Can FTD resin with 0.5% shrinkage be used as Peachy Juice?

[mike_biddell]

After reading the forum I think current resin that is going to be used for Peachy Juice can have shrinkage up to 8%. That's a lot, especially on larger prints. I wonder, did anybody tried with current Peachy prototype FTD resin? I do not know about its surface tension, but its viscosity seems to be similar to MakerJuice G+ resin. Its cost seems to be reasonable, €45 per kg (almost 1L). By the way, what is acceptable surface tension for Peachy Printer? For example, MakerJuice G+ resin have 36.5 dyn/cm surface tension.

The reason I ask is because I'm considering to preorder Peachy Printer, but I feel hesitant to preorder Peachy Juice because of its extreme shrinkage. I realize that it can be partially compensated by software, but I think that using a resin with more than order of magnitude less shrinkage could improve print quality, especially for prints that are not small.

So my question is, will be I able to use third-party resin as "Peachy Juice", assuming its surface tension is within acceptable range? Clearly, this may require somewhat different calibration and settings, so in order for this to be possible software needs to allow to make necessary adjustments.

Also, it may be worth considering to officially reselling different resins as more than one kind of Peachy Juice (so they could be used out-of-the-box by more people), it's not just about shrinkage, resins can also differ in flexibility, temperatures they can withstand after curing, etc. Some UV-curable resins can be used to make high-temp resistant parts or even molds for metal casting.

I have become increasingly convinced that the surface tension can be mitigated by floating a 'thin' layer of pure water on top of the resin. So you have brine in the normal way, then resin and then on top of the resin, say 0.5 cm of pure water i.e. 3 layers.

[/dev/null]

my guess would be that it could be possible to use ANY UV setting liquid resin, just might have to play with the beam speeds during the print if te resin is slower curing than the peachy juice

Thanks, I'm glad to hear that trying out other resins should be possible.

But was there any reason to choose resin with 8% shrinkage for Paechy Juice? I guess higher the surface tension, worse the resolution and quality will be. So, it would be nice to know what's the surface tension of current Peachy Juice in dyn/cm? At the moment I have no idea if official Peachy Juice is just typical resin or is it a resin with exceptionally low surface tension. If somebody could answer this I would be very grateful.

I have become increasingly convinced that the surface tension can be mitigated by floating a 'thin' layer of pure water on top of the resin. So you have brine in the normal way, then resin and then on top of the resin, say 0.5 cm of pure water i.e. 3 layers.

This is interesting idea, but probably software will need to take refraction into account to prevent precision loss. Some loss of precision may still happen, but if surface tension was causing more problems, overall precision may improve (or may become worse, it is hard to tell without experimenting).