Uploaded April 2021 | Updated September 2026, 2 weeks ago
In this video I show you how to make 3 silicone rubber molds using 3 different methods.
What these parts have in common is that they all have holes.
The first mold is the simplest. It's a 1-piece cut mold using a plastic cup as a mold case. This probably the most common mold I make because it's quick, easy and works with most small parts.
The second mold is a 2-piece mold with a flat parting line. The part being cast has screw threads so care must be taken to avoid catching bubbles there. The parting line is created by clamping the part to a waxed wooden base and registration dots made of resin are also attached to the parting surface. This mold is poured in two batches.
The third mold is by far the most complex. It is a hybrid mold using both clay-up and cut mold strategies. It has a long through hole which requires a clay-up parting line in the middle. It has a thin, flat flange and screw threads. This require multiple air vents and cut parting lines that run at 90 degree to each other.
TIMESTAMPS
00:00 Silicone mold making three different ways.
00.38 How to deal with holes in models.
04:03 Setting up a cut mold in a cup.
05:51 Testing the rubber to verify that it will cure.
12:06 Sealing the mold case parts with beeswax.
13:23 Registration dots on mold cases.
15:15 Pouring molds; using mold release on 2-part molds.
20:02 Spruing and venting a complex part.
22:23 Pouring on open mold of a model with threads.
25:12 Pouring the 2nd half of a 2-part mold.
29:09 Pour rubber around a complex shape.
Here is a list of suppliers for the rubber, resins and waxes I use in my videos: dropbox.com/s/kz6mhmf7v5vpy7l/Material%20and%20Suppliers.pdf?dl=0
Do you have a project to suggest for the channel? Here’s a .pdf with everything you need to know: dropbox.com/s/pjb0l6fr7zjttec/YouTube%20Collaboration.pdf?dl=0
In this video I show you how to make 3 silicone rubber molds using 3 different methods.
What these parts have in common is that they all have holes.
The first mold is the simplest. It's a 1-piece cut mold using a plastic cup as a mold case. This probably the most common mold I make because it's quick, easy and works with most small parts.
The second mold is a 2-piece mold with a flat parting line. The part being cast has screw threads so care must be taken to avoid catching bubbles there. The parting line is created by clamping the part to a waxed wooden base and registration dots made of resin are also attached to the parting surface. This mold is poured in two batches.
The third mold is by far the most complex. It is a hybrid mold using both clay-up and cut mold strategies. It has a long through hole which requires a clay-up parting line in the middle. It has a thin, flat flange and screw threads. This require multiple air vents and cut parting lines that run at 90 degree to each other.
TIMESTAMPS
00:00 Silicone mold making three different ways.
00.38 How to deal with holes in models.
04:03 Setting up a cut mold in a cup.
05:51 Testing the rubber to verify that it will cure.
12:06 Sealing the mold case parts with beeswax.
13:23 Registration dots on mold cases.
15:15 Pouring molds; using mold release on 2-part molds.
20:02 Spruing and venting a complex part.
22:23 Pouring on open mold of a model with threads.
25:12 Pouring the 2nd half of a 2-part mold.
29:09 Pour rubber around a complex shape.
Here is a list of suppliers for the rubber, resins and waxes I use in my videos: dropbox.com/s/kz6mhmf7v5vpy7l/Material%20and%20Suppliers.pdf?dl=0
Do you have a project to suggest for the channel? Here’s a .pdf with everything you need to know: dropbox.com/s/pjb0l6fr7zjttec/YouTube%20Collaboration.pdf?dl=0
