Build Your Own SLA/SLS

Makerjuice resin prevents Smooth-On silicone from curing when they touch. Even when very well cured. Does anyone have a good workaround?

I think, you must use condensation-cure silicone. Additition-cure silicones not working with UV resin (sulfur inhibits polimerisation).

Platinum based silicone will inhibit with MakerJuice. Tin based works just fine. We have good success with the High Strength series:
https://www.alumilite.com/store/p/920-A ... gth-2.aspx

I've also found most dlp resins can inhibit platinum cure silicones. However I still use these a lot for rapid prototyping of small silicone components. There are some workarounds that can help:

Overcure the resin as mentioned above. Typically we double the normal UV cure then do a thorough thermal cure.
Clean the mold surface with an isopropyl wipe to remove any surface residue traces and dry
Coat silicone friendly mold release. For example a couple of coats of Mann Ease 200 works well.

Nb the mold surface can also be painted with car acrylic clear coat and heat cured at 60C for a very tough low inhibition surface

Low temperature vulcanising silicone rubber (~75C) eg Castaldo VLT. Not great on delicate parts, but with care gives some good results. Mould release is helpful too - as is the long cure suggestion.

Do not use enamel paint for sealing parts as it will inhibit Platinum based silicone. As long as the UV resin is fully cured (no outgassing) it should work.

Inhibition test with Platinum based silicone, Alumilite

So which is it? Do you need to use a different resin, or do you just have to UV bake MajerJuice prints a little longer?
Also, which silicone are you using? I've been using Sorta-Clear for my projects.

I need to know too, as making molds of my prints is vital to the projects I have in mind.

The guy at the place I go to for molding and casting supplies recommended this for using 3D printed parts as a mold positive:


XTC-3D® is a protective coating for smoothing and finishing 3D printed parts. Two liquids are mixed together and brushed onto any 3D print.

XTC.hero.01Coating self-levels and wets out uniformly without leaving brush strokes. Working time is 10 minutes and cure time is about 4 hours (depending on mass and temperature). XTC-3D® cures to a hard, impact resistant coating that can be sanded, primed and painted. Adding colors and metal effects is easy.

Inexpensive to Use: 1 oz covers 100+ square inches.

90% Time & Labor Savings: XTC-3D® fills in 3D print striations and creates a smooth, high gloss finish. The need to post finish is almost eliminated.

Coat any 3D Print Surface: XTC-3D® can be applied to both SLA and SLS prints. It works with PLA, ABS, Laywoo, Powder Printed Parts and other rigid media. It also can be used to coat EPS, EPDM and urethane foam as well as wood, plaster, fabric, cardboard and paper.

XTC-3D® does not contain VOC’s, phthalates or phosphates.

http://www.reynoldsam.com/new-xtc-3d-pe ... ing-epoxy/
http://www.reynoldsam.com/product/xtc-3d/