MANUFACTURING – 3D PRINTING (REIN LA/MLA/DLP) CALCULATOR
Hollow Wall Thickness
A precise tool.
What is the Hollow Wall Thickness & How does it work?
In resin‑based SLA, MSLA, and DLP printing the liquid photopolymer must be able to flow out of internal cavities while each layer cures. A hollow wall provides a channel for uncured resin to drain, preventing voids and ensuring dimensional accuracy.
The wall thickness of a cylindrical hollow part can be derived from simple geometry. If Douter is the external diameter and Dinner the internal diameter, the uniform wall thickness t is:
This relationship assumes a perfectly concentric wall and neglects any post‑processing shrinkage.
When selecting a wall thickness for drainage, designers must balance structural strength against the minimum channel size required for the resin’s viscosity. Thicker walls increase rigidity but may reduce the effective flow area, while walls that are too thin risk cracking during handling or post‑cure cleaning.
\frac{D_{outer} – D_{inner}}{2}
t = wall thickness (mm)
Parameters
Result
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Frequently Asked Questions
How do I calculate the wall thickness for a cylindrical hollow part?
To calculate the wall thickness, subtract the internal diameter from the external diameter and divide by 2.
Why is wall thickness important in resin-based printing?
Wall thickness is crucial as it allows uncured resin to drain out of internal cavities, preventing voids and ensuring dimensional accuracy during curing.
Can this formula be used for non-cylindrical shapes?
This specific formula is designed for cylindrical hollow parts. For other shapes, different geometric calculations would apply.
What happens if the wall thickness is too thin in resin printing?
A wall that is too thin can lead to voids and dimensional inaccuracies as uncured resin may not drain properly during curing.
Is there a minimum recommended wall thickness for resin prints?
While there’s no strict minimum, a general guideline is to maintain a wall thickness of at least 0.5mm to ensure proper drainage and accuracy.
How does wall thickness affect the curing time in resin printing?
Thicker walls may require longer curing times as more resin needs to cure throughout the part, while thinner walls can cure faster.
Can I adjust the wall thickness during the 3D design phase?
Yes, you can modify the wall thickness in your 3D design software before printing to achieve the desired dimensions and quality.
Results are for informational purposes only and do not constitute professional advice.