SLA: resin drain holes, added automatically
A hollow part printed in resin keeps liquid resin inside unless it has a way out. This is how much, and what two holes change.
The labels inside the chart are in Serbian. Every value in the chart is repeated in the table below.
The part
A housing with 2 mm walls and a closed interior. The closed cavity holds 125.8 ml, and with it 138 g of liquid resin would stay trapped.
What the tool did
- Found the closed cavity and measured it: 125.8 ml.
- Added two Ø3.5 mm holes: the first as low as possible, close to the build plate, the second as far as possible from the first.
- Measured the hole length through the wall: 1.7 mm and 4.6 mm.
- Checked the result: 0 closed cavities remain, and the mesh is closed and ready for preparation.
Results
| Measure | Value |
|---|---|
| Closed cavity | 125.8 ml |
| Liquid resin that would be trapped | 138 g |
| Holes added | 2 x Ø3.5 mm |
| Hole length through the wall | 1.7 mm and 4.6 mm |
| Closed cavities after drilling | 0 (checked) |
| Mesh after drilling | closed, ready for preparation |
Why two holes
One hole lets the resin out and the other lets air in. With a single hole the resin leaves slowly and unevenly, or not at all. The low hole drains by gravity, and the far hole lets air replace what leaves. The full report includes the STL with the holes already drilled. Sizes and placement for resin, SLS and metal are in the guide on drain and powder escape holes.
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