gateway&sr=8-3
4in brayer: https://www.amazon.com/Cosmos-4-Inch-Rubber-Printmaking-application/dp/B01EA796NK/ref=pd_cp_201_3?pd_rd_w=uDsNc&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=PGKKQWSB8X8MR5Z8QMFK&pd_rd_r=c7578635-a015-11e9-a94e-716468749152&pd_rd_wg=zx7Uq&pd_rd_i=B01EA796NK&refRID=PGKKQWSB8X8MR5Z8QMFK&th=1
1/4 threaded rod: https://www.amazon.com/Forney-49689-Galvanized-All-Thread-Rod/dp/B003X3W2AM/ref=sr_1_8?keywords=1%2F4+in+threaded+rod&qid=1562436076&s=gateway&sr=8-8
1/4 in washers:https://www.amazon.com/Steel-Washer-Plain-Finish-B18-22-1/dp/B009OJIH7G/ref=sr_1_8?keywords=1%2F4+in+washers&qid=1562436108&s=gateway&sr=8-8
1/4in nuts: https://www.amazon.com/Hillman-150003-Coarse-20-Inch-100-Pack/dp/B000BPEPNW/ref=sr_1_8?keywords=1%2F4+in+nuts&qid=1562436129&s=gateway&sr=8-8
EVA foam: https://www.amazon.com/Foamies-Foam-Sheet-Royal-inches/dp/B005M2RIO2/ref=sr_1_6?keywords=craft+foam&qid=1562436940&s=gateway&sr=8-6