Search found 9 matches

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by klambson
Mon Mar 30, 2015 10:19 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Re: FEP vat challenge

New FEP in old, resin-coated PVC rings. No degeneration to PVC that I can tell; perhaps I'm just lucky?
by klambson
Wed Mar 04, 2015 3:02 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Re: FEP vat challenge

Well crikeys. That could be a deal killer, so I'll look into a treatment or alternative approach. Really, the gasketed/bolted rings could still be pvc, as they don't come into routine contact with PVC. The tension ring is exposed on one side and half of the bottom edge. Any suggestions on surface co...
by klambson
Wed Mar 04, 2015 2:53 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Round PVC vat disadvantages

I forgot to mention one drawback to using the materials that I proposed. Because the PVC pipe isn't transparent, you can't readily judge progress or success until later in the print. If the tension ring was shorter, you'd get visibility earlier, but you could give up uniformity in the tension on the...
by klambson
Tue Mar 03, 2015 10:16 pm
Forum: Resins
Topic: Post-Cure part warping
Replies: 0
Views: 3410

Post-Cure part warping

I pulled perfectly flat parts (printed in Makerjuice G+) off my printer a week ago. They sat a few hours in Isopropyl Alcohol. A few weeks later they are warped. Minor UV post-cure...thoughts?
by klambson
Tue Mar 03, 2015 4:00 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Re: FEP vat challenge

Putting the FEP under tension seems to accomplish a few things in my design: 1. It helps form a seal. Most of the resin never makes it to the outer gasket because the FEP is stretched tight by a rounded tension ring. This is reassuring when 20 bucks in resin hovers over a $500 projector. 2. Wrinkles...
by klambson
Mon Mar 02, 2015 9:55 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Re: FEP vat challenge

Thanks Henry. Something I forgot to mention (and apologies to anyone to whom this may have occurred earlier)... If you want to quantify vat/FEP tension, use a tool that indicates frequency . I used a drum-tuning app for my smart phone (guitar tuners don't work). Since we've essentially constructed a...
by klambson
Mon Mar 02, 2015 12:25 pm
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

Re: FEP vat challenge

The projector: Acer's H6510BD. For 100 micron layers, exposure set to 7500ms with the exception of the first two layers, and those get 20 second burns. A note about the one-part silicone sealant as a gasket material: It needs to be trimmed so the edge is slightly less than flush because as the tensi...
by klambson
Mon Mar 02, 2015 1:19 am
Forum: Vat Design and Construction
Topic: FEP vat challenge
Replies: 22
Views: 28477

My answer to the FEP vat challenge

Hello, I've attached a diagram of the flexvat I've built with the material HTL sent me. Before I get into the details, my gratitude and hat-tip to that gentleman...he's been very generous in his contributions to help further the DLP printing revolution. The graphic and pix should explain most of it....
by klambson
Wed Dec 03, 2014 3:35 pm
Forum: Commerical Machines
Topic: Solus High Resolution DLP 3D Printer
Replies: 41
Views: 40391

Re: Solus High Resolution DLP 3D Printer

Love the design, and the quality output of the Solus is incredible. Question: how is it that stray light hitting the mirror isn't a problem?
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