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Build Your Own SLA/SLS • procedure for establishing exposure times for new resin
Page 1 of 1

procedure for establishing exposure times for new resin

Posted: Sun Jan 08, 2017 9:41 am
by jon_bondy
Is there a FAQ somewhere that outlines a procedure for figuring out the correct exposure time for a new resin?

Re: procedure for establishing exposure times for new resin

Posted: Sun Jan 08, 2017 2:47 pm
by radi2k
Hi!

Check those instructables which can be adapted to your needs:
http://www.instructables.com/id/How-to- ... /?ALLSTEPS
http://www.instructables.com/id/How-to- ... /?ALLSTEPS

cheers,
radi2k

Re: procedure for establishing exposure times for new resin

Posted: Mon Jan 09, 2017 12:40 pm
by goopyplastic
The main things I do are to use the calibration cube stl I link off my support page.
I increase the cure time until the smallest column stands up on its own.

You can also use the piece to check how appropriate the resin / blocker is but checking for fillets where the columns attach to the body of the cube.

Re: procedure for establishing exposure times for new resin

Posted: Mon Jan 09, 2017 1:39 pm
by sechsteelement
Hallo,

@ goopyplastic, where I can find your support page?

Best Regards,
M.

Re: procedure for establishing exposure times for new resin

Posted: Mon Jan 09, 2017 5:40 pm
by goopyplastic

Re: procedure for establishing exposure times for new resin

Posted: Sat Jan 14, 2017 7:04 pm
by cew
Another simple quick way to set the base exposure with a new resin or pigment is as follows:

Use the calibrationgrid.stl from http://www.littlerp.com/?page_id=55 Start with the recommended exposure settings. Check via the mirror the build platform is sitting flat on the dish. Print a few layers and have a look at the build platform:

If there is nothing on the build platform increase the exposure 150 - 200%
If there is some xy bleed on the build platform around the spots decrease exposure by 20-30%
If only the central spots are printing boost the exposure by about 15-20%

Also when scraping the dots off the build platform they should 'pop off' :

If they slide off too easily boost exposure by about 15-20%
If they are difficult to scrape off decrease about 15-20%

This only takes a few minutes.

Once this is done the upper exposure levels can then be fine tuned using the calibration cube as goopyplastic suggests above.