I'm testing a new material for the pdms I asked for a suggestion for an expert in plastics, in order to establish a transparent material with a Shore hardness between 40 and 60 similar to sylgard, but with greater resistance to UV. He told me to try it with a transparent polyurethane resin called "PUE 182T "see: http://www.poolkemie.it/prodotti/resine-poliuretaniche/resina-trasparente This resin is more transparent than the sylgard and when is exposed to the UV ray became more transparent!
I re coated the vat with 50 gr of PUE182T, (may be is too much, because pdms thickness after curing is 2,8mm) but the result was great it's look more transparent than sylgard with the same gums consistences.
I tried two print with 30xy 25 z cherry resin default parameters and the first slices of the round model bases remained attached to the pdms, could be happen this because the pdms material is different or I have to change the print parameter? May be over cured?
In order to improve the model adhesion, i drilled my build table with 1,2 mm holes at 0.6 mm of distance one each other.
I wonder is it possible start the print with the build table completely downed on the pdms plane? how can set the soft for do it? This is because the resin is cured in the holes of the build table, has a higher tear strength! This could be a solution to many attachment problems or not? what do you think about? May I go head with this experiments or I'm in totally wrong way because the material is no suitable for the purpose? Have you ever tried such a thing?
Many thanks SERGIO