Made my sister some custom Wax Seal Stamps for her business with a few of her different logos. I've included a Solidworks file of the ‘Stamp Cap’ that you can edit and customize with your logo or letters. Box has room for 3 stamps and 1 handle. Stamps use bolt and thread for quick swapping. Cap covers the socket head bolt. Use a 0.2mm nozzle for best results.
Hardware required:
M5 20mm Socket Head
M5 Nut
M5x8x7mm Threaded insert
Tip when using Stamp: Set the tool in a shallow cup with ice and water before using on the hot wax. This will help cool the wax and allow the plastic to not melt. I used PLA and have not had any issues.