Search found 28 matches

by cew
Fri Jun 16, 2017 9:30 pm
Forum: Resins
Topic: Resin thinner
Replies: 1
Views: 2782

Re: Resin thinner

Low viscosity resins are easier for printing high resolution parts and cleaning. I've recently seen some resin thinners available at 3drensyns such as
https://www.3dresyns.com/products/thinn ... d-dilutant

I'll be keen to hear of any experience or advice using these.

Cheers
by cew
Tue Apr 04, 2017 12:15 am
Forum: LittleRP
Topic: Lens modification on Acer P1500
Replies: 3
Views: 4867

Re: Lens modification on Acer P1500

Note there is a useful a lens modification guide for the Acer X1240 at http://imgur.com/a/FOgXW The Acer 6150 and presumably the 1500 are very similar. The specific steps for the 6150 lens modifications include: Once the lens is off and the zoom adjustment screws out. Pull the zoom adjustment ring o...
by cew
Wed Feb 01, 2017 9:33 pm
Forum: LittleRP
Topic: FTD (FunToDo) resins on LittleRP?
Replies: 31
Views: 26770

Re: FTD (FunToDo) resins on LittleRP?

I hope to try out these flexvats with underplates when they become available. Are the prints failing part way (>5mm z axis) into the print? I had a similar experience with divots on taller prints using the B9 black resin. This was solved by boosting the retraction rate to 300 and the lift height to ...
by cew
Sat Jan 14, 2017 7:04 pm
Forum: LittleRP
Topic: procedure for establishing exposure times for new resin
Replies: 5
Views: 4877

Re: procedure for establishing exposure times for new resin

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 ...
by cew
Fri Dec 09, 2016 11:50 pm
Forum: LittleRP
Topic: Lens modification on Acer P1500
Replies: 3
Views: 4867

Re: Lens modification on Acer P1500

Yes the following modifications help particularly at higher resolutions: Lowering the lens about ~2mm helps center the lens for printing and reduces blurring at the top of the image Stepping out the lens ~5mm helps reduce spherical aberration issues across the build platform Zooming down as much as ...
by cew
Sun Nov 27, 2016 5:37 am
Forum: LittleRP
Topic: Increasing resin reactivity during print - fix?
Replies: 7
Views: 9097

Re: Increasing resin reactivity during print - fix?

Another update after a few more months use: High retract rates have helped; improve surface quality, reduce print failures plus 'flaking' on taller prints and improved pdms life. Presumably these help mix the resin similar to wipers used on other printers. Am currently using 5.5 mm lift with 300mm/m...
by cew
Sun Oct 02, 2016 5:28 pm
Forum: LittleRP
Topic: Compatable resins with LittleRP
Replies: 6
Views: 5451

Re: Compatable resins with LittleRP

For molding platinum cure silicones its important to fully cure the resin. This typically involves prolonged UV then a thorough heat cure. There should be no residual smell when the resin is cut. Mold release is also needed - a coat of Mann Ease 200 works well. If the silicone still fails to fully c...
by cew
Sat Sep 17, 2016 6:44 pm
Forum: LittleRP
Topic: Issue with PDMS
Replies: 7
Views: 5154

Re: Issue with PDMS

This looks promising. The method I use for setting 'just enough' exposure across the build platform is: Lower exposure so only the center pegs are printing ok and the outer pegs only partially form. Nb to save time you often only need to print a few layers to see this. Initially you can check via th...
by cew
Sat Sep 17, 2016 4:56 am
Forum: LittleRP
Topic: Issue with PDMS
Replies: 7
Views: 5154

Re: Issue with PDMS

As you say probably too much exposure. Some quick suggestions:

I find the base settings and calibration pegs from the littlerp site useful for setting exposure.

Set it just enough so that all the pegs print across the build platform.

Keep retraction rate high ~200mm/min
by cew
Thu Aug 04, 2016 7:53 pm
Forum: LittleRP
Topic: Considering a LittleRP and have some questions
Replies: 1
Views: 2585

Re: Considering a LittleRP and have some questions

We have a couple of these printers- some answers: 1. Portable? Its best to unscrew the projector. The two parts are reasonably transportable. Then reattach and fine tune the focus which takes about 5 minutes. 2.XD2321 Don't know about this. But its likely to be a lot easier to work with one of the p...