One of the most common annoyances we see in our pack is accidentally placing your offhand held item (commonly shields) in the Melter. Placing the item causes it to start consuming ember and can easily lock up a processing system with very little indication as to why since it looks like it is working correctly.

Add Rod stamp recipes to the stamper. Here are the stamp sprites we use in our modpack for the recipes. I also included EnderIO grinding ball stamp sprites if you would like them.
stamp_sprites.zip

Thank you for providing some textures.

Now Rod recipes are added once a mod add the item in the first place.

Grinding Ball recipes are added when enderio and tconstruct are present (it needs tinkers to register the fluids) I also added support for the endergy alloys.
furthermore there are config options to tweak the amount of fluid needed to make rods / grinding balls for balancing purposes in modpacks.

last thing: the melter only takes items from the main hand and ignores everything you have in the off hand.