Mold for Phrozen Arco silicone hot end sock

Update 27-6-2026:    I have added new outer mold casings with more space to be able to create a thicker, 2mm walled silicone sock. I thought my own test cast was a bit thin walled, so I added the 2 extra files. 




Someone jokingly asked me if I could design a printable silicone sock for the Arco hot end, since these are hard to find locally, while the shipping costs from Taiwan are very high. 

I had some spare time today and drew up a multipart mold so you can "cast" your own silicone socks with high temperature resistant silicone. A quick google search showed many different brands so sourcing some high temperature resistant silicone locally is pretty easy. Just make sure it can withstand at least 300°C 

The "hot end stand in" is made of 3 parts and uses 2 small bits of filament as alignment pins. This should be glued together first, before you can use the mold. When the glue is dry you can use some fine grit sandpaper to smooth the surface of the "stand in hot end" a bit. 

The "hot end template A" needs to be supported, the holes and the space for the dowel in both halves can be printed with bridging, so these areas do not need supports. 

Print settings:

• 4 walls

• 10 top and bottom layers

• Infill use your own preferred variant
  

Apply some mold release agent, something like petroleum jelly, on the "hot end stand in" and on the inside of the 2 halves of the mold. 

Add the second half 

Put the assembly in the bottom part

There are holes on each side to use for filling the mold with your high temperature resistant silicone. These holes also serve as spillover holes so be gentle when you fill the mold! 

Let it all cure for at least 24 hours, but check the instructions on your specific silicone for more details.