Years ago when I was living in Auckland I went to a creative class how to make my own stamps. These are not them, but I do have them somewhere. I needed a stamp recently, so I hunted out some kids rubbers and made my own.
Trace or draw the desired shape on the rubber
Cut around the outline with a craft knife
Cut a grid pattern around the desired shape
Run craft knife along the side, undercutting the grid pattern, released pieces with fall away.
Tidy up the pieces of rubber which the grid pattern did not release.
So that was how I did it back in 2014, this year I made my own rubber mix (see below for details) very easy I assure you.
The original item on the left in both pictures is a wood torso, this was used to indent the thin sheet of red sponge (I bought, from a variety store $3 for 10 sheets). Then I inked and marked the outline on the homemade rubber and remove the rubber I did want. I did not really have the best tools, I could have done with a fine lino cutter but they kind of did the trick you get the idea..
Rubber Mould recipe
1 tube of silicon (I use parfix brand)
9th March 2014
12th Jan 2019